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.
As for out of the box noise levels, we have tested a trio of very quiet graphics cards! The Nitro+ is basically inaudible, hitting just 25%/1215rpm fan speed during my testing. It did register on my sound meter, but it would easily be drowned out by a case fan.