Why is my D5 so loud?

[Dominic-Toretto]

Hey everyone, just put my loop back together today. It has a Aqua Computer D5 Pump, The fan's are running at 200rpm and are silent, I cannot hear them at all. The pump however when running at 100% is very very audible, even turning it down to 30% I can still hear it clearly and it is by far the loudest thing in my PC, it is making what I would describe as a loud humming noise. The pump is attached to a heatkiller reservoir, which is mounted to the case on a decoupling stand with rubber feet. Pic below of setup:

 

[Dominic-Toretto]

Looks to be pretty overkill in terms of raddage. Is that 2x360’s and 3x560’s?
Most likely caused by your pump res combo. I’d drain your loop and detach it, rebuild it and test close to the sink until you’re happy with the noise levels.

Rads are 3 x 480's, 1 x 360 and 1 x 120.

Also what do you mean by caused by the pump / res combo? Are you saying that it is due to the products in my build. Not following what rebuilding it close to the sink would achieve?