yeah motherboard detects wrong between PWM and DC all the time. I'm convinced the detection doesn't even work at all and it just ends up on whatever default the motherboard has preset.
it's odd that the motherboard would have a shutdown if not detected for 1min though usually it just keeps going at 100% and ignores it. and since your speed control is working it's not likely to be the problem.
it is theoretically possible for a header to be underspeced and not be able to fully juice what is connected but you hit that wall with pumps rather than fans usually... splitters and stuff are very commonly used with fans. so I wouldn't expect it to be that.
what's the motherboard? and can you give a table breakdown of each fan header on the motherboard and what's connected on each.
- aio pump
-rad fans x2
-speed control for controller (what controller? is it aftermarket or built into the case)
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