Using 4GB in 2.33GHz C2D MBP

Discussion in 'MacBook Pro' started by markw10, Jan 23, 2008.

  1. markw10 macrumors 6502

    Sep 4, 2006
    I have one of the previous generation MacBook Pro's, a 15" 2.33 Core 2 Duo. I always have heard that the maximum memory that you can use in these is 3GB, that you could put 4GB in and it would work but would only use 3GB and if I remember right report 3GB in the About this Mac section.
    I have been using 3GB but since a 1GB memory stick reported errors I got a replacement. I read that if you use a 2GB stick it would work as 1GB but work in dual channel mode so would be slightly faster. Since I got a good rebate I ended up buying a 2GB stick and it is 667MHz DDR2 SDRAM.
    I was shocked to boot up my computer and see it reporting 4GB. Since it's reporting it is it using the 4GB or just reporting it as 4GB and only using 3GB? I know I read all of this when Tiger was out so is this because of Leopard that it's maybe working as 4GB?
  2. djinn macrumors 68000


    Oct 4, 2003
    OS X shows 4gig? That would be strange cause the chipset only supports up to 3.3gig.
  3. heatmiser macrumors 68020

    Dec 6, 2007
    Leopard shows 4gigs, but it's really only using 3 (or 3.3, whatever). You still get the dual-channel bonus, though, so it's not a bad idea.
  4. djinn macrumors 68000


    Oct 4, 2003
  5. capitanbuzo macrumors 65816

    Jul 17, 2007
    Yeah, Leopard will show 4GB but will only use 3.3GB like the others have said.
  6. DaLurker macrumors 6502

    Mar 30, 2006

    The OS reads 4gb, but if you load up Activity Monitor, you'll notice memory is maxed out at 3gb :)
  7. gotzero macrumors 68040

    Jan 6, 2007
    Mid-Atlantic, US
    I have 4GB in mine. System trackers show 3.0GB.

    Regardless, I have as much dual-channel RAM as possible.

    It is so cheap, why not do it...

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