[Fastmix]

Excellent information for 4870 owners, you deserve an applause for the time an effort.
I am to lazy to create shortcuts, click them before a game unclick them after so what I have done is used the bios that lets you switch voltage 113_B50701_105 and set all the low settings to 550/900/1.063 and left the high @ 750/900/1.263, notice that the memory does not change, no flickering then I have used the fan profile from the Asus top bios and that is it.
Not the most power efficient card on the planet but much better than stock, I have no way of measuring things but what I do know is that in Everest the GPU VRM module with the stock bios was reading 28.45 and my temperature was 54/55 idle, now GPU VRM reads 23.03 and my temp is 49/50, not a bad improvement and best of all extremely silent.

I am attaching a copy of the modded bios if you need it suit yourself, it works great for me.