Sli

So I just bought my 2nd Evga 8800gt card Superclocked Edition. I tried running SLI with it and when I enable SLI, I'm only getting 10 fps on 3dmark06. When I disable SLI, I'm getting a much higher fps running just 1 card. Is it some bug with Vista x64? Does anyone have any idea why this might be happening? I've tried everything from reinstalling the drivers to reinstalling the cards themselves. Both cards show up in my device manager and both are bridged. I can't figure out why this is happening. Any help would be greatly appreciated.

Motherboard, BIOS version and power supply, please?

evga 680i mobo, BIOS vers. P32, and a 1000W power supply that is SLI compatible.

What is the power supply?

Hey hex, a quick kinda related question: Where do I go to find out my fps rate? Oh and I sent you a PM with a crysis question.

Press ~ and type r_displayinfo=1 then press enter while in the game.

The reason I'm asking jwood, is that while there may be enough power there, certain power supplies have a problem with the nvidia g92 chipset. Antec TPQ-1000 is one of them. These manufacturers are aware of the problem and usually will replace your power supply.