I've got a Macbook Pro. Its the 2.4Ghz, 2gb Ram, 15" Screen, 8600m GT version.
Anyways... While in Mac OSX, it says my video card is a 8600m GT 256mb Version. However, when I load up into Windows through bootcamp, the nvidia Driver says I have a 512mb version. Dxdiag also confirms a 512mb...