ID-Cooling FX240 PRO White 240mm Liquid CPU Cooler

Works and cools a Ryzen 9 3900 I'm using for a server and does so pretty quietly under load once you dial in the fan curves. The fans do need to run fairly slow to be quiet.
That said you can hear bubbles in the loop, and when the pump starts up it makes a bit of a noise, certainly a lot louder than a DDC or D5 pump, but considering you can get the whole loop for less than the price of a single DDC, it's not bad.
The only concerning thing really is the sound of bubbles in a new loop. It means it was probably not filled properly from the factory and it'll probably not last too long.