if you are clocking/changing fan speeds on your 48xx cards then
this is a very handy little tool, unfortunately you wont be able to push over 700 on your gpu without pencil/hard modding the card since the voltage is locked in the bios, do not go using it unless you know what to do and unless you know what you are talking about when it comes to graphics cards, the loss of your card is your responsibility.
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The 5th Soliloquy
Q6600 2.4ghz @ 3.3ghz | Asus P5Q Deuluxe | Sapphire HD 4850 650/1025
G.Skill 2GB DDR2 PK PC2-8500C5 | Antec 900 | WDC 250gb