To update on the IP35 Pro's awful high frequency whining, I was able to minimize the problem by changing my Vista power settings (high performance made the CPU run at 100% all the time).

So I've isolated the problem to occuring only under high loads. I have a feeling that a different motherboard (or even another IP35 Pro) may not have this issue, but I've seen a million similar complaints from people with laptops/desktops of various builds, etc. so I guess it's common.

What is more disturbing to me is the fact that my parents' IP35 Pro doesn't have the same EMI problems that mine does (audible via the onboard audio). So I guess I can either keep the board and buy a sound card and live with the buzzing under high CPU load... or go with a new board altogether (maybe a DFI Lan Party) and hope the problem was just my IP35 Pro.

Anyone else out there hearing this buzzing under load?