NVidia and ATI design the GPUs and contract out the manufacturing of them, but only ATI sells their own 'brand' cards. NVidia doesn't produce it's own cards (besides the engineering sample and reference cards that they send away). XFX, Sapphire, BFG and the like are partners that buy the GPUs and put them on a card that is usually identicle to the reference card but with their own cooler and sometimes overclocked.Well, the way I see it, GeForce and ATI are the Main card makers