I am a mac newbie, but have been using been a pc user for years. I am not sure what kind of driver support nvidia or ati cards get on the mac, but as for as the hardware, the geforce 3 is in a league by itself. There is nothing that comes anywhere close to the graphics horsepower the geforce 3 has. I have a geforce 2 in my powermac g4 and also in my dell p4. I have also had 3dfx cards and a number of ati cards for the pc. The Nvidia cards are far superior for 3d, and are very capable 2d cards. The geforce 2 in my powermac runs greats. I don't know what directx8 has to do with mac, but nvidia worked very closely with microsft on directx8, and the geforce 3 should be better supported. If price is not an issue, as far as hardware goes, the radeon doesn't compare to the geforce 3, it is not even in the same league.