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).
I think one of the larger reasons for the heat levels on the Palit and Gainward cards is the fact that they've been quite aggressive when it comes to noise levels.
You can see that even in SLI, this is an extremely quiet setup. If you wanted your cards to run a bit cooler and you didn't mind the extra noise, you could always use something like MSI Afterburner and run the fans manually at a higher RPM.