NVIDIA GeForce GTX 770 Review @ Vortez
 

While the GTX770 is not a direct replacement for the GTX680, it makes sense to compare against this card than the card NVIDIA pitch it as replacing, the GTX670 because of the similarities. For those looking to upgrade from a GTX670 or a GTX570, NVIDIA claim increases in performance of 22% and 65% respectively. How this performance increase transpires when pitched against the GTX680 we will examine in our performance benchmarks.

http://www.vortez.net/review.php?id=733