I dunno if its just software, but this is getting very agrevating. I have an older system, A64 X2 firstname.lastname@example.org, 1024x2 OCZ PC4000, on DFI NF4 SLI-DR mobo with OCZ 850w GameExtreme(also got for free cause my old 520 died). I had bought an 8800 GTS 640 mb when the 8 series first came out, and recently got another one(it was a present so i didn't pay anything for the second one). Poped it in, reinstalled os with latest forceware drivers and everything. Changed the jumpers on my mobo to sli mode. COD4 runs amazing, i get 50-90 fps on all the missions with all settings max including AA and ANISO. But in UT3 i get horrible performance, especially by portals, it gets really choppy even if its at 40~50 fps it stutters, then when action starts by portals it drops to 30-20 fps range. I see NO imporvement in crysis except for a few parts where it spikes to 50 with all high, but normal play NO difference at all. I have both games pachted to latest. Any ideas? I don't think my CPU could be THAT much of a bottle neck that it would negate addinga second card. I should see some improvement because I do bigtime in COD 4. I also have a second system with Opteron 185, 2gb ram, 8800 GT 512, it runs WAY better and faster than my two GTS sli'd, but according to all the benchies i've seen two GTS's slid are about 25~45% faster than a GTX which is faster than a GT, so something isn't right.