Gigabyte also includes software to overclock and change fan curve.
I did however choose to use the latest beta of MSI Afterburner to test the Nvidia o/c-scanner and see how high it could go. Running thescanner on the default settings yielded a curve where we got a average clockspeed of 123 MHz and a memory overclock of 200 MHz.
Next I increased the power target to 100% and ran the o/c sanner. This actually yielded a lower overclock so I went back to the first and then just increased the power target to 107% (wanted to keep the mex at 375W).
Overclocked + 107% power target
15822 / 18545
16187 / 19294
16224 / 19388
3DMark Timespy Extreme
8062 / 9543
8329 / 10015
8412 / 10163
3DMark Port Royal
565 / 229 sekunder
565 / 230 sekunder
While there are some increases in performance they are small, around 2-4% maximum. At the same time the power draw increases up to 373 Watt (with 110% power target I saw it even increase to 383 W) and I am not sure it is worth it as you generate more heat that needs to be transported away.