Reader Reports: (later reports first.) If you've upgraded your Mini's CPU, send a report.
(Note/Tip on OS X 10.7 Upgrades: For owners that swapped in a Core 2 Duo CPU, the original tip for Lion dev previews is reported to still work - I.E. Install lion on a drive connected to a supported mac (Target Disk Mode, FW, etc) and then delete the (hidden) "/System/Library/CoreServices/PlatformSupport.plist" file. The Lion volume should then work with the Core2Duo updated Mini (or iMac). If there's an easier way (installer check edit, etc) send a note. TIA!
(See below for Reports of OS X Lion on C2D updated Minis)

OS X Lion 10.7.3 Update on Core2Duo Updated Macs:
(another follow-up on Lion updates from Luca sent within an hour of posting the Feb 1st 2012 OS X 10.7.3 Update)

(From Feb 1, 2012 mail)
"10.7.3 and C2D upgraded iMac
Hi, here's my usual report about my C2D upgraded iMac 20" and OS X Lion Updates.
I'm happy to say the 10.7.3 update (installed via Software Update) does not reinstall /System/Library/CoreServices/PlatformSupport.plist and the Mac reboots smoothly.

I think sometimes we have to expect the unexpected from Apple...
Best regards, Luca P."

Thanks again Luca.
(I was curious if the D/L Combo Updater would reinstall the PlatformSupport.plist file or not, since the 10.7.2 update did (see tip/notes below) but reportedly 10.7.1 didn't. Over the years the Combo updater has often been a fix for those that used Software Update or Delta updates and had problems, including some 10.7.3 (via SU) problems reported in Apple's forums. However it won't be a fix for all of course. But again I was wondering if the Combo updater would reinstall the PlatformSupport.plist file, which would have to be removed to boot a Core2Duo updated CD Mac.)
Update/FYI on Combo 10.7.3 Updater:
Brian K. sent a reply to my question above saying the 10.7.3 Combo updater did reinstall the supported models plist file. He said he was using an edited plist file to add support (where others just deleted the plist file) but it was overwritten by the Combo updater. So regardless if you deleted the file or edited it, from his experence Core2Duo upgraded (original CoreDuo/unsupported) mac owners should avoid the combo updater. (The 10.7.2 update also restored the plist file as noted here (with fix/tips) when it was released (see below), even when it was applied via Software Update, not the combo updater.)

Reports on earlier Lion version updates follow.

Warning about 10.7.2 Update on Core2Duo upgraded Macs (w/Fix)
One of the readers that had previously reported running Lion/10.7.1 OK on his Core2Duo CPU Upgraded Mac (originally a core duo model) sent a warning about 10.7.2 reinstalling the supported macs plist. (That file was deleted as part of the workaround to run Lion on C2D upgraded unsupported macs.)

(Added 10/12/2011 when OS X 10.7.2 update was released)
"Subject: Core2 Duo Upgraded Macs and 10.7.2 WARNING
Here's my usual report about latest update of my C2D upgraded iMac 20".
I'm sorry to say that 10.7.2 reinstalls the infamous /System/Library/CoreServices/PlatformSupport.plist and Mac doesn't reboot, showing only a "forbidden" icon in place of the apple logo.
  (The 10.7.1 update didn't recreate that plist file per several reports earlier this year.)

Booting again (fixing problem/deleting that file) is a very simple task if you have another Mac or a system DVD. (And having a previous OS version bootable clone handy is a very good idea in general. Well worth the cost of the drive IMHO.-Mike)
(If you have another mac) Just press T at the startup bong to boot in target (disk) mode, connect to another Mac using a firewire cable and delete /System/Library/CoreServices/PlatformSupport.plist on the newly mounted (C2D Mac's 10.7.2) Volume. (If you have an ext OS X bootable HD, power up w/option key held down and boot from it.)
Or with an OS X system DVD, just boot from it and start Terminal in the Installer menu bar, cd to the actual (Lion) hard disk volume and issue the command:

cd /Volumes/<HD NAME> (name of the C2D mac's 10.7.2 Vol)

rm System/Library/CoreServices/PlatformSupport.plist

That's it.
Regards and sorry for my bad english.
-Luca P."

Server 10.7.2 does the same thing. C2D Upgraded mini owner running Lion server sent a note about that. Same fix (removing file) of course.

Another 2GHz (T7200) Core2 Duo Upgrade Report:

(from Sept. 24th, 2011 email)
"Thanks to all of the information here, I was encouraged to upgrade my son's Mac Mini 1,1 1.66gHz model.
After acquiring a T7200 2.0gHz CPU from a notebook pull, we proceeded with the surgery. All went very well, I was even able to remove the plastic heatsink pins by using an electronics needle nose pliers and very carefully releasing them.
Removing the flat cable connection to the drive board is not a good idea, in my opinion; I removed it, and reassembly was a a bit tricky; it could have very easily been ruined in the process, I definitely won't be doing that again.

