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.
Thermal performance is solid from the Gaming OC. With the OC BIOS, we saw a peak temperature of 68C and a steady state of 66C. Switching to the Silent BIOS adds 2C to both results, simply due to the fact the fans spin slower. Both BIOS run cooler than the Nvidia Founders Edition, but the Gaming X Trio is the coolest-running RTX 3070 we've tested so far.