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

Discussion in 'MacBook Pro' started by Titanium81, Oct 17, 2011.

  1. Titanium81 macrumors 6502a


    Jun 23, 2011
    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

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


    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?
  2. dusk007 macrumors 68040


    Dec 5, 2009
    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.

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