hi I have radeon powercolor hd4830 512 ddr3 and tryed to overclock it. It works fine but def.clocks are 575/900 2D clocs are 500/750 and after overclocking to 750/1000 its have these clock even in 2D ( in windows) how i can apply 500/750 2D and 750/1000 3D in rivatuner.
Use search please, it was discussed before numeropus times. That's by design of ATI drivers providing unlimited overclocking interfaces - PowerPlay is disabled when overclocking hardware via AMDGPUClockTool, ATITool, ATITrayTools or RivaTuner. PowerPlay can stay active only in case of Overdrive 5 overclocking (which are available in CCC and which have limited adjustable clock range). If you want to go further and overclock with the tools mentioned above, you may also use software emulation of PowerPlay (e.g. via 2D/3D detection in ATITool, via scheduler module in RT etc).
