RAM upgrade and forward compatibility.

Discussion in 'MacBook Pro' started by yetanotherdave, Apr 1, 2011.

  1. yetanotherdave macrumors 68000

    yetanotherdave

    Joined:
    Apr 27, 2007
    Location:
    Bristol, England
    #1
    I have a 2009 MBP (in sig) which currently has 4GB of 1066mhz ram.
    I want to upgrade to 8gb.
    A 8gb 1066mhz kit costs the same as a 8gb 1333mhz kit.
    If I get the 1333 kit, will it just run at 1066mhz in my machine, and what happens to the latency? I read somewhere it might run at the better CL7 when at 1066mhz instead of CL9 at 1333MHZ.

    There is a reason for doing it this way, before you all suggest getting the 1066Mhz ram. My wife has the 2011 mbp with a 4gb 1333mhz kit. When I upgrade my mbp (probably after the next 2 revisions, by then it will likely come with 8gb preinstalled) I want to be able to give her the 8gb RAM from my machine. If I have the 1333 kit already she wont lose any speed.
     
  2. marc11 macrumors 68000

    Joined:
    Mar 30, 2011
    Location:
    NY USA
    #2
    You plan will work fine, the ram will run at 1066 in your computer and then 1333 in the newer one. However I would compare prices since you will pay a little more now for the 1333 and come a year or so down the line that 1333 ram may be pretty cheap...
     
  3. yetanotherdave thread starter macrumors 68000

    yetanotherdave

    Joined:
    Apr 27, 2007
    Location:
    Bristol, England

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