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.
As for thermal performance, here I've tested both BIOS modes for all three cards, and honestly, the results are as expected. The MSI Suprim SOC does offer the lowest raw thermals, but I was hoping to see that given it's using the same cooler from the RTX 5090 Suprim SOC. The Gaming OC Performance BIOS is in third place, while its Silent BIOS – and both modes of the Gaming Pro OC – all hover around the 65C mark.