As far as I know the BIOS cannot be modified to give more than 1.1v. I tried to change the BIOS to 1.15v, and it defaulted to 1.05v.

None of the methods explained thus far in this thread will allow more voltage through the BIOS. The highest VID is 03, and the card doesn't recognize anything higher. If there is a way to get more voltage through the BIOS it hasn't been discovered yet.

The stock cooler is adequate for the 1.1v BIOS mod. Just turn the fan up a little. I can barely hear it at 67% compared to the rest of my system, but I usually turn it up a bit more (75-85%) if I'm playing Crysis.

I'm going to get the HR03GT when it's released, and then I'll be trying the voltage mod using a variable resistor. I'm looking forward to those 850/2000/950 clocks!