High temperatures at power-on are common issues.
High temperatures at power-on are common issues.
Components: Ryzen 7800X3D Arctic Liquid Freezer II 360 B650I aorus ultra Corsair RM850e I’ve been using this setup for a few months and wasn’t sure if there was a problem. When the PC starts, the CPU temps jump quickly to about 80°C and then rise gradually before suddenly falling back to normal idle levels (refer to attached data). Just before they drop, you notice a brief sound like running water followed by a temperature decrease. I’m pretty sure this isn’t due to a cooling fan or thermal paste issue—this seems unusual. Seeing similar issues during initial build with overheating suggests it might be another factor. A related discussion might help.
Your temperatures decrease immediately upon detecting water movement, suggesting the pump is activating. This likely stems from the motherboard's settings for handling the header. Could you verify the header configuration in the BIOS or check any installed software that might alter its behavior? Also, please share your current BIOS temperature readings.
The sole wire manages both fans and the pump—this is the standard design, and the pump is (per Arctic) also PWM-adjustable, allowing speed changes while running.
This would be a very bad design because it’s completely fine to halt fans when they’re not needed, but the pump should always stay on or run at around half speed. If that happens, I’d configure the BIOS fan settings high until the operating system starts, then use a tool like FanControl with a carefully adjusted curve so it never drops too low.