I have not run into this before...I have two 8800 GTX cards that I have in the past run in SLI, but now can't seem to get them to do so. It shows both cards in gpu-z but no option to SLI in the control panel. I have tried three different drivers to no avail. I even replaced the bridge with no effect...any ideas?
EDIT: Now I can't even enable PhysX in the control panel even tho it clearly shows it enabled in gpu-z...geez, why always me?