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 A Plague Tale: Requiem for 30 minutes.
What makes the thermal performance even more impressive is that the Challenger ran so quietly under load. In my testing the fans did not spin up beyond 1080rpm, so the noise didn't even register on my sound meter – it is that quiet, and clearly indicates the cooler is way overkill for this level of power. Not that I'm complaining!
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