GPU Boost is an important factor in the entire GTX 600 series, since it controls how much and when to auto-overclock the GPU. Below you’ll find GPU clocks we got playing Metro 2033 at 2560x1600. Base clock is the guaranteed clock while Boost and all other clocks depend on whether the GPU is working too hard, whether thermals are fine and whether consumption is optimal. EVGA GTX 680 SC Signature’s Base clock is 1085MHz, Boost is 1150MHz. As you can see, clocks went up to 1201MHz. GPU Boost is good because the chip was used to the max and users don’t have to mess with overclocking since the card is already doing it itself.