I picked up a X850XT a few days ago in preparation for a new s939 system I'm building, which includes a A64 Venice 3000+ and PCI-e motherboard, but I currently have a s754 Sempron 2800+ and a gig of PC3200 RAM already. I'm looking to play BF2 and HL2/CS:S mostly. Could the Sempron even keep up with a X800XTPE if I were to just go with that? I'm considering selling the X850XT if it would work just great to stick with the AGP card.
