A youtube video I saw recommended RAM that's 1.5V but I thought I recalled hearing the 2012 iMac suppports 1.35V.
Also, does this make any difference beyond electricity savings?
iMac (27-inch, Late 2012), OS X Mountain Lion (10.8.2)
Posted on Dec 21, 2012 11:23 AM
Q: Does the 2012 iMac use 1.35V or 1.5V RAM?
Either voltage will work. Without knowing the power consumption (not voltage) of the part its power use can not be estimated.
Just buy from a good quality vendor, OWC or Crucial are the best.