Ive got an nvidia 780 in my system, and I noticed that when I was playing Dirty Bomb that a lot of heat was coming out of my computer - I ran GPU-Z and found that during gameplay, the graphics card temperature was running at about 72°C, with spikes up to 80°C! The GPU load was almost constantly 100%.
I found out that switching the game from fullscreen to borderless windowed lessened my GPU load to about 40%, and the card never reached above 54°C. If you’re having the same issue, try this! (And devs, do you think you can address this issue?)