At least as important - maybe more so - is the processor. If you want to enjoy GP4, you need to have the benefit of the delicious graphics and the power to operate all that with the physics etc. I upgraded to AMD 2400+ XP, before buying the game. I now also have a new Radeon 9700 pro. This means get excellent graphics with´most at max and good performance with 1280x1024 and 34-37 fps. It is that demanding. It is bad programming but it is a beautiful and totally addictive game. Oh.. and great forum, but you don't need to play the game to particiapte.
Larry
AMD 3000+,Epox EP-8RDA,Ram 1536mb 333 DDr, Rad 9800 pro omega 2.4.96, dx9b, Audigy, MOMO FF,winxp