Can MBP 2012 use 1333MHz ram???

Discussion in 'MacBook Pro' started by negativzero, Apr 8, 2013.

  1. negativzero macrumors 6502a

    Jul 19, 2011
    Apple is sending me a new 15" 2012 MBP after my 2011 MBP was determined to be irreparable. I want to know if I can pop in my 8GB Crucial rams into this MBP or do I have to purchase new 1600MHz sticks?
  2. biggles3500 macrumors newbie

    Sep 9, 2012
    I am currently using 8gb 1333mhz DDR3 in my 2012 macbook pro 15" after being in the same situation as you, also from crucial.
  3. negativzero thread starter macrumors 6502a

    Jul 19, 2011
    So they work perfectly? Does the OS crash often?
  4. Ccrew macrumors 68020

    Feb 28, 2011
    If you have an issue with the machine, apple will potentially point at the below spec memory as an issue - sometimes even if it's not. While it's considered user replaceable expectation is it's the right spec.

    While it should run, it'll hold the bus clock down. Peak transfer rate on 1333 is 10667mb and on 1600 it's 12800mb. And you effectively lose 267 transfers per second in the bus.

    From there it's a matter if the latency and CAS timings are the same. If it were me, I'd go with the correct spec, but what you have may well work.
  5. biggles3500, Apr 8, 2013
    Last edited: Apr 8, 2013

    biggles3500 macrumors newbie

    Sep 9, 2012
    In the 4 months I've had the machine its been fine, but as Ccrew said there is technically less performance, but I doubt you will notice a difference in normal usage. You could always try it out and if you have problems just order the 1600mhz ram from crucial.
  6. Giuly macrumors 68040


    Generally, 1333MHz has a CAS timing that is lower and CL9 is as fast as 1600MHz CL11. However, there is the Kingston HyperX Plug'n'Play, which is 1600MHz CL9 and faster than your 1333MHz RAM or Apple's stock RAM.
  7. cosmicjoke macrumors 6502

    Oct 3, 2011
    Portland, OR
    my little headless 2012 mac mini server has been using 8gb of ram from my late '11 mbp for months without issues, it does tons (afp, nfs, itunes server, znc, transmission, sabnzbd, plex media server, ssh, handbrakecli to name a few things off the top of my head) - i think it will be just fine.

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