How much memory can I put in my 15" MacBook Pro

Discussion in 'MacBook Pro' started by Mork, Mar 17, 2009.

  1. macrumors 6502

    Jan 9, 2009
    I have a new 15" (unibody) MacBook Pro running 10.5.6. with 4 GB

    Is it possible to add more memory beyond this 4GB? I read somewhere that I could have 4 GB and a 2GB module = 6 GB.

    Has anyone done this successfully?

    I seem to recall that the max advertised memory amount was 4 GB.

    Thanks for any replies.

    -- M
  2. macrumors 65816


    Oct 26, 2008
    Max advertised is 4GB, but that doesn't mean it can't take more. In fact, if you would have done some search, one of the first threads to show up is a very, very, very (very, very) long thread on this.
  3. thread starter macrumors 6502

    Jan 9, 2009
  4. macrumors regular


    This has been discussed to death. The 15 inch unibody for now can only use max 6 gig of ram successfully.
  5. thread starter macrumors 6502

    Jan 9, 2009
    Sorry about the duplicate post!!!!
  6. macrumors 6502

    Dec 4, 2008
    It could take 6GB (1x2GB and 1x4GB) but it does not wort the upgrade, 4GB modules are very expensive and anyway if you do upgrade to 6GB you lose the dual channel so you actually end up with an slower system with 6GB specially since you will hardly use more than 4GB at any given time (or I am wrong?) If you are looking for performance consider SSD drives after all OS X uses a great deal of virtual memory and the extra performance of SSD over HDD would help a lot (not to mention booting and loading times)
    Take a look at this thread for a cheap SSD:

    or if money is not an issue then take a look at Intel's and Samsungs'
  7. macrumors 603

    Sep 4, 2006
  8. macrumors 601


    Dec 5, 2007
    Yay Area, CA
    without dual channel, an user who does not need or even use the entire 6GB of ram would have a very slight slower experience vs someone with dual channel. However, if your line of work requires the ram, then you'll see a drastic improvement due to the extra 2GB of physical ram.
  9. macrumors 603

    Sep 4, 2006
    I also read in a hardware review where with 8gb of RAM, each core couldnt handle 4gb each that well either. So its kind of a similar situation of the 6GB of RAM as well.
  10. thread starter macrumors 6502

    Jan 9, 2009
    Maybe with 10.6 things will improve?

    I read that 10.6 should be able to actually address 16,000 GB.
  11. macrumors 6502

    Dec 4, 2008
    The thing is that if you would do something that requires that awful amount of ram to begin with (6GB++) you would start by buying a better laptop (definitively 17" that can handle the 8GB and therefore also the dual channel)
  12. thread starter macrumors 6502

    Jan 9, 2009
    Right, agreed.

    When I bought the 15", it had just come out and may be all I ever really need. I really wanted the 17" so maybe in a few months with 10.6 and things stabilize a bit....


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