Call of Duty uses pixel shaders, which until now were limited to DX games. Doom 3 is rumoured to be using pixel shader FX , and since the next generation of games will be using the Doom 3 engine investing in a Pixel shader 2.0 Vcard will be an investment in ALL the new games.
Pixel shader 2.0 cards:
Radeon 9600
Radeon 9800
Radeon 9800XT
Radeon 9700
Radeon 9500
Geforce FX 5950
Geforce FX 5900
Geforce FX 5700
Geforce FX 5600
Pixel shader is used to create lapping water effects, to create blurred reflections and for colouring reflective surfaces . No doubt they will have new uses, pixel shaded eyes? pixel shaded light refractions?