Benchmark Results: DiRT 3 And StarCraft II
DiRT 3
DiRT3 favors the new build by a bit, particularly at lower graphics detail settings. But at that point, frame rates are high enough that it doesn't really matter.
At Ultra quality settings, both machines are pretty comparable, achieving more than 50 FPS at 2560x1600, even with 8x MSAA applied.
StarCraft II
It should be no surprise that, in StarCraft II, the results are quite close.