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i wanted to know if there exist a software that can do that?
my card is nvidia 7600GT

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up vote 4 down vote accepted

You might try NVIDIA nTune :

NVIDIA® nTune is the ultimate utility for accessing, monitoring, and adjusting your system components, including temperature and voltages with clear, user-friendly control panels. Overclock your system for highest performance or underclock it for near silent operation. All changes are performed within the Microsoft® Windows® interface – enabling full functionality without the need to make changes in the BIOS and reboot your system.

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it works fine but the problem is that after the reboot the frequencies arent saved. is there is a way to save the frequency between reboots? – Karim Oct 2 '10 at 17:20
Don't use that version of nTune. That is the nTune tool from 2007. Even google points to the old one. nVidia has a more recent release of nTune, packaged as "nVidia System Tools", at: , from April 2010. – Cheeso Nov 30 '10 at 18:25

You can use RivaTuner to overclock or underclock.

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