Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
The OEM Apple RAM is 1.5V. The Intel Ivy Bridge i5/i7 CPU memory controllers are designed for 1.5V RAM, but will run stable with 1.35V. If you mix 1.35V and 1.5V RAM, it will run at 1.5V, which will not harm the 1.35V RAM, although it's best not to mix voltages.
 
Thanks for the replies!
So indeed the correct replacement ram to buy would be the corsair vengeance which is 1.5v?
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.