From past experience, we understand that the Tahiti XT GPU showed its tesellation performance against NVIDIA GeForce GTX 680, edging out the latter with thin margin and only at the most demanding test scenario. In its 2-way CrossFire setup at the highest resolution with anti-aliasing set at 8x, our past observation repeated itself as the pair of Southern Island cards came up to be 10% higher in its scores against the Kepler pair.
In terms of their scaling margins, the difference between the AMD Radeon and NVIDIA GeForce cards was not as pronounced when compared to other benchmark tests. At the resolution of 2560 x 1600 pixels and at highest settings for the benchmark software, both set of cards scaled at roughly 100%. At the lower settings for the benchmark, the Radeon CrossFire setup scaled up by about 88% while the NVIDIA camp showed a margin of roughly 95%. The good scaling results are partly because of the benchmark's synthetic nature, which tend to make good use of a GPU's available resources.
With GPU Boost working to put the clock speeds of both the GPUs in SLI setup to their maximum observed core clock speeds throughout the duration of the benchmark, the pair of Kepler GPUs fell short to beat the pair of cards from AMD at the highest test setting.