The results are great so far. The Geekbench score improved from 2117 to 2841! CPU temps seem like they're in the same general operating range as before. Next I'll have to get an SSD drive...
Thanks, Mike S.
Texas"

OS X 10.7.1 Lion/Lion Server on Core2 Duo Updated Mini (and iMac)
(*Updates* See later posts above on OS X 10.7.3 Update (Feb 1st, 2012) and previous Warning/Tips about 10.7.2 update.)
Reader mails from owners of Core 2 Duo upgraded (originally CoreDuo) Minis/iMacs. Some may have been concerned that 10.7.1 would break that or recreate the (deleted) "/System/Library/CoreServices/PlatformSupport.plist" file, but all reports so far said 10.7.1 still worked.
(Update: From Sept 14th, 2011 news page) Although 2 readers with Core2Duo upgraded CoreDuo Macs reported running Lion OK (see reports below from Aug 17th), I recd a mail on Sept 13th from a Core2Duo upgraded (CD) Mini owner that said the tip (see above) did not work for him. I wondered if something had changed (app store installer change, etc) or if this is another case of some detail not evident. (My first thought was the plist file was still present, so I asked and he said it was deleted.) Here's his email:

(from Sept 13th, 2011 email)
"I have an early 2006 mac mini that was updated to a core duo 2 cpu. (socketed CPU chip swap) It has worked flawlessly since the upgrade. I also maxed out the memory to 2GB... I read that I could defeat the Lion install block (check for supported models) by starting the mini up in target mode & installing the software to the mini's HD (from a Lion supported model) then removing the following "/System/Library/CoreServices/PlatformSupport.plist".
I did this and almost started celebrating. The next step was to start up the mini normally.
    Initially it looked as if the start up was going to be successful, then it sort of hiccupped and went back to the snow leopard start up screen. Along with a dialog box stating the system could not be installed on this hardware.
(Based on that message at boot, I thought the supported platform plist file was still present. I asked if he was sure that plist file was deleted - he later replied it was.-Mike)
Then I read on one of the list serves that Lion couldn't be installed on a 32bit system.
-Bill J"

Lion doesn't support 32Bit CPUs but a Core2 Duo is 64bit. If he means EFI32 systems, that's not an issue as 2006/2007 Mac Pros are EFI32 but have 64bit CPUs and can run Lion.
In reply to the above, on Sept 14th I recd another OK report on a Core2Duo upgraded CD Mini running OS X Lion, including the 10.7.1 update:

(from Sept. 14th, 2011 email)
"Subject: Lion 10.7.1 on upgraded mini
Hi Mike, I also have a 2006 Mac mini that i upgraded with a T5600 (1.83GHz Core2Duo).
I installed via FireWire target mode using my early 2011 MacBook Pro then deleted the .plist.
I used software update to get 10.7.1, no issues.
-Jonathan"

He also included a screenshot of "About this Mac" from Lion, showing his Mini 'Late 2006" with 1.83GHz Core 2 Duo:

And another successful Lion on C2D updated Mini report:

(from Sept. 14th, 2011 email)
"Subject: Lion on C2D Upgraded Mini Works Fine
Hi Mike, Just a quick letter in response to Bill J's trouble to say that I installed Lion on a Core 2 Duo upgraded Mac mini (Late 2006 "Macmini1,1") on September 9 using the method given on your site and all is well.
  Also to respond to the performance naysayers, this computer with an SSD is fantastic! Keep up the good work,
-David J.
Sydney, Australia"

SSDs really do make a difference compared to std HDs. So snappy it often 'feels' like you bought a new machine. (I'd almost forgotten what a difference it was until getting to play with an intern's new MBA. Going back to my 5400 rpm HD work machine, opening apps is slow as molasses.)

Reports that follow are copies from the Aug 17th news page:

(added 8/17/2011)
"Lion Server 10.7.1 update on CoreDuo to Core2Duo upgraded (Mini) works!
I have a CD mini upgraded to C2D (Core2Duo) that I installed 10.7 (I also installed the server app) using the "install lion from a compatible machine to the HD for a CD upgraded to C2D mini" (and deleting the above plist.).
Today I upgraded to 10.7.1 Server - no need to re-delete the plist file as it is not recreated in the server update. I can't speak for the non-server update but I doubt it would be any different.
-Brian"

And a report from a (socketed) iMac with Core2Duo CPU swap:

(added 8/17/2011)
"About 10.7.1 update (on C2D upgraded iMac)
I just wanted to let you know that is safe to upgrade to 10.7.1 for those "Core2 Duo upgraded" Macs with Lion.
I installed Lion on my 20" white iMac (using the destination disk mode hack and removing PlatformSupport.plist before rebooting) and I have just installed 10.7.1 without problems.
Regards, Luca P"

More 2.33GHz (T7600) Core2 Duo Upgrade Reports: (later added first)

(added 8/15/2011, updated 8/19)
"2006 Mac Mini Intel Core Duo 1.66GHz upgraded to Core 2 Duo 2.33GHz T7600 SL9SD.
Already upgraded the memory to 2GB a while ago and then decided to upgrade to a bigger Hard Drive. Whilst browsing for info, I noticed that a cpu upgrade was also possible - so I did that too.
Used the OWC video (at their DIY Videos page) to remind myself how to pull it apart and then the video on this page to remove the motherboard.

