powerful and beautiful, a bit pricey though
The most powerful pump that ek has released, it helps incredibly especially when you have multiple blocks rads and have quick disconnects in the same loop.
I have 4 coolers, 2 graphics cards, and the processor in one loop and the return to the reservoir at full speed is like having the hose in the garden completely open. Silent (with the bracket and a little DIY with rubber washers, it doesn't transfer any vibrations at all)
In normal gaming use at around 40% (1900rpm), you can't even hear that it's working. (800rpm minimum to 4800rpm total is unnecessary but why not)
So from 800rpm to 3000rpm, it is completely silent (tested with all fans off)
You can hear more from an HDD that I have than the pump at 3000rpm. The HDD is a 2.5" 5000rpm supposed to be one of the quietest