Hey, I recently built a new rig with two 680's in SLI and the performance has been terrible. In Heaven 3.0 I only get scores around 1500-1600. Im using the 301.42 drivers on a clean install. 

note: This still occurs at stock clocks
The cards are both watercooled and run at less than 45 degrees.
System Specs:
i7 3820 Oc'd to 4.4
Asus x79 sabertooth
Zotac gtx-680 SLI +155/+475
16gb Corsair Dominator 1866mhz 9/10/9/27
note: This still occurs at stock clocks
The cards are both watercooled and run at less than 45 degrees.
System Specs:
i7 3820 Oc'd to 4.4
Asus x79 sabertooth
Zotac gtx-680 SLI +155/+475
16gb Corsair Dominator 1866mhz 9/10/9/27

















