"The first batch liquid coolers could manage fan speed in BIOS under DC mode. but our cooling team do some changes, and the pump speed could not be changed anymore, and pump is designed to keep running at full speed. so you could find the difference as you mentioned. if you could manage pump speed, as long as the temp is good, you could lower its speed in BIOS, it will not affect lifespan."
An official response to DC concerning newer LS720 coolers. Incredible change/improvement. When even at full pump speed my CPU reaches 80C on an all core load, but at least its rivals nvidia gpus in annoying noise output. Somehow its even louder than my 3080s coil whine lmfao.
First and last time I ever bought something from them. All the reviews I read mentioned changing pump speed. Guess I'm fucked.