GameSpy managed to corner a big chunk of the id Software team for interviews. Their interview with John Carmack has the latest dirt on graphics cards for DOOM:
Based on the feature set, the Radeon 8500 should be a faster card for Doom than the GF4, because it can do the seven texture accesses that I need in a single pass, while it takes two or three passes (depending on details) on the GF4. However, in practice, the GF4 consistently runs faster due to a highly efficient implementation. For programmers, the 8500 has a much nicer fragment path than the GF4, with more general features and increased precision, but the driver quality is still quite a ways from Nvidia's, so I would be a little hesitant to use it as a primary research platform.So the Radeon 8500's pixel shaders ("fragment path") are superior, but NVIDIA's drivers win the day. However, ATI's next-gen hardware powered the E3 DOOM demonstrations.
You'll find more from The Carmack in this interview at Gamers.com. GameSpy's inteviews with the rest of the id crew are here and here. Also, GameSpy has "hands-on" impressions of DOOM III. Thanks to the Shack for all the linkage.
Oh yeah, and a demo of Unreal Tournament 2003 is due in a few weeks. Time to pick a new video card?