i9-10900K + Corsair H150 RGB 360mm AIO — 100°C under load, thermal throttling active, can't find a solution.

System CPU: Intel Core i9-10900K — 10 Cores, LGA1200 Motherboard: MSI MPG Z490 Carbon EK X AIO: Corsair H150 RGB — 360mm RAM: HyperX Fury RGB 32GB (2×16GB) DDR4 3000MHz GPU: ASUS GTX 1060 Dual OC 3GB PSU: Corsair HX1000 — 1000W 80+ Platinum Storage: Samsung 970 EVO Plus 500GB + Seagate Barracuda 2TBCase: MSI MPG Sekira 500G Mid Tower

Problem Under load, all cores reach 95–100°C with thermal throttling active. Radiator fans are running at full speed but temperatures don't drop. At low power draw (15–25W), temps stay around 45–50°C. As power demand increases, temperatures rise disproportionately — hitting 100°C even at 60–70W. Calculated thermal resistance is ~2.68°C/W, whereas the expected value for a 360mm AIO is around 0.30–0.40°C/W.

What I 've tried Two technicians looked at it, neither reached a concrete conclusion. I started digging into it myself after that. I noticed the pump header was set to DC mode in BIOS — switching it to PWM dropped the CPU from...​

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