I have Two sli 980 GTX SC both cards seem to work separately with ok frame rates but when in SLI frame rates drop 50%. Tried new drivers with clean install. Cant think of anything else. I have made sure the SLI bridge in on correctly. I have enabled SLI in driver. Tried different games with same resultants. Frame rates about 39 to 40. With out SLI I get 40 to 50. Both cards show in driver. What gives? Am I missing something?? Have not used SLI in a long time.
Also my system: I have an intel I7-3770 at 4634 Mhz 16 gigs of ram a very cool case and lots of power. Asus z77 board. Any help would be appreciated.

Signed, Very disappointed.