Supreme Commander (DirectX 9)
This real-time strategy game boasts an incredibly beautiful graphics engine that really stress our GPUs here as well as being one of the first games to be really multi-threaded as well.
Supreme Commander is a very CPU-heavy game and as such performance between the GTS and GT cards from XFX are very close. The SLI performance numbers are even more disappointing than the last set. There was no gain at 1280×960 and a NEGATIVE gain (losing performance) at 1600×1200. My guess is that the SLI processing overhead is diving into the CPU cycles the game needs and thus performance drops slightly.
Update: NVIDIA has alerted us to a possible solution to this SLI performance issue by disabling the Vsync option via the NVIDIA Control Panel instead of in the game menu. I am away from the test bed current but when I return I’ll be sure to double check these results and update them if necessary.