Got the cpu and a packet of nylon nuts and bolts from eBay and some thermal paste from the local computer shop. Everything went smoothly and I even managed not to break or damage the original pins that secure the heatsink.
I supported the head of the pin with the flat end of a lead pencil, pressed on the spring and squeezed the flared edges of the pin with a small pair of needle nose pliers. If you then release pressure on the spring slowly whilst still squeezing the flared ends, the pin will then pop gently through the board without flying off into your room somewhere.

Very happy with the results. Mini is much more responsive with no noticeable increase in heat or fan noise - just as quiet as it ever was!

All up cost was about $150.00 AUS (not including the HD). Could have done it for much cheaper using a T7200 2GHz but couldn't resist the T7600 when one came up.
(Update from Aug 19th mail)
Purchased Lion through the Appstore it is now working on the upgraded Mini.
But had to take a few extra steps along the way.
I have no access to a Mac that is supported by Lion so I couldn't do the Firewire target drive process. Instead:
Carbon Copy Cloned my Snow Leopard mini HD to an external usb drive.
Joined the Tonymac forum and downloaded iBoot, Multibeast and XMove - a site dedicated to running retail OS X on PC's. Created the iBoot CD and loaded it onto my desktop Dell Core 2 Windows computer along with my cloned Mini HD. The Dell then booted up fine and then loaded the Mini HD. System Information reported that I was simulating a MacPro 3.1.
Connected to the Appstore and purchased Lion - downloaded it and then installed it onto my cloned Mini HD.
Modified the PlatformSupport.plist file and then reconnected the external HD to the Mini and booted from it.
It worked!
Deleted the CC clone logs on the external and reformatted the Mini internal drive, then CC cloned the external drive back onto the internal Mini drive.
Shut down, disconnected the usb external drive and rebooted into Lion on my Mini. Upgraded to 10.7.1 - no problems.

Was a bit of a process - but I was determined to do the job without using a hacked torrent from somewhere. (beware gifts bearing trojans) Have left out a couple of trial and error steps in what I did - but I got there and everything works.
-Guy H.
Australia"

(added 8/5/2011)
"Upgraded my 2007 Mac Mini 2.0Ghz (T7200) with an 2.33GHz (T7600) yesterday. Bought T7600 at ebay and the seller included a "special" tool to prevent break off the brittle, springed nylon locks holding the heatsink in place against the CPU.
Overall I'm very happy, though it was a small jump :)
Lars AH, Norway"

(added 6/20/2011)
I upgraded a 1.66 Core Duo to a 2.33 Core 2 Duo chip from eBay for $128.
These instructions worked great. A 2.5mm allen wrench is the tool to loosen the metal cylinder near the Mini's memory slots if the correct Torx is not available. And I concur that it is impossible NOT to break off the brittle, springed nylon locks holding the heatsink in place against the CPU.
I have a small handful of extra M3 x 20mm nylon "bolts" (actually machine screws) and nuts that will replace them.
-TP"

Another T7200 (2GHz) Core2 Duo Swap Report:

(added 4/22/2011)
"I have just upgraded from a 1.66GHz Core Duo to a 2.0GHz Core 2 Duo (T7200) that I bought on eBay for £40, as well as swapping the HD for a Corsair F120 SSD, and the difference is amazing.
iPhoto is now super-snappy rather than barely usable.

Thanks to the advice on this page I was well prepared with nylon bolts, as I did break one of the existing clips when dismantling. I also found it helpful to attach the heatsink with two bolts without the springs first, to keep it in place while I attached the other two complete with springs - I could then go back and add the springs to the first two.
I was a little confused as to what a 4-40 bolt was to begin with, (#4-40 is an american (inch) std thread - size #4 w/40 threads per inch. ) but a little bit of research showed that the metric equivalent (appx size) is a 20mm M3 bolt. I bought a pack on 10 (bolts + nuts) from eBay for £1.60 and they fit perfectly.
Thanks, Jon H."

T7600 (2.33GHz) Core2 Duo Upgrade Report:

(added 3/25/2011)
"Hi Mike, Swapped the 1.86Ghz chip with a 2.33Ghz model pulled from an IBM T60p laptop.
CPU Model is T7600 - 2.33/4M/667Mhz, LF80537
No problems or issues.
I have a spare one if you know anyone who is looking.
(NOTE: I think it's sold now after 2 readers asked about the 'spare' CPU)
-Stacy P."

Another T7200 (2GHz) Core2 Duo Upgrade Report:

(added 3/21/2011)
"After reading the recent reports, I decided to give my mac mini a speed bump. Purchased a T7200 chip (2 Ghz, Core 2 Duo) off ebay for $50. Purchased everything I needed - acetone, thermal paste, and the 4 nylon screws and nuts.
After a few flying screws and springs, (all of which were miraculously found!) I managed to get the chip swapped. When reassembling the mini, I realized that I placed the heat sink in the wrong direction. After getting it all back in place, the mini booted up. It appears to be a bit snappier. I do not have a monitor hooked to the mini. I use Screen Sharing via my Imac to access the mini. I use the mini for home automation via Indigo and surveillance via Security Spy. It's also used for music throughout the house via Itunes. I leave those three apps running at all times so it does need all the extra muscle that the 2 Ghz chip over the 1.66 Ghz chip.

