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@Brun
I had a proper facepalm moment when I recently realised I'd been doing this wrong for years.
Always had fans controlled by CPU temp by default, completely stupid since I'm watercooled. Even the briefest spikes in CPU load would cause everything to go loud, which was totally unnecessary because they didn't have any effect on the water temp.
I've now got the radiator fans controlled by water temp and other case fans controlled by GPU temp. Have set the curves for the radiator fans to be 100% by 40c but haven't seen them beyond 50% and they're still barely audible at that speed. Was concerned that the water temp would stay high without much airflow but it drops reasonably quickly.