For our temperature testing, we measure steady-state GPU temperatures under load. A reading under load comes from running A Plague Tale: Requiem for 30 minutes.
Thermals are no problem for the Suprim, either. Starting out with the Silent BIOS, the GPU ran 2C hotter than the Founders Edition, but the VRAM actually saw a 10C reduction in temperature, which is very good going. You'll get even better thermals from the Gaming BIOS, though, given it runs with a more aggressive fan speed, and that resulted in a GPU temperature of just under 63C, while the VRAM topped out at 68C.