Have bought the coolers, because I did not want to endure the constant up and down, turn the Intel-standard cooler. The Intel cooler was at my Core2Quad Q9550 (TDP 95W) an idle speed of 1200 rpm and is under full load went up to 2,600 rpm, and the speed has changed audibly at the slightest change in load. The Dark Rock 2 runs at a room temperature of 21 degrees at 570 rpm and the cores are at about 37 degrees. When Intel Burn Test 2:53 of all four cores to consume 100%, the rotational speed is 870 rpm and the core temperature is at about 45 degrees. Here, the cooler is completely inaudible. The installation of the cooler took me about 80 minutes to complete as the Board needs to be strengthened in such a large coolers, as a back plate for screw must be mounted on the underside of the boards. The Anlietung was well understood and illustrated. However, it could be that the cooler does not fit into any housing due to its enormous mass. The best measure in advance!
Hab of BeQiet also PSU and case fans and from another company a Festplattenramen which supports the HDD in rubber swinging freely. Now is only audible noise of the fan of the graphics card. If one wants to set a very quiet computer I can recommend the components of BeQuiet consistently.