One thing I noticed is that the fan was spinning at high speed. Having swapped out the hard drive and memory, I encountered this problem before as I had forgotten about reconnecting the wire that is in the front. Only this time, I did not forget to reconnect it. Took the mini apart several times to ensure I hadn't forgotten anything. Still have the fans spinning at 5495 RPMs. Core Temps have hovered around 50 degrees C.

I'm wondering if I need to remove the heat sink and essentially start over to get the fan speed and noise back to normal. Hoping someone can give me some good advice on this. Have had the mini running under the new chip for approx. 24 hours now.
Thanks, Lee M."

More T7200 (2GHz) Core2 Duo Upgrade Reports:

(added 3/14/2011)
"Got a mini 1,1 with 1.66GHz core duo for $75 and put in the 2GB RAM + Seagate hybrid drive (HDD+SSD cache) I had sitting around. Runs fast. The hybrid drives gives it speed approaching SSD for boot and commonly used applications.

Got a C2D T7200 CPU from ebay for $45 shipped and replaced the 1.66GHz CD. I broke 2 out of the 4 fan installation clips like most people did. No worries, local ACE hardware store had the 4-40 3/4 inch nylon bolt+nut for $2 for a set of 4. I used these on the reinstall. A nice trick on the reinstall is to put 2 of the nylon bolt+nut pair on diagonally without the springs just to hold the heat sink in place. This allows you to install the other 2 with spring on. A second pair of hands is helpful to spin on the nut while one person use a flat head screw drive to push the bolt through and tension the spring.

As others have, I used acetone to clear the old gunk off the heat sink. I used (Arctic Silver) AS5 paste and it has worked well. Temperature is about the same as before.

Got a AOC 21.5 LED 1920x1080 monitor for this since the new 21.5 iMacs have the same resolution+LED lighting. Looks awesome. The new C2D T7200 scales hulu.com to full screen without much problem (1.66GHz CoreDuo had jitters) There are still a few drops here and there but much less noticeable.
-Howard C."

And another T7200 upgrade report from March 2011"

(added 3/14/2011)
"Got my T7200 (2GHz, C2D), purchased from Ebay, yesterday. I paid some $80 for it. Swapping took some 30 minutes. The new CPU replaced a 1.66 GHz Core Duo. The job was easier than I'd thought it'd be. On the other hand I have had my Mini (Macmini1,1) opened a few times before, to upgrade memory, hard drive and also the wireless card. I ran a Geekbench test before the change and one after (2.1.12 for Mac Os X x86, 32-bit). OS is 10.6.6.
Here are the results:

Before:
Geekbench Score: 2175
Integer: 1634
Floating Point: 3400
Memory: 1457
Stream: 1194


After:
Geekbench Score: 2750 (26 % increase)
Integer: 2258 (38 % increase)
Floating Point: 4129 (21 % increase)
Memory: 1840 (26 % increase)
Stream: 1475 (24 % increase)

Cheers, Mikael"

T7200 (2GHz) Core2 Duo Upgrade Report:

(added 2/8/2010)
"I usually work on Apple laptops but I did my first intel Core Duo to Core 2 Upgrade on an Apple MacMini today along with an upgrade from the base 512 MB to 2 GB as a favor for a friend. I used a T7200 (2 GHz) bought on the net from a place in west Japan (I am in Tokyo) for 14,900 yen plus 2 x 1 GB of RAM for about 2000 yen each, so the total cost was just about 20,000 yen without shipping. (Could not find the T7200 in Akihabara although there were a lot of T7400 and T7600 for what I though were excessively high prices for an old CPU.)

In terms of difficulty, the hardest part was getting the heatsink off the old CPU, because Apple in its wisdom decided to use rather fragile plastic spring-loaded clips that degrade in tensile strength with heat aging (more built-in obsolescenceÑwhy does Apple love to use plastics and double-sided tape to secure key parts) and one of them broke as I was gently releasing it. Fortunately, my large tray of random screws from years of laptop disassembly and parting yielded some thin screws that worked just as well as spring loaded clips.

One point to be very careful about is the orientation of the heatsink on the chip; I lost my focus for a few seconds when the clip broke and forgot which way the heatsink went back on. The result was that I replaced it 90° rotated, which I only discovered on trying reassembly and added 20 minutes to the job.
The RAM upgrade was painless.
Total time was about 2 hours because I was going slowly but having done it once, I think an hour is about right.

Going from Intel Core Duo at 1.66 GHz to Core 2 Duo at 2 GHz makes a huge difference in perceived speed, especially with upgrading to 10.6.2 (usability rating is 9/10).
In terms of cost effectiveness, I think it's just about OK at around $200 and gives a new lease of life to this machine with Snow Leopard (cost effectiveness rated 8/10).
The next upgrade when/if the owner can afford it is to change the slow stock 60 GB HDD to either a fast 7200 rpm 250 GB HDD or a 120 GB SSD.
-Robert H."

"Eng. Sample" T7400 equiv. (2.13GHz) C2D Upgrade:

(added 8/13/2009)
"Mike, I upgraded the CPU in my Mac Mini today from it's original T2400 (1.83/2M/667) to a T7400 equivalent engineering sample (2.16/4MB/667 ES). I bought the CPU from eBay before I realised it was an engineering sample, however it has made no difference thus far. My motivation for upgrading was that the T2400 was dropping frames on full screen Flash video (Flash seems more CPU hungry on Mac OS X than on Windows---grrr---I hate Flash). (amen brother...)

