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my computer won't allow for 4 gigabytes my resaerch says... i have a core duo macbook pro.
You can install it and it'll use upwards of 3.3gb of it, OS X uses PAE just like windows with it's x86 version on the Core Duo.
That's not the limitation he's facing. As is the case with my 24" iMac, it's the chipset that's limiting the RAM. I can install 4GB but the chipset used on the motherboard will only address 3GB. There would be a full 1GB that will never be detected.