I think the vdroop mod will also be worth your time. I just did it to my board. Previously, vcore was set at 1.41 in bios, actual idle was 1.37 (which I could live with). But then under load, vdroop was .04 making it 1.33 load. After the mod, I'm setting 1.41 in bios, getting 1.41 actual idle and 1.41 load. (Thank you Jonny Bravo!)

Also, I have a question regarding pwm temp. uguru is reporting pwm @ 90C+ under full load! I know it may be slightly inaccurate because its reporting cpu at 71C while coretemp is reporting 55C, but how hot is too hot? I don't think I'd be able to sleep at night knowing its at 90C. I have voltages at:
vcore: 1.45 (decided to push the cpu further since vcore is rock solid)
mch 1.25v: 1.41
cpu vtt: 1.31
ich 1.05: 1.05
ddr2: 2.200
ichio 1.5v: 1.50