The factory-overclocked GeForce GTX 770 is expectedly faster than the reference card from Nvidia and somewhat slower when the latter is overclocked. The 2-way SLI configuration built out of two overclocked GTX 770s is 76% faster than the single such card and always ahead of the dual-processor GeForce GTX 690, which is overclocked, too.
Unigine Valley Bench
We can see the same standings here as in the previous test but the 2-way SLI configuration is more efficient, enjoying a larger advantage over the GeForce GTX 690.
Metro 2033: The Last Refuge
The SLI tandem of GeForce GTX 770s performs well in this game, being 91% faster than the single card and having no problems in terms of bottom speed. It is easily ahead of the dual-processor GeForce GTX 690.
Total War: SHOGUN 2 – Fall of the Samurai
The 2-way GeForce GTX 770 SLI configuration is good in Total War: SHOGUN 2 – Fall of the Samurai, too, especially when we turn on antialiasing (+94% compared to the speed of the single card). We don’t see any problems with bottom speed which can often be observed with multi-GPU configurations. The GeForce GTX 690 is slower than the SLI tandem, which, incidentally, costs less. The standings of the single cards won’t change in the remaining tests.
Excepting the CPU-dependent settings at 1920x1080, we can see the same standings in Battlefield 3: