For our temperature testing, we measure the peak GPU core temperature under load. A reading under load comes from running the 3DMark Time Spy stress test for 30 minutes.
As for thermal performance, it immediately becomes obvious that using a cooler this large, even with one heatpipe missing compared to the RTX 3080 Gaming X Trio, is still more than enough to cool a 240W GA104 GPU. GPU temperature peaked at just 62C during my testing, which is a superb result and will surely take some beating from other AIB cards.