depends on what detail and resolution you have it set at, high detail and 1152x768 resolution would be pretty good, but to achieve framerates of about 60 you would need a fairly good system, better than what your current system could do i think... but i might be wrong, does your motherboard support 4 or 8x AGP? because if it does you probably wont have to make a full system upgrade. 512Mb ram, 9800pro... that should set you up nicely. but you wont get really good performance out of really new games like Doom 3 and farcry, because even with an FX-53 and a gig of ram and a 6800Ultra doom 3 doesnt get crazy high framerates with good detail and resolution.