Overclocking the GeForce GTX 770
We also spent a little time overclocking the EVGA GeForce GTX 770 SC w/ ACX to see what kind of additional frequency headroom it had left under its hood. For these tests, we used the latest edition of EVGA's Precision X GPU tweaking utility, which is designed to work with NVIDIA's GeForce GTX 700 series products.
Overclocking a Kepler-based GeForce GTX series graphics card requires a bit more tweaking then previous-gen products, due to all of the new options available and the complexities associated with GPU Boost 2.0. Sometimes, you’ll find that increasing a particular voltage or frequency may appear to function properly, when in fact performance decreases due to errors or throttling. You may also find that the actual GPU Boost clock may travel above or below the designated offset value when the power and/or temperature targets are also increased.
We did a few things when experimenting with overclocked speeds on the EVGA GeForce GTX 770 SC w/ ACX. First we tried the most basic option available--we simply changed the temperature target from the default 80'C and increased it to 94'C to see what kind of impact it would have on performance. Then, to push things much further, we increased the power and temperature targets to 106% and 94'C, respectively, and also increased the GPU and Memory clock offsets and ran a few tests.
Ultimately, we were able to take the EVGA GeForce GTX 770 SC w/ ACX's GPU clock up to 1333MHz, from its default of 1163MHz, and boost its effective memory frequency up to 7204MHz, from 7010MHz stock. At those clocks, the card exhibited better performance across the board; Alien vs. Predator and Hitman showed improvement of 4.3% and 8.5%, respectively.