Okay I have this Asus 5870 and I want to overclock it a little using CCC however when I do OC it when it's idle the clocks only drop to 400Mhz GPU and 1250Mhz memory. Is there any way to make the card just drop to 157Mhz and 400Mhz like the default? I want to overclock but not if it runs at 3D speeds during idle. Thanks