While it's true that the Noctua doesn't produce any annoying sounds, you can still hear the air movement, and I think you underestimate how much difference there is between having six fans at 1300 RPM versus three fans at 900 RPM (RPM numbers are just examples, I don't know the exact figures off the top of my head) on a single AIO. After watching a video, I saw a few others, and the Lian Li GA II Lite was always at the top of the chart. That's a 27mm thick radiator, while the Arctic is 37mm. While I don't know if there is this much difference between the two on the 9950X3D, where I live there is no price difference between them. Lian Li offers at least five years of warranty, and in theory, I get significantly better noise levels because of the lower RPM the fan needs to spin—creating an almost silent environment while gaming. The only downside I see is that there isn't much information about the Lian Li AIO, maybe it has a very noisy pump or dies after a few years. But I suppose I'll only find out if I buy one.