Dredj

Good news and bad news, it's not Corsair's equipment making the noise. It's actually the useless mini fan most x570 mobo's have on the southbridge. My mobo brand has a famously horrible noisy fan on it and I usually have it turned low but when I got my 3080 I turned it to 30% which is nearly inaudible, however, recently I've been hearing fluctuating frequencies and being pretty sure it's that fan I went into BIOS to lower it. Every time a change is made to that fan it revs up then lowers to whatever duty I set, and doing this is how I found out it's not the Corsair AIO pump as every time I made the change the grinding would kick in.

I think it's two years, at least that's when the return window closed on Amazon, July 2021. And it's the H150i PRO. https://www.corsair.com/uk/en/Categories/Products/Liquid-Cooling/Hydro-Series™-PRO-RGB-Liquid-CPU-Coolers/p/CW-9060031-WW

I've had my Corsair H150i for 25 months, I'm one month out of warranty and my pump has started grinding on system boot. It's been fine with zero issues for 24 months and now this grinding noise. So the grinding noise is sometimes present on a cold boot, sometimes it's there for a few seconds and sometimes it can hang around for 10 minutes like today before fading away. Two days ago I turned my PC on from cold and went to my kitchen and the pump started performing, it sounded like a chainsaw revving. My RTX 3080 fan doesn't spin and I turned all my case fans off so they were not spinning either, I can only think it's the Pump and sticking my ear into my case(750D) it sure sounds like the noise is coming from the pump and it was the only "moving part". Thoughts?