OCC published GPU Thermal Testing Scripts Experiment
A quote from the article:
The most important characteristic of these scripts is that they work with the different versions of Fire Strike, Time Spy, Port Royale, and can even run with the ray tracing turned off on Port Royale. Adding support for more tests should not be too difficult, as the formatting for the definition files is quite modular, but I have not felt it necessary to add more at this time. For this article, I tested just with Fire Strike Extreme and Time Spy, which both run at 2560x1440. Exactly like the CPU Thermal scripts, there is a five minute warm-up period at the start, then the test period for one hour, and then the cooldown period for the one hour length of the test period.GPU Thermal Testing Scripts Experiment