We tried to overclock the EVGA GeForce GTX 680 SC SIG 2 with the Power Target set to the maximum of 125%. We let the fans in auto mode as increasing fan speed made no difference here. We only managed to increase the base GPU clock rate by 30 MHz (GPU clock is overclocked in incremental 10MHz steps), and the memory clock rate by 200MHz (GDDR5 effective 800MHz).  This is not much overclocking for the GPU but bear in mind that the EVGA GTX 680 SC SIG 2’s GPU is factory overclocked by 92MHz. With the help of a decent memory overclock we got up to 5% better results.