Permanently overclocked my Sapphire ATI Radeon HD4670! How? Ripped the video BIOS using GPU-Z. Downloaded a factory OCed BIOS for a Sapphire HD4670 (Core Clock 775 MHz, RAM Clock 1000 MHz) from techPowerUp. Opened both BIOSes using RBE (Radeon BIOS Editor) and copied over the original BIOS identifier to the downloaded one. Adjusted fan speed setting in the new BIOS to linearly scale with the temperature. 0 C : 0% speed - 100 C : 100% speed. Save the new BIOS and flashed it using ATIFlash. Restarted system. Result: Old GPU Core Clock = 750 MHz, New GPU Core Clock = 775 MHz. No overclocking software required. Damn thing overclocked in hardware! Did not stop there though. Enabled AMD OverDrive in CCC and set the damn thing to auto-tune. Turns out the card is stable at CC of 790 MHz and RC of 1130 MHz. Finally called it a day!