DOOM 3 & DX9 [Sep 17, 2003, 7:08 pm ET] – Share – Viewing Comments
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.
" I wonder how the cards would match up against each other if the FX ran FP24, or the Radeons ran FP32."
hard to say as radeons cant do fp32 and the fx can't do fp24 either. i think it is more interesting seeing how while the radeons do run in fp24, the fx cards have to scale back to fp16 and even fx12 just to be remotely competitive. another interesting piece of trivia is the fact that sofar it seems that the 5900ultra running fp32 is about equal to the 9600pro running fp24, yet costs over twice as much.
hard to say as radeons cant do fp32 and the fx can't do fp24 either. i think it is more interesting seeing how while the radeons do run in fp24, the fx cards have to scale back to fp16 and even fx12 just to be remotely competitive. another interesting piece of trivia is the fact that sofar it seems that the 5900ultra running fp32 is about equal to the 9600pro running fp24, yet costs over twice as much.
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