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New 27" 2010 iMac i7 Memory Issues

I know that numerous people have been experiencing issues with upgrading to 16gb of ram in the new 27" i7's. For some reason, when you have 4 modules installed weird things start to happen. Freezes and random shut downs are the main issues. If you remove two of the modules everything goes back to normal. Here are two threads that talk about it as well.

http://discussions.apple.com/thread.jspa?threadID=2567907&tstart=15
http://discussions.apple.com/thread.jspa?threadID=2576477&tstart=75


I went through 3 different 16gb kits from OWC and all three ended up making my mac randomly shut down for now reason. Total loss of power. If I put the 4gb apple memory back in everything works fine.

Here is a link to the OWC memory - http://eshop.macsales.com/item/Other%20World%20Computing/1333DDR3S16S/

Here is a link to the Crucial memory -
http://www.crucial.com/store/mpartspecs.aspx?mtbpoid=769226C4A5CA7304

Both Crucial and OWC meet all specifications for Apple. I just installed 16gb of Crucial memory today, it came as two 8gb kits. I'm hoping it works but that would defy logic, there is no way that 3 sets of OWC memory were bad. I will keep you posted. It normally takes a good 24-48 hours for the issue to present itself, at least on my machine.

And please post if you are having the same issue, any information will help. Hopefully we can get this resolved.

Thanks

Message was edited by: labeck

iMac 27" Core i7 - Mid 2010 - 16gb Ram, Mac OS X (10.6.4)

Posted on Sep 21, 2010 12:37 PM

Reply
80 replies

Dec 15, 2011 7:53 PM in response to labeck

Im just putting this in, just a theory.


Im running 16GB of GSKILL 1333MHZ ram in my late 2011 Imac fine. These run at 1.5Volt, most ram runs at 1.65Volt. Complete shutting off issues sound like more of a power issue where the inbuilt power supply goes over its limit when 16GB Ram is installed. If it was a memory compatability issue, the mac simply wont boot or lock up.


For example on my PC I went from 8GB to 16GB Ram on a 550Watt power supply tuning on the computer the power supply blew with in 5 minutes, going to a 650 watt its been fine.


I know ram isnt that power hungry, but going to 16gb it seems to use a fair amount of more power.


If it is a lack of power issue, its good to see that at least Imacs have decent power supplys as there will be alot of smoke, sore knees and broken chairs 🙂

New 27" 2010 iMac i7 Memory Issues

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