Dual 760s will outperform 770 easily, but many SLI and Crossfire users have experienced microstuttering below 30fps, which is quite irritating. In my suggestion go for a 770. You can easily get 50plus fps in 1080p inmost of modern titles using it.
Comparision-760vs770.
In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTX 770 are noticeably better than the Nvidia GeForce GTX 760.
The GeForce GTX 770 has a 66 MHz higher core clock speed and 32 more Texture Mapping Units than the GeForce GTX 760. This results in the GeForce GTX 770 providing 39.8 GTexel/s better texturing performance.
The GeForce GTX 770 has 1024 MB more video memory than the GeForce GTX 760, so is likely to be much better at displaying game textures at higher resolutions.The GeForce GTX 770 has 32 GB/sec greater memory bandwidth than the GeForce GTX 760, which means that the memory performance of the GeForce GTX 770 is noticeably better than the GeForce GTX 760.
Therefore 770 is a better performer in gaming and video editing.
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