I conducted two simple benchmarks both before and after the upgrade to make me feel better about spending the $168.00 USD.

First I measured the CPU utilization of Safari using "top" whilst the browser was at the main menu of a Flash based video-on-demand site (I would have liked to have used actual playing video, but the usage varies as the video plays, and I was too lazy to take a specific piece of video and calculate an average). For some reason the static menu uses a fair-bit of CPU power. Here are the results (before --> after)

Flash Page Open (Safari): 53-56% --> 38-41%

And secondly I used GeekBench. I'm not a fan but it's fast, simple and free. (I've never used it personally but doesn't a Geekbench license cost $19.95 still? Not a big fan of Xbench either, but it's free and has always been popular as simple/quick benchmark.-Mike)
The 32-bit benchmark of Geekbench is free. You have to pay the $19.95 for the 64-bit and Rosetta benchmarks.

GeekBench: (before --> after)

• Overall: 2353 --> 2908
• Integer: 1877 --> 2398
• Float: 3622 --> 4299
• Memory 1524 --> 2049
• Stream 1236 --> 1551

As for temperatures, even though there is a TDP increase of 3 Watts, I noticed a slight lowering of 3 degrees at idle and 1 degree at load (note that room heated with the day as I conducted the before and after tests). This was probably due to the fact I was able to blow some dust out of the machine, and the extra work I spent sanding and lapping the CPU heatsink (the old thermal paste was quite difficult to remove, which started me off on the tangent of trying to clean-up the surface as best I could). Or maybe I somehow interfered with the sensor with the heatsink.

Oh one other thing, on the first boot there was a scary wait of an extra few seconds for the startup chime to sound---I've never been so relieved to hear it!

Most importantly for me, I've watched a few minutes of full screen Flash video and I haven't seen any frame dropping. So I'm very happy.
I would do it again. Although I still feel a little uneasy about having unintentionally purchased an engineering sample. Thanks for the great site,
David"

There's pros and cons to ebay - sometimes a great deal, sometimes you may not get exactly what you thought (or was promised).

Another 2.16GHz T7400 Core 2 Duo Upgrade:

" I bought a 1.66GHz Core Duo mini off of eBay for use as a home theater computer, as the process of getting a DA G4 was just about never ending with trying to add parts for remote control and a reasonable HTPC front end was just about non existent. While playing a high bit rate file, the video would play fine just occasionally dropping a frame, but the audio would drop out constantly.

I determined that the only option was more power! While it appears from what I read, that the T7200 (2GHz), does fine for what I wanted, I figured it would be better to be a bit more future proof with a faster CPU. While I wanted to get the T7600 (2.33GHz) it was the most expensive of the three options, and over $250 at the time.

I bought the T7400, which is a 2.16GHz part, from a vendor on eBay, kaga0719, who I recommend fully - just make sure it has pins, as he has reworked BGA parts that have pins, and ones that don't. The CPU arrived within a week of payment, and when the weekend arrived the fun began! Kaga supplies a thermal compound, but since I already had some Arctic Silver I used the AS.

Recommend tools/supply list:
• Putty knife
• 4 x Nylon 4-40 nuts
• 4 x Nylon 4-40 3/4" bolts
• Acetone
• Q-Tips, Toothpicks, Scotchtape
• Needle nose pliers
• Thermal compound

I already had a putty knife from upgrading the memory in my G4 mini, but I forgot to pick up some acetone to clean the heatsink, so I had to make due with a fair bit of rubbing with other solvents and Q-tips.

Since I expected the plastic pin's retainer clips that hold the heatsink down to be damaged beyond safe reuse during the removal, I bought a set of 4-40 nylon nuts, washers, and bolts at a very good hardware store. I understand that they can also be had a hobby/model/remote control shops. At the time, the set plus a extra of each was a buck, but when I bought several sets recently, they prices had gone way up to two bucks for each set. Anyway, the bolts should be 0.75 inches as the original pins 'inside' length is 0.65 inches. In the final assembly, I didn't need the washers, and they would have made it much harder if I tried to use them.

While the pins are replaceable, the springs that push the heatsink down on the CPU are not. Do NOT let them fly! I recommend just using some scotch tape, and taping over the pins on the heatsink. This will keep them from flying off, and you can easily extract the pins and keep the springs.

I used a set of needle nose pliers to compress the retainers, but until one applies big tools to extremely small parts, one can not appreciate how careful you must be while working with the mini's motherboard! Originally I planned on using a diagonal cutter to clip the bottom of the pins, but when my Snap On cutter came close the the motherboard, I didn't like the looks of what could happen, so I used the needle nose pliers to compress the clips.

I've read that some people didn't notice the locking mechanism for the CPU, and have damaged the socket, or the motherboard trying to pry the CPU out! So remember to turn the screw on the socket to unlock it!

The new CPU goes in and a bit of Arctic Silver goes a long way. Make sure the the heatsink is put back on with the correct orientation! You might want to also have some toothpicks to help keep the heatsink in position while you do battle with the nylon nuts and bolts and the heatsink. A third hand would come in really nice at this point!

