News Archive for Friday September 30, 2011: (Updated 3:50AM Oct 1st)
Macs | CPU Upgrades | Video | Storage | Audio | Apps/OS/Network | Contact
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= Recent Articles and Reviews =
|MacBook Pro ExpressCard Reports page updated:|
Added a long post to the page of Express34 Card reports from a MacBook Pro 4,1 owner w/Sonnet Tempo Pro eSATA Expresscard, Sonnet 5P enclosure and a mix of Samsung F1 and F3 drives that had problems (freezes, etc) if the F3 drive had journaling enabled. (A deja-vu moment - similar issues with early firmware Seagate 1.5TB drives back in 2008. And earlier that year some older iMac owners had similar problems w/early firmware Samsung F1 drives.) Both were fixed in later firmware updates, but not sure what firmware his F3 drives have or if that's really the root cause of his problems.
|Another 2006 Mac Pro w/Quad-Core CPUs and KP's after Lion Upgrade|
(From later tests, sounds like it's not limited to the lower riser but total amount of ram.)
A reader mail in reply to all the posts in the last 2 weeks on 2006 Mac Pros (1,1) w/Quad-Core CPUs, OS X Lion and Kernel Panics. (Previous posts had Tips, some saying 2007 EFI update helped and some not having problems.)
"Re: 2006 Mac Pros w/Quad-Core CPUs, OS X Lion and Kernel Panics
My 2006 Mac Pro (upgraded to 8 cores with 2 Xeon 5355's) doesn't experience any KP's with Lion if I remove the lower memory riser. I noticed it was reporting that the 2GB DIMMs were only 1GB. I tried every combination of RAM possible to make sure it wasn't defective RAM.
(The comment on incorrect reported ram mix reminded me of an older article here - Mac Pro FB-Dimm Pairing Guide/Tests w/mixed 1GB, 2GB and 4GB pairs - however his ram config was ok until recently.)
Now I have 6GB of RAM instead of 12GB, (Riser removed) but I don't get any KP's. Maybe it's just a coincidence and my memory riser went bad right when I installed Lion. It would be helpful to see if it helps anyone else out.
I wrote earlier today with some questions I had:
- Were the KP's so frequent (before removal) that you could not run apple Hardware Test to see if it flags that riser/RAM?
- Do you have another Drive with a pre-Lion OS to boot from as a test?
(to see if riser/ram installed causes problems in another OS.)
Update - email reply @2AM Sat.
"The KP's occur when the CPUs are stressed like opening multiple applications and rendering video at the same time.
I was able to run memtest under snow leopard and apple hardware test booted off a CD and it didn't KP or catch any hardware problems.
I tried multiple memory configurations swapping different sticks in the lower riser and I can get it to crash every time, so I'm pretty positive either all of my memory is good or they are all bad. I don't get any KP's with the lower riser empty so that means the memory sticks are good.
Do you have any util like Temperature Monitor to check what the FBDimm temps are during stress tests? (the FBDimms have a serial/parallel chip that runs at appx 4GHz IIRC and can get very hot - but properly heatsinked/good modules have been reported OK at over 80C in some tests.)
I just wonder if for whatever reason, the lower riser area is running hotter maybe. But I dont know why Lion would have affected that. (Unless something is corrupted on the Lion install... I'd be tempted to do the usual voodoo drill (reset smc/nvram/corrupted file check, reinstall D/L updater, etc etc) - but just guessing. Makes no sense to me why lion would cause this assuming a good install/good hardware otherwise. But it's 3AM so I'm calling it quits for tonight.)
If it were me, I'd rather run 10.6.x with all RAM installed/everything working fine.
Update - email @3AM Sat.
"Something else interesting, I installed all 4 of my 2GB sticks in the upper riser (with the lower riser empty) and I can make a KP. Swapping out a pair of 2GB for a pair of 1GB (going from 8GB down to 6GB), the system is stable.
You're right, it is late. I will do more testing under SL with Temp Monitor over the weekend. Let me know if anyone has reported anything about removing the lower memory riser.
So then it's not just an issue with the lower riser, but related to total ram installed? (addressing?)
If anyone else with a FBDimm (2006-2008) Mac Pro has seen anything like this, let me know. Thanks. (Will write previous readers w/MP 1,1/QC/Lion KPs, including those that updated to 2,1 bootrom.)
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