i can't say if these are compatible with your mobo but i recently went from 1.9 xp athlon, 64mb ti4200 and 512 mb ddr ram to 9700pro, 2.4 xp athlon and 768 ddr ram. ut2003 runs unbelevibly well in 1024x768, RoCW runs well in almost all resolutuions i've tried. funny enough the only game i can't really max the settings on at 1024x768 is MohAA. the 2.4 athlon is not top of range but with the 9700pro it flies.
hope this helps