1.5V vs. 1.35V Crucial Ram kit for the 2011 MacBook Pro

[Titanium81]

I want to do a 8GB Ram upgrade on a 2011 MacBook Pro.

Crucial has two kits available.

MacBook Pro 2.3GHz Intel Core i5 (13-inch DDR3) Early-2011
http://www.crucial.com/store/listpa....3GHz+Intel+Core+i5+(13-inch+DDR3)+Early-2011

8GB Kit (4GBx2)
DDR3 PC3-10600 • CL=9 • Unbuffered • NON-ECC • DDR3-1333 • 1.5V • 512Meg x 64 • Part #: CT1895171

and

8GB Kit (4GBx2)
DDR3 PC3-10600 • CL=9 • Unbuffered • NON-ECC • DDR3-1333 • 1.35V • 512Meg x 64 • Part #: CT2336212

Which one is better? And why is there two types? Would using the 1.35V get better battery life or have less performance?

 

[dusk007]

Performance on these two is exactly the same.

I don't know what the impact on battery would be, but in theory at least it should prolong battery life. The RAM needs less power something around 30%. IMC may run at the lower V too which may also help.
I haven't heard of anyone trying to stuff those into a MBP yet. Doesn't mean it won't work.
Officially Intel only supports DDR3L or 1.35/1.25V RAM with Ivy Bridge. I know it works on Desktop Mainboards already without any problems.
If you give it a try, some power consumption numbers when running benches before/after would be interesting. Those read out by istat on battery would be good enough.

Next Gen MBP will most likely come stock with DDR3L RAM.