Welcome to their outdated DX9 implementation.

It's not just the GPU that is getting hammered... your RAM and CPU are also. Nearly everything in the case is getting throttled in ways it likely isn't with the other games because they are better optimized. This can cause ambient case temps to warm up, and everything can suffer from it--not just the GPU. If you have fan speed control for your card, you may be able to tweak it a bit to help tone it down some...otherwise, you could try to increase air flow through the case to help keep the ambient temps down.