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 Metro Exodus Enhanced Edition for 30 minutes.
Noise levels is an area where the Suprim Liquid X does well. Using the Gaming BIOS, we saw noise levels hit 37dBa, and this dropped 2dBa using the Silent BIOS as that has a more relaxed fan curve, for both the radiator fans and the fan on the card itself, so this is definitely a key benefit to the AIO approach.
That said, I did notice a bit of coil whine when gaming, it was nothing terrible but we include a sound test in the video. The whine was also exacerbated with the card overclocked, so just something to keep in mind.