so it seems stable at those settings - it was good for an hour of prime95, now im running the f@h single-core client, so with ht on thats only 50% cpu load, so i wont be stressing the mobo so much. i think my questions were answered, but if anyone has any other advice/suggestions, that might sway my decision for best answerer (not sure right now)
When you pushed the FSB, did you drop the memory multiplier? If not the memory may be well over spec.
A high pitched noise from the voltage system is generally normal as there are coils that can vibrate(some worse then others). Many board(K8V SE,770T USB3 and even X58A-UD5) and even video cards(X1900XT,8800GTX) do this on stock settings. I would still keep an eye on it as you are pushing it harder.
A single thread of f@h does not significantly lower stress on the system as the second core is fake so to speak. While windows sees an extra core it is fact just a small part of the chip that allows this to happen, major work is still done by the one core in the cpu. I am not saying there are not advantages to HT.