i have a hercules radeon 9000 64mb card running on a p4 2ghz with 512 megs pc2100 ram, win xp and it runs quite well.
some slowdown with halo, but who doesn't have.
i've completed cod on this pci card with no ill efffects and i'm currently playing XIII............looks and plays a dream.
I can also run the new far cry demo...........with the game settigs turned down
not bad for a pci.
that said next wednesday i'm gettin a new rig
amd a64 3000+
geforce 5900xt
512mb 400mhx ddr ram
80 gb sata hdd
asuskv8 deluxe mobo
i know that this bit is irrelevant but i just had to tell someone (else)
radeon 9000 is a decent performer
best of luck
doddsy