Supreme Commander prefers AMD's graphics architecture, but a bit of brute force helps the overclocked $5,000 pace the $1,250 system at high resolutions.
The game gets more unfavorable towards Nvidia when AA is enabled, with embarrassing frame rates for all but the $1,250 configuration. The $625 system also used AMD graphics, but appears to be significantly handicapped by its slow CPU.
All systems appear CPU-bound under World in Conflict. The overclocked $625 PC supports all resolutions smoothly when AA and AF are disabled, but enabling those settings requires a step up to the $1,250 configuration.