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 come in at just over 63dB which sees the card sit in towards the top half of the bracket. It's not too bad; I would've liked to have seen idle be a little lower, but it's nothing too major. You could always manually adjust it if you wanted, or setup custom profiles.