We take our noise level measurements with the decibel meter on the top and middle section of the case, overhanging the side panel (power supply side, not motherboard tray side) by exactly 1 inch to avoid any airflow pressure coming from the exhausting AIO cooler.
I measured the sound floor to be 34 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.
Noise levels were measured after 5 minutes under three scenarios: desktop idle, Deus Ex: Mankind Divided at 4K, and the Fire Strike Ultra stress test.
Not only is the Gaming X Trio very cool-running, it is also very quiet. At idle it emits no noise thanks to Zero Frozr technology, while it peaked at just under 43 dBa. In the real world, this means the Gaming X Trio is far from loud and would be drowned out by even the quietest of music.