Crysis 3 (DirectX 11)
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Results in Crysis 3 are VERY close in both single GPU and dual GPU testing with the R9 290X and the GTX 780 going stride for stride. I would give the advantage to NVIDIA here though as the frame time variance in SLI is obviously more consistent (and without as many spikes and hitches) than CrossFire.
Well that changes things. At 3840×2160 the R9 290X is clearly faster than the single GTX 780 and with multi-GPU that difference scales even further. Frame times are much lower with the Radeon cards in CrossFire, and even though the variance is higher than we would like, the result was a solid overall experience even with Very High image quality settings.