i assume that Option "Coolbits" "1" doesn't work with the latest driver and the gtx480 fermi card?
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Option Coolbits 1
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Coolbits 1 is not working indeed, but if you really are into changing the clock freqs, you should flash the bios.
Create DOS boot disk / USB disk with nvflash on it.
Extract the BIOS from your card.
Use nibitor 5.6 through Wine for changing the values.
Save the edited BIOS to your DOS disk.
Flash the new BIOS to your card.
I did it (except, I used GPU-Z in Windows for extracting the BIOS and ran nibitor in Windows because I don't like Wine) and I'm running my GTX 470 now @ 700/1700. Underclocking is possible too.
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