If its an old mobo, maybe there is something to do directly on the mobo, like flipping a bridge. Newest only need you to install card and have fun
We'll ill tell you what i had to do to get my sli to work on my i7 build with my 280 HC16's.
- First step Uninstall all drivers and files (where you zipped the nvidia files). - Shut down - Before starting up unplug the sli bridge. to make sure i unplug my 2nd videocard. - Than Turn on & reinstall the drivers. - Shut down. - Replug in the sli bridge and power. - Turn on. Once it's loaded right click > Nivida preferences and select advanced. It should have Sli option in the left hand Conner under phyx's
Fresh system. Haven't even turned it on yet to be honest. PSU brand new seems to be broken. >.<