For our temperature testing, we measure the peak GPU core temperature under load. A reading under load comes from running Cyberpunk 2077 for 30 minutes.
As for thermal performance, the dinky reference card is more than a match for the Navi 33 silicon. The GPU peaked at 71C, with the hot spot a touch warmer at 91C, but still within safe limits. We will shortly be testing the Sapphire Pulse model to see how it compares.