We should note that, though Cinebench doesn't actually benefit from multi-GPU configurations currently, we did test the systems with the technology enabled. You can see the CPU scores are all pretty tight between the configurations but perhaps AMD has been a bit more diligent on tuning drivers for this application versus NVIDIA.
Futuremark 3DMark 11
Synthetic DX11 Gaming Performance
||The latest version of Futuremark's synthetic 3D gaming benchmark, 3DMark11, is specifically bound to Windows Vista and 7-based systems because it uses the advanced visual technologies that are only available with DirectX 11, which isn't available on previous versions of Windows. 3DMark11 isn't simply a port of 3DMark Vantage to DirectX 11, though. With this latest version of the benchmark, Futuremark has incorporated four new graphics tests, a physics tests, and a new combined test. We tested the graphics cards here with 3DMark11's Extreme preset option, which uses a resolution of 1920x1080 with 4x anti-aliasing and 16x anisotropic filtering.|
M18x - AMD Radeon HD 6990M CrossFire
M18x - NVIDIA GeForce GTX 580M SLI
3DMark 11 is squarely targeted at gaming performance obviously and we felt it best to give you the direct results page data in each of the tests as well. As you can see it's a nip-and-tuck battle between the two M18x configurations, though versus the rest of the field it's a total blowout for the M18x. Note multi-GPU scores are nearly two times that of their single GPU scores with the M18x, though in this test, AMD's CrossFire setup seems to scale a bit better.