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2012 Mac Mini 16GB RAM (1.35v vs 1.5v)/LED Cinema Display Problems:
(Wasn't able to reply via mail to this concern about ram voltage/CL timing, so posting here.)
A reader with a similar mini (late 2012 i7, 27in LED Cinema Displays - both MDP and TBolt) said he had seen problems with (intermittent) black screens IF two of his (1.35v, CL11) 8GB sodimms were installed, but not if only one was or if one was paired with an OEM 2GB sodimm. (No problems seen with the OEM pair of 2GB sodimms either, which I think are 1.35v/CL11 IIRC.)
   Said he tried a 2nd set of the same (1.35v/CL11) 8GB sodimms - same display problems seen. So he bought a pair of 1.5v (CL9) 8GB sodimms - no black screens seen with them he said.
(BTW: Apple doesn't go as far as listing voltage or CL ratings in their docs on ram, only the primary/type specifications. See (Late 2012) Mac Mini: Memory specifications and upgrades. But I also know some macs have a history of being picky about ram. There's even an old article here (w/dimm spd patcher) from 2001 about a PowerPC Mac (G3/G4) firmware update resulted in some CL2 PC100/PC133 dimms that didn't have CL3 timing in the SPD not being recognized.)

  I've not seen any problems (no black screens, or other problems - display or otherwise) with two 8GB (1.5v, CL10) sodimms installed in a late 2012 (i7) Mac Mini using an 27in LED Cinema Display (MDP model with latest display firmware) connected to the thunderbolt port of course.
  I think there is some other reason for his problems but if anyone else has seen a similar problem with a pair of 8GB sodimms in a Late 2012 mini, send a note (w/ram spec info). I always prefer not to mix ram types/sizes (for stability as well as performance reasons), but had not heard of any issues otherwise in using matched sets of dimms. (Always a chance of defective ram of course but two 'bad' sets in a row are rare unless it's a mfr/batch/spd issue.)

(And BTW - for the reader that asked, the ram (Original/OEM sodimms vs 3rd party) had no effect on the late 2012 mini hibernating after hours of sleep. I explained this in a post (w/apple doc) back in February here on Why 2012 iMac/2012 Mac Mini won't Wake After Hours of Sleep (Hibernates/Powers Off). I've not tested for this w/OS X 10.8.3 however.)

Update: Over the weekend, Kenneth wrote he's had no LED Cinema display or other issues with his i5 Mini using a pair of 1.35v/CL11 sodimms. (Crucial). OWC and Apple oem ram for mini is also 1.35V. (I wrote Larry at OWC about this and he later replied they saw no problems running their 16GB (2x8GB) kit in a 2012 mini.) And on Monday (May 6th) I saw a post in the apple forums from a 2012 mini owner using the same 8GB dimms I have installed (Corsair Vengeance 1.5v/CL10) that after 4+ months of use, one of the dimms failed and then the other. (Later saw another similar report of failures after several months, and frustration over the RMA process.) Mine were a xmas present, bought when they were $80 (for 16GB kit). I'd seen several reports of 1 bad sodimm (out of the box) on these, but you're always much more likely to see problem reports and I can't say what percentage has had failures. (i.e. If their failure rate is higher than normal.)
  

Apple/products related News/Op-Ed: (very light today)


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Updated Apple Support/How-To/Troubleshooting Articles:


  
Other News/Reviews/Alerts/Tech/OT:

  
Recent Articles/Tips/Tweaks/Reviews:
Listing/links of updates to mod/upgrade articles, tips and reviews you may have missed. (Internal Mini-PCIe Card Mods (eSATA/USB 3.0), 2012 Mac Mini SSD upgrades, $250 Mac Pro Dual 3.2GHz Quad-Core CPU Upgrade, DIY OS X Fusion drives, Low-Cost 2006 Mac Mini CPU Upgrades/unofficial EFI updates, 2012 Mac Mini HDMI video problems/display tips/USB 3.0 interference, mods and more)

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Previous Day's News Summary:
    Tuesday April 30, 2013 News Archive
  • OWC announces Envoy Pro EX USB 3.0 Portable SSD (sponsor blog)
  • Belkin announces Availability of Thunderbolt Express Dock
  • TrendLabs warns about more Apple ID Phishing scams
  • Apple's AirPort Products are Targeted in new Patent Lawsuit
  • Apple Planning Six-Part Bond Sale That May Approach Record
  • Updated Apple Support/How-To/Troubleshooting Docs:
    - Troubleshooting AirPlay and AirPlay Mirroring
    - iOS: Using Messages
    - iOS: Understanding the SIM PIN
    - iOS: Wi-Fi settings grayed out or dim
    - iOS: Syncing all-day events w/Outlook may cause events to span 2 days
    - iPhone, iPad, iPod: Resetting iTunes sync alerts
    - iPad: Transferring your cellular data plan to an iPad mini or iPad
    - Xsan: Do not share a specific directory from multiple fileservers
    - About the Apple Fibre Channel Status Indicators (archived)
    - OS X v10.6: DNS search order behavior (archived)
  • Other News/Reviews/Tech/OT:
    - Review: Kingston SSDNow V300 (120GB/240GB)
    - Review: Toshiba Canvio Connect 750GB
    - Kingston MobileLite Wireless Storage Hub Announced
    - Why Big Companies Are Investing in a Service that Listens to Phone Calls
    - Washington Hospital Hit By $1.03 Million Cyberheist
    - Far Cry 3: Blood Dragon Review (Xbox 360)
    - Movie Review: Iron Man 3

For links to older news pages, see the Archives.
  


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