I'm surprised it didn't throttle at 73°C.
you can't do anything about vdrop (the difference between bios and Windows idle) but you may be able to reduce vdroop (the difference between Window idle and Windows load)
What is your vdroop on its own not combined with vdrop as above?
Raising the FSB will not increase your temps greatly (if at all) voltage is the culprit there.
Reducing vdroop will allow you to set higher voltages more safely, e.g. before I pencil modded my board I had to set in excess of 1.4v in the bios to run 4.0GHz, this dropped and drooped down to around 1.35v under load but as soon as load was reduced to idle then the vcore would jump to over 1.4v, too much for me. So in effect you would actually reduce temps by reducing vdroop.
Your sensors are good to go, hot damn you sure got a top chip there.
Originally Posted by worshipme
I don't think you can push it much further without better temps.
This I agree with, by breaking 73°C you've reached the limits of your cooling, remember the thermal spec for your cpu is 72.4°C I wouldn't try any higher without better cooling.