Why MacBook Pro Core 2 Duo units are limited to 3 GB RAM

“We previously reported that while the MacBook Pro Core 2 Duo can physically accomodate two 2 GB RAM modules for a total of 4 GB, Apple’s specs list the model as able to recognize a maximum of 3 GB of RAM. Today we have some some additional information regarding why the units can only recognize 3 GB, and the questionable nature of other manufacturers’ claims that their Core 2 Duo-based uportables can address up to 4 GB of RAM,” MacFixIt reports.

“The MacBook Pro Core 2 Duo presumably uses Intel’s 945PM chipset, which can physically handle 4 GB of DDR2 RAM. However, a number of items that must be stored in physical RAM space, and when RAM reaches 4 GB, there is some overlap. In other words, in a 3 GB RAM configuration, there is no overlap with the memory ranges required for certain system functions,” MacFixIt reports.

Full article here.


  1. Of course, duhhh didn’t everyone now that? You stupid people! hehehe

    A 2 gig chip is like 6 hundred and somehtign bucks!!!1 Holy shit!!! like I need 2 of them anyway ” width=”19″ height=”19″ alt=”smile” style=”border:0;” />

  2. ApplePi,

    Unfortunately RAM is very expensive at Apple.

    4 gigs of RAM in my MacPro costs $1200.00 US.

    I bought 4 gigs for my PC gaming rig at an electronics superstore and it was only $250.00.

    Both were 4 single gig sticks…:-(

  3. JerryT, you’re not comparing like memory I think.

    I’ve seen DDR2 PC-5300 for $180 for 1Gb, which would be around $720 for 4Gb. A lot less than Apple are charging for it, sure. But there’s no way you could get 4Gb of Mac Pro compatible memory for $250.

  4. New Mac Book Pro can be upgraded up to 4 GB of RAM.

    2 GB free, 1 GB for Mac OS X and 1 GB for EFI and Trusted Computing to watch what your doing.

    EFI = firmware backdoor to our machines from the internet.

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