First we face off the 2 CPUs in single card mode:

6 NVIDIA Forceware 81.26 Beta: Single Core vs Dual Core

It seems that these new beta drivers does nothing much for single card configurations
in 3D Mark 05.

Now, we go on to SLI configuration.

5 NVIDIA Forceware 81.26 Beta: Single Core vs Dual Core

With the 77.72 drivers, it seems that the Dual Core @ 3.0Ghz is actually slower
than the single core @ 3.0Ghz. However,when we switched over to the 81.26 drivers,
the performance of the Dual Core went up by 12% while the performance of the
single core remains unchanged. The Dual Core @ 3.0Ghz is faster than the Single
Core @ 3.0Ghz by 6%.

Interesting thing to note is that scores are slightly worse off with Hyper-Threading
enabled for both drivers, which is quite common knowledge for those who benchmarks
3D Mark 05 quite a bit. The tests were therefore ran with Hyper-Threading disabled.