aussiewilly

My 866 with radeon8500 plays zero hour fine, my 3gig with radeon9600xt lags and stalls, frame rates are unplayable. Ive tried it patched and unpatched. I can play Doom 3 and many other games with all the bells and wistles up full. So why would my old 866 play Gens/ZeroHour better than my new 3Gig?? Intel 800fsb P4 3ghz 1024 Ram 128gig ATI 9600xt Please help. Thanks in advance.