I've recently bought a Sapphire HD 5770, and I've started overclocking it using Catalyst Control Center. The stock speeds are: Clock speed - 850Mhz Memory speed - 1200Mhz So far I've been able to get the following speeds using the auto-detect feature: Clock speed - 950Mhz Memory speed - 1235Mhz Do you think there is much headroom left for overclocking? My specs are listed on the left-hand side. I have no cooling system other than the stock, and I have not attempted to overclock my processor. Any help would really appreciated! Edit: Currently my GPU is running at 40c at idle, if that helps.