Even with the power of the AMD Athlon X2 and Intel Extreme Edition processors, we still find ourselves hitting a CPU limitation in a lot of our benchmarks. That is, the graphics cards have more performance to give but the processor is letting the team down.
By overclocking the processor we can see what kind of a performance increase we get. When something isn't CPU limited the performance increase isn't all that major but when we do have a CPU bottleneck, every MHz extra we can get can show us an excellent jump in performance.
The Athlon X2 3800+ was increased from 2GHz to 2.2GHz with a slight increase in the front side bus utilizing the stock X2 heatsink fan.
On both setups we see small increases at 1024 x 768 but greater increases at 1600 x 1200.
We see minor increases in both setups at both resolutions.
SLI shows a superior increase in performance once overclocked with it standing out from the rest of the results.