Even though it has high clock rates by default, the GeForce GTX 770 turns out to have high overclocking potential. We managed to increase the GPU and memory frequencies of our sample by 135 and 960 MHz, respectively, without any stability or image quality issues.
The resulting clock rates were 1181/1220/7872 MHz:
The GPU clock rate would peak up to 1267 MHz during our overclockability tests, which would have been a fantastic result any GeForce 6 series card. And here we've reached it with the very first sample of GeForce GTX 770!
It must be noted that we overclocked our card at 75% fan speed, which was 3210 RPM. So we didn’t have to worry about its temperature:
We measured the power consumption of our testbed equipped with different graphics cards using a multifunctional Zalman ZM-MFC3 panel which can report how much power a computer (without the monitor) draws from a wall outlet. There were two test modes: 2D (editing documents in Microsoft Word or web surfing) and 3D. In the latter case the load was created by four runs of the introductory “Swamp” scene in Crysis 3 game at 2560x1440 with maximum image quality settings, but without MSAA.
The Nvidia GeForce GTX 770 is compared in this test with the ASUS GeForce GTX 680 DirectCU II TOP (at the standard GeForce GTX 680 frequencies), reference Nvidia GeForce GTX 780 and HIS Radeon HD 7970 IceQ X² GHz Edition:
The GeForce GTX 770 configuration needs 40 watts more than the GTX 680 system at peak loads, yet remains more economical in comparison with the Radeon HD 7970 GHz Edition. The difference from the GeForce GTX 780 is 34 watts and shrinks to 13 watts when the GeForce GTX 770 is overclocked. Any of these configurations can be powered by a 550-600-watt PSU.