Hi, i was looking for something to overclock gpu intel gma 500. I have noticed that you are using rweverthing to change freq with your setigp and gmaboost. From gma500 datasheet graphic clock controll is a little bit different from others intel gpu. GCFC is located in: Address F0h-F3h Default 00000002h Size 32bit Bit 31:2 are reserved 3:2 10b 01=ratio is 2:1 1:0 10b -> 01=ratio is 2:1 for 200mhz at fsb 100mhz 266mhz at 133mhz 10=ratio is 3:2 for 200mhz at 133mhz Opening intel vga device with rweverithing F0=06 F1=00 F2=FF F3=01 (gma500 at 200mhz). What do you think? On my device fsb is 133mhz but with standard setting 3:2 gma is set to 200. I need to change to ratio 2:1 Maybe you can get more infos on gma500booster.blogspot