The AIO pump can be loud from the very beginning and also can get loud after some time so please check the following lines that might help you with your loud pump.
Problems with pumps can be a result of:
- Suboptimal orientation of the pump or radiator
- Faults on the pump
- Bubbles trapped in the pump
How to prevent/fix:
- Ensure that the pump and radiator are correctly installed, and review the manufacturer's guidelines or product manual for the correct orientation/installation.
- If the radiator/block is installed correctly, you can try tilting the case with the pump working at 100%
If this cannot fix the issue, please contact EK support for the AIO replacement.