Been a bit bored as of late and wanted to see how low temps I could get. Microsoft in their infinite wisdom gave the CPU farrrr too much voltage: 1.7V! Nuts!
Well the CPU itself runs perfectly fine at 1.3V (lowest the voltage reg will go without messing with the feedback loop).
1.0: Remove the 0ohm resistor on R2E4
1.6: Remove the 2 0ohm resistors on R2E7 & R2E3
The only drawback of doing this, is you'll no longer be able to push the CPU frequency over ~950MHz.
The temperature screenshot is from my 1.6, I'm aware that the 1.6 does not have entirely accurate monitoring, but you can see a clear difference. Both were taken at a ~73F ambient with fan running at 20%.
Enjoy.