After putting the mini back together, but before the top is on, start it up and make sure everything is running right. There are plenty of connectors that might be forgotten during the reassembly and re-cracking the case is an avoidable pain if something isn't connected.

Post assembly, everything runs great! However I noticed while using Handbrake, the CPU temps would get very high. While this chip is rated for 100 degrees C, it was running in the mid 90s for hours at a time while going through my Handbrake queue. This was handled by using a third party fan control program. It now runs in the 70s while processing the Handbrake queue, but the fan is quite loud at 5500 RPM.

While using the mini for the home theater running Plex, and even with high bit rate files I don't think that the fan has ever run up to more than a barely noticeable level(unless Plex has locked up...).

From online discussion, it would appear that, in general, the T7400s run a bit hotter than the T7600s, but I can live with it for a $100 price difference!

An additional benefit of upgrading the CPU with a Core 2 Duo, instead of the much cheaper Core Duo part is that I can use a faster Apple wireless card, of which the only requirement is a C2D.
Thanks again for a great site Mike!
-Erik

Thanks Erik

2.16GHz T7400 Core 2 Duo Swap:

(added 1/13/2009)
"I got my C2D CPU today and just installed it into my second Intel-based Mini. It's a T7400 2.16GHz processor. After doing the first upgrade to my other Core Solo Mini, this was a breeze and machine was running is under 20 minutes.

My main "burn-in" test was downloading and installing Windows updates on XP Home in a virtual machine using Vbox. The DL and save for SP3 pushed my Samsung HD to about 75 degrees C and at one point the CPU A temperature diode registered 80 C. Each core showed about 70 C at its highest. These were registered using Temperature Monitor version 4.4. (freeware utility available at http://www.bresink.com/osx/TemperatureMonitor.html)

I added SMC fan control (from here), then set minimum RPM to 2500, which improved things roughly 10% across the board. So far so good.

This Mini was purchased as a used refurbished Core Solo 1.5 Ghz for just under $300. CPU was bought new online for $185 shipped. So final total of less than 500 bucks yielded a machine which I cannot buy from Apple, since they (currently) only offer a 2.0 GHz C2D as the fastest processor. Thanks again for the database, your commentary and stellar website. (he later wrote)
With regard to the Mac Mini upgrade, I'd say it's an 8 (on the 1-10 scale). It achieves one primary task of making the machine faster, but at $150 (the current average for good used guaranteed T7200 and T7400 CPUs) the system still lacks dedicated video memory. Also of great consideration is the additional heat (BTUs/hour) will shorten hard drive life span. Possibly Apple chose not to install processors faster than 2.0 GHz partly due to this factor.

A couple other details to mention about my rig: it's dual-boot Tiger and Leopard. I run Bresink's Temperature Monitor to check things but noticed since the CPU change on-screen monitor function (toggled by Command + 3) doesn't behave consistently. Sometimes trying to enable it results in no data appearing until I access Preferences and move a slider or affect some other parameter change to update the program. This is not a huge problem, just a minor glitch. I updated both OS installations with latest version and sensor drivers but this made no difference. I even trashed preference file in each OS, then relaunched program from a cold boot. The symptom persists.

Over the weekend I tried a PC game and also processed some sound using Audacity and Audio Hijack Pro. Additional performance from a faster dual-core CPU enhances the experience dramatically. This upgrade effort rewarded me with about 1/3 the processing time required as previously. Thanks again for all your efforts and information...
ALOHA, Chris"

2GHz T7200 Core 2 Duo Swap:

(added 11/11/2008)
"Hi Mike, I recently purchased a Core Solo Mac Mini with a 60gb HD and 1MB ram. I purchased the Core Solo on Ebay for a great price. I bought 2GB ram and a Seagate 250GB 5400 rpm HD from OWC. Found a 2 Ghz Intel T7200 core 2 duo on Ebay for $114 shipped.

This is the second Mini I have upgraded and the take-apart an replace process went well. Used web available instructions (MacBidouille) to get me through the steps involved. (Heres a reader's Mac Mini Intel CPU Upgrade Guide from spring 2006 also.) I left the Combo drive in the Mini since I have an external Superdrive compatible from OWC.

The Mini has been rock solid for over a week. Smc fan control shows operating temps in the 50s centigrade under normal use which for me is word processing, email and web surfing.

Total cost to me was $515 for a Mini that sells for about $699 at the Apple Store's refurb page. Overall, I rate the combination of these upgrades a 10. Thanks for a great Mac site.
-Ron"

Thanks Ron. The Mini (and iMac) Socketed CPUs are a real plus (hope they keep those in the future).

1.83GHz Core 2 Duo CPU Swap: (the nice thing about Intel CPUs is over time price drops a lot, especially on speeds that are not at the top end.)

