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After upgrading my MacBook to 8gb, I had 2 x2gb sticks and thought what the heck. Now my iMac has 8bg, utilizing the 4gb that it came with plus the 2 x2gb from my MacBook.
Weird configurations seem to work fine.
 
Interesting thread! :D

I've just taken delivery of a 27" 2011 i5 Quad Core iMac, with 4GB of RAM (2x2GB).

I have 8GB of PC DDR3 RAM sitting here doing nothing.

Is Apple RAM the same as PC RAM?

If so, can I remove the 2 x 2GB stick I have in my iMac and replace them with 2 x 4 gig sticks?

[Edit] - According to Crucial, the iMac has 4 x slots and can take a max of 16GB: http://www.crucial.com/uk/store/lis...uad-Core i5 (27-inch - DDR3) Mid 2011&Cat=RAM

So maybe I could add the 8 gig I have, to the 4 gig that's in there? :eek:
 
Also have a 2011 27 imac. i just bought 2x4gig and added it to the 2x2gig, so 12gig in total, no problems.
 
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