With all the discussion lately about how Half-Life 2 will run on ATI hardware
compared with NVIDIA accelerators,
BonusWeb.cz
shot off an email to id Software's John Carmack to ask how DOOM 3 and other
games are likely to be impacted by the difference between the two graphics
platforms running DirectX 9. Here's how he responded:
Unfortunately, it
will probably be representative of most DX9 games. Doom has a custom back end
that uses the lower precisions on the GF-FX, but when you run it with standard
fragment programs just like ATI, it is a lot slower. The precision doesn't
really matter to Doom, but that won't be a reasonable option in future games
designed around DX9 level hardware as a minimum spec.