(added 1/28/2008)
"Mike, I know that cpu upgrades are often more expensive than is justified by cost alone. That said, I replaced my 512mb Mac Mini 1.83ghz Core Duo with a 1.83ghz Core 2 Duo. I bought the Core Duo Mac Mini for $479 from the Apple refurbs page on Apple.com. I bought the Core 2 on Ebay for $125 shipping included and sold the Core Duo on Ebay for $60 for a net cost of about $65 minus Ebay fees. While I had the Mini disassembled, I also upgraded the ram to 2GB. The ram is from site sponsor OWC, a great Mac outlet on a great Mac info site, XLR8yourMac. At the time refurbs with DVDwriters and 1GB ram were selling for $599 on the Apple site if you could get one. My cost was $479+42+65 with the ram rebate of $6 after postage from OWC offsetting the Ebay charges. So with a total cost of $586, I did get under the cost of a refurb, and well under the(at that time) price of $799 for a comparable new Mini with only 1MB of ram.

Since specs and speed test results for these configurations of Mini are available elsewhere on the web, I have not tested and posted here. All in all, the experience of completely disassembling the Mini was invaluable as a confidence builder in future upgrade work that I may undertake.

For anyone contemplating a cpu upgrade on a Mini, I would suggest getting a set of 4 Philips nylon machine screws and nuts in size 4-40 by one inch long, in case the any of the four nylon fasteners which hold on the heat sink get damaged when you remove the heat sink.

With 2GB RAM and the Core 2 Duo processor, the Mini is responsive and fast enough for all my computing needs. This Mini is connected to a 65in. Toshiba HDTV rear projection tv with Eyetv2 and a now discontinued Miglia TV2 Mini HD as software and tuner. The video is terrific and with the Apple wireless KB and mouse, I can surf from the couch when I'm not recording or watching tv programs.

I've been reading the site and using your and the readers' hints and tips for many years now and couldn't be more satisfied. Thanks a lot for the good work, and thanks to OWC for being a customer friendly retailer.
-Ron L. "

2GHz Core2 Duo Upgrade:

(added 2/12/2007)
"I've just completed an upgrade on a Mac Mini from the original 1.66 GHz T2300 to a new Core 2 Duo 2.00 GHz T7200. Got it for $295. Would be a scary amount of money just for an upgrade, but I'm putting the old Core Duo into an MSI Axis 945 GM system for use as a MythTV frontend.

Significant speed increases on anything processor intensive, which really shows up well in the XBench CPU tests. Disk is still the real slowdown, as the Photoshop tests show. I watched my Menu Meters CPU utilization during the Photoshop tests and only saw it go over 50% in 2 or 3 of the steps and not for very long, so its not a great indicator of the improvements.

I haven't watched temps much yet, but the machine never had problems before and the thermal paste I used was much higher quality than the stuff on the old one. I do use a fan speed mod that keeps the base fan speed a little higher than the default, mainly to keep it from cycling up to high speed so often. The new processor should only generate 3 more Watts (34 vs 31).
Thanks for the great site and all the work you do. I read it religiously.
-Keith

The Photoshop benchmark from Retouch Artists:
Pre Upgrade : 3:46
Post Upgrade : 3:19

XBench 1.3 Before/After Upgrade: (Major category scores)
Results 78.29 / 88.36

System Info
Xbench Version 1.3
System Version 10.4.8 (8L2127)
Physical RAM 2048 MB
Model Macmini1,1
Drive Type ST98823AS
CPU Test 64.30 / 104.62
Thread Test 165.28 / 200.56
Memory Test 108.78 / 115.58
Quartz Graphics Test 110.33 / 140.09
OpenGL Graphics Test (spinning squares) 190.10 / 245.70
User Interface Test 280.37 / 269.25
Disk Test 24.56 / 24.33
Sequential 41.15 / 40.75
Random 17.50 / 17.34"

Xbench scores can vary run/run (especially disk scores).

This report is on a Core Duo swap - not a Core 2 Duo.

(added Jan. 16th, 2007)
"Machine: Mac Mini (Intel)
Original processor: Intel 1.5GHz Core Solo
Replacement processor: Intel 1.83GHz Core Duo (Model # T2400)
(other reports here are on Core 2 Duo swaps)
I picked up this processor inexpensively in OEM format. I bought it used, on ebay for just under $100USD. I was looking for the biggest bang for my buck, and $100 for a 1.83GHz Core Duo was the cheapest I could do.

It was a fairly easy install procedure, only requiring a little bit of thermal grease. Working inside a Mac Mini is much like working inside a laptop. Mac OS X picked up the change in processors immediately, with no intervention on my part.

It's been stable and solid for weeks now, running at about 50° Celsius, which is much lower than my similarly clocked MacBook Pro. Xbench scores went from a 75 to a 94 with just the processor change. (http://db.xbench.com/merge.xhtml?doc1=201198&doc2=196335).
I would rate this an 8, because it was an easy install, and priced well, but it was not a "supported" upgrade. If I had screwed something up, I wouldn't have any official channels to get support from.
Thanks, Adam"

The prices for a (new in box) Core2 Duo 1.83GHz model is under $250 last I checked. (See notes below from Dec 18th posting/price checks on Core 2 Duo Mobile CPUs - Core Duos would be cheaper than Core 2's.)

