I have a MSI K8N SLI (series) x2 7800gt windows is updated, directx is updated, bios is not, but it only fixes a reboot problem, ive installed the newest videocard drivers 91.31 and enabled sli, and selected multi GPU mode in the nvidia setup. so when I run 3dmark05 I can see a slightly performance in sli, (35FPS at the very start of the bench, and 22FPS in Single GPU mode) so it works here, sort of... In these games there is no or even lesser! performance in sli mode: Battlefield 2, warcraft 3, Counterstrike, counterstrike source, Prey, Quake 4 demo. Why doesnt my sli system work properly?