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 actually manage to come in slightly lower at load here. Of course we always have to throw a dB in here and there for fluctuation to the environment.
Overall the overclock doesn't seem to affect the temperature or the noise of the video card much at all.