OK, up and running with no problems so far, just got Vista SP1 installed, getting drivers on there now. I'll let you know how it goes. What is a normal idle temp btw? In the BIOS my CPU temp hovers around 35C, though from what I remember BIOS temps tend to be higher than idle.
Edit: OK! Got it stable easily at "auto" for all voltage settings beside the DRAM bus (which I set to 1.55v). Should I leave Speedstep enabled by the way? It doesn't seem to do anything other than lower idle temperatures so I'm inclined to leave it on. Will it disrupt gaming stability? So far I'm using OCCT 3.1 and its been stable with good temps for about 10 minutes now.
Strangely enough, my CPU core temps are showing as slightly lower than with stock clocks.