As mentioned before in the specifications, the GPU clock runs at 325 Mhz, and the memory runs at 550 Mhz. I was able to boost the GPU up to 360 Mhz, and the memory to 650Mhz stable, a 35 Mhz overclock on the core, and a 100Mhz effective overclock on the ram (it's actually only a 50 Mhz overclock on the ram, but because the card uses DDR RAM, it is treated as an effective 100 Mhz).