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 Cyberpunk 2077 for 30 minutes.
The good news is that both BIOS modes run quieter than Nvidia's Founders Edition. The Gaming BIOS saw the fans run at 1640rpm, and that produced 38dBa on my sound meter. The Silent BIOS, meanwhile, runs the fans at just 1100rpm, producing a whisper-quiet 33dBa – only just above the noise floor of my testing environment, so it is very quiet indeed.