I planned on getting back to this thread much sooner but was sidetracked by another build. Anyway I think I got lucky with my Rev 3 mb, no real heat issues with the vrms, just the SB. I installed a low profile sink/fan on the sb and it has kept temps under 55C. I also got lucky with the 8350, it has great P-state voltages.
# of P-States 7
P-State FID 0x1A - VID 0x0A - IDD 13 (21.00x - 1.425 V)
P-State FID 0x19 - VID 0x0D - IDD 13 (20.50x - 1.387 V)
P-State FID 0x18 - VID 0x13 - IDD 12 (20.00x - 1.313 V)
P-State FID 0x12 - VID 0x1B - IDD 10 (17.00x - 1.212 V)
P-State FID 0xC - VID 0x23 - IDD 8 (14.00x - 1.112 V)
P-State FID 0x5 - VID 0x2C - IDD 5 (10.50x - 1.000 V)
P-State FID 0x10C - VID 0x36 - IDD 4 (7.00x - 0.875 V)
The 20x p-state is one of the lowest I have seen.
This is my 24/7 clock with a 240L modified and lots of air. No heat issues with a extra 200mm side fan on a pair of 7970's.
Been thinking of upgrading this MB, UD5 UD7, or maybe the new revision 4.