(added Dec. 18th, 2006)
"Hi Mike, i wanted to let you know i swapped my 1.5Ghz Mini's CPU with a T5600 (1.83GHz) Core 2 Duo and was still much cheaper than buying a 1,83 original mini. I paid 400 euro for the mini + 180 for the core 2 duo (1.83GHz) cpu so was 580 rather then 799 from apple store. ok, mine doesn't have superdrive (40 euro from ebay) and a smaller hd, but i think 20 gigs more hard drive space aren't worth 200 euros (especially now you can get 350GB usb drives for 150 euro).
-Diego "

Nice savings. Typically the higher speed CPUs have a big price difference and you can save a lot of $$$ by buying one of the lower speed models (and over time as faster speeds are intro'd, prices drop). I checked some prices online recently for mobile Core2 Duos that shows this. (Prices can vary, this is just a snapshot from last week as an example of the differences at a vendor)

Core2 Duo (socket M) (early Dec. 06 pricing)
• 1.83GHz - appx $242
• 2.0GHz - appx $296
• 2.16GHz - appx $420
• 2.33GHz - appx $650

(added Oct. 24, 2006)
" This should say it all. :)

Got the CPU from NewEgg. Around $670. I didn't run any performance tests, but it is definitely snappier. Boot time in about 24 seconds, which is about the fastest I have seen in any of my Macs. I also installed a 160 GB drive (I was already maxed out in the memory department).
This mini originally had the 1.83 Ghz Core Duo (Late 2006 model Mini).
-Kim B. "

(added 10/3/2006)
"I upgraded my Mac Mini to a Merom T7200 2.0GHz 4MB L2 Core 2 Duo (that's a lot to type) today and posted some early benchmarks and experiences. Regular applications are slightly faster, but I haven't done anything hardcore such as encoding HDTV to h.264 or any video editing yet.
Fan noise is definitely a bigger issue now than it was before, but I don't know how much is due to cramming in a 20% faster CPU with more transistors and how much is due to the 10.4.8 OS upgrade.

The article with some preliminary benchmarks is available at this page with a solicitation for other tests to try.
Thanks! Art. "

(added Sept. 19th, 2006)
" Hello Mike, I just wanted to tell you that I transplanted a T7400 Core 2 Duo into my "new" (late 2006) Mini 1.66GHz/Combo Drive/2GB today, using Arctic Silver Ceramique as thermal paste.
The Mini recognizes the new CPU correctly as a Core 2 Duo 2.17 GHz.

The system has been absolutely stable so far (couple of hours). This is one fast devil now.
Even graphics are sped up - NoLimits (rollercoaster simulator) tracks still look odd (no vertex shading with GM950 GPU), but I noticed approx. 50 percent higher minimum frame rates (max fps are 95-100 as before). The system seems much more responsive overall, too. Just for fun , I also put a Pioneer DVR-K06 "super multi" in the mini. The drive is officially supported by Apple, and was immediately recognised by the mac.
(I asked him what price he paid, as in the past the cost of the CPU was about as much as the Mini)
Here in Denmark, I paid 462.29 (Euros), including 25 % Danish VAT. Assuming 1 Euro equals roughly US$ 1.20, and leaving out VAT, that would be 444 US dollars, 555 with VAT added. I know, this is economically insensible to put a killer CPU into a basis machine, and I'm not overly wealthy. But it's fun.
Best, Sebastian "

(added June 12th, 2006)
"Core 2 Duo (Merom) Mac Mini CPU
Benchmarks in Windows XP Pro from SiSoft Sandra 2007 and OS X from Xbench 1.2 (not the greatest benchmark...) have been posted here:
(photo gallery including take-apart pix)
http://homepage.mac.com/macaholicg5/PhotoAlbum12.html
-macaholic "

(Copy from the June 8th, 2006 news page)
Tony C. sent a link (translated) to a forum post on 2.16GHz Core Duo CPU swap in a Mini. Includes some benchmark comparisons to G5 towers.
At first I thought this was just another T2600 (2.16GHz) swap, but some comments in the post mention a Merom T7400 (aka Core2, 4MB L2), I didn't think they were shipping yet (until August?) and down the translated page it mentions a "T2600" and the Apple System Profiler screenshot shows 2MB L2 cache, but in some of the text down the page (benchmark section) it says "Mac Mini/Merom 2.16GHz" (original Core Duo 2.16GHz is T2600).
I asked if any readers fluent in Chinese could clarify this from the untranslated page, and a couple replied the article did mention using a Merom CPU.

" i'm a native speaker of chinese. This Web site shows the new Merom in mac mini, it says the CPU is too new to be recognized by the latest osx 10.4.6, so it shows Genuine Intel CPU, and what follows is the comparison with G5 Duo 2.5Ghz 250GB HD and 6.5GB Ram/ G5 duo 1.8Ghz with 160GB HD and 4GB ram. By the way Mac mini/Merom Core 2 Duo2.16G/5400rpm 80G HD/2GB Ram.
Hope this helps....
-'Elvis' "

As mentioned in previous posts, these CPUs currently cost about as much as a Mac Mini, but prices should drop over time.

Intel-Based Mac Mini CPU Swap Guide: (from the May 5th, 2006 news page)
Tommy sent a note he's posted a Mac Mini Intel CPU Upgrade Guide with step-by-step photos. (Linked page in English, but top of page has link to a copy in Italian.) There's also a later posted start/finish Mac Mini (Intel) CPU Upgrade Guide.