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.
Despite rocking a few internal changes, such as the lack of the 3D Vapour Chamber, the RTX 5080 Founders Edition cooler is still more than a match for this 360W GPU, and temperatures hit just below 65C over our thirty minute stress test. VRAM, meanwhile, was slightly warmer at 76C, but still nothing to worry about. It's be interesting to see what performance would be like if Nvidia had used the same exact cooler for the 5080 as with the 5090, but even with a few cut backs, this is more than good enough.