Originally Posted by Muppet
Can you try something for me and see if it helps. I was able to get mine to idle at 51Mhz by dropping the Hz on my 120Hz LCD to 110. Maybe if you set it to 59Hz it may do the same.
I don't have the option for 59hz in my control panel for my main monitor (Dell 3007WFP-HC) but I do for my secondary display, which is currently set to 59hz. The moment I disable my secondary monitor the GPU starts to idle down to 51mhz. I did also notice that when dual monitors are enabled and the displays go to sleep, the card does idle at 51mhz.
It's not that big of a deal really since I don't leave this machine on 24/7 and the fact that the card idles properly when the displays are asleep is enough for me.