Is there a performance hit for mixed DIMMS?

Discussion in 'MacBook Pro' started by profBIll, Aug 1, 2007.

  1. profBIll macrumors newbie

    Joined:
    Mar 13, 2007
    #1
    2Gb in my SR MBP is proving to be a little less that I need, especially for parallels. I was thinking of buying just a single 2Gb stick, replace one of the 1Gb sticks, to get a total of 3Gb.

    My question was whether there is a performance hit to have mixed DIMMs in the system? Anybody seen a performance loss with 3Gb of memory? Any help appreciated.

    >>>bill<<<
     
  2. mad jew Moderator emeritus

    mad jew

    Joined:
    Apr 3, 2004
    Location:
    Adelaide, Australia
    #2
    It almost certainly won't be a performance hit if you're finding 2GB isn't enough RAM. The benefits of having enough RAM versus having slightly faster matched chips are much greater. :)
     
  3. CanadaRAM macrumors G5

    CanadaRAM

    Joined:
    Oct 11, 2004
    Location:
    On the Left Coast - Victoria BC Canada
    #3
    Your hit for giving up dual-channel will be about 6%
    Your gain on having more RAM will depend on how you use the machine --

    if you are regularly exceeding 2 Gb RAM now and paging out to the hard drive, then you might see as much as 20% gain.

    If you operate now entirely within 2 Gb and close programs religiously when not in use, and your don't see any PageOuts, then you may not see any gain from the extra 1 Gb.
     
  4. docc macrumors 6502

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    Jun 19, 2007
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    Miami
    #4
    I'm using 2.5GB RAM on my macbook and the performance is MUCH higher in comparison to stock 1GB RAM it came with.
     
  5. vicious7 macrumors 6502a

    vicious7

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    #5
    I also started getting pageouts with all the software I was running concurrently so I went up to 4Gigs. And I'm now much happier. OWC has some good deals on matched sticks.
     
  6. vicious7 macrumors 6502a

    vicious7

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    #7
  7. profBIll thread starter macrumors newbie

    Joined:
    Mar 13, 2007
    #8
    That is exactly what I wanted to know. Thanks very much to everyone who chimed in.

    >>>bill<<<

     

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