We heard it
R600 is not louder than the X1950XTX. We can confirm this first hand as we heard it more than once.
It is not loud at least not louder than the Radeon X1950XTX. The big cooler doesn't rotate that fast and keeps the card cool at 800 MHz.
This is a hell of a task but the big cooper part is doing its job. Benchmarking R600 completely doesn’t make any sense as the driver is super immature and a lot of applications are crushing all the time.
The good news is that the super late R600 is not loud.