Only the new radiator fan starts when the system boots.
Only the new radiator fan starts when the system boots.
It sounds like something is slightly hitting/rubbing against a fan. If you used any zip ties, make sure the excess isn’t getting into the fan blades.
You don’t have fans on top, only front radiator fans. The unusual noise is coming from the top. The mini ITX motherboard has a front fan, and the rear I/O is on the back of the case. It’s hard to tell if it’s from an AIO pump, but is this sound typical?
Does the position of your pump affect anything? And what about the orientation of the radiator tube? Yeah, just focus on that.