8800 GTX SLI Issues...

The story:

Decided to augment my graphics performance by adding a second 8800 GTX to my system. Seemed like a very good idea at the time.

However after wiping out all my old drivers including Nforce (Driver Sweeper in Safe Mode too), then installing the second card, I've found that GPU # 2 no matter which one is installed appears not to be used. EVEN though Nvidia Control Panel says SLI is enabled.

Benchmarks DO NOT reflect any improvement,

Still only getting 13K in 3dMark 06 (Which says i only have 1 GPU too)

Source SDK Base Stress Test averages a mere 111 FPS


I am kinda at a loss, SLI simply dosn't seem to be doing it's job.

System
AMD Phenom 9850 BE
Gigabyte GA-M57SLI-S4 Nforce 570A SLI
HEC Zephyr 750W PSU (SLI Certificated)
1x EVGA 8800 GTX
1x XFX 8800 GTX
4gb DDR2 800Mhz


I noticed this problem when using RIVA Tuner to monitor my GPU temps during a run of 3dMark. the second card never increased in temperature during the run. I do not have cooling THAT good, especially when the other GPU jumped 15 degrees.

Please help!