We take our noise measurements with the sound meter positioned 1 foot from the graphics card. I measured the noise floor to be 32 dBA, thus anything above this level can be attributed to the graphics cards. The power supply is passive for the entire power output range we tested all graphics cards in, while all CPU and system fans were disabled. A reading under load comes from running the 3DMark Time Spy stress test for 30 minutes.
The principle difference between the P and Q BIOS is the fan curve, and that is demonstrated by our acoustic testing. Using the default P BIOS, the fans run at 75%, or about 1930rpm. This produced noise levels that were on par with the Founders Edition, and 1dBa quieter than the Gigabyte Eagle OC.
The Q BIOS drops fan speed to 64%, or 1470rpm, and that makes a noticeable difference. Noise levels dropped to 35dBA on our sound meter, just fractionally louder than the MSI RTX 3080 Gaming X Trio, though subjectively speaking I could not tell the difference between the two. It is highly impressive that ASUS has managed to achieve such low noise levels with the Q BIOS, despite the fact the GPU core remained under 70C at all times.