Pulling out the TES 1350A Sound Level Meter we find ourselves quickly yelling into the top of it to see how loud we can be.
After five minutes of that we get a bit more serious and place the device two CM away from the fan on the card to find the maximum noise level of the card when idle (2D mode) and in load (3D mode).
Noise levels see the Radeon HD 7990 sit towards the middle of the pack. We're just over a dB louder than the EVGA GTX TITAN SuperClocked.
Overall it's a pretty strong number considering the amount of performance that's on offer from this huge video card. AMD's claims in its press kit about the cooling fans was pretty accurate.