The Papst fans are built solidly, and in this particular heat is fairly quiet all things considered. One of the nicer points is that Papst do try their very best to diminish vibrations by balancing the impeller assembly. If you look at the side of the impeller you should see several small drill marks which are used to remove material and true up the rotational stability of the impeller. It also helps to have small rubber washers separating the fan from the assembly, and further absorbing vibrations.

As always, you can listen to this heatsink by clicking on the headphones.

Synthetic Temperature Test Results: *Ranked according to 100W small interface die test results.

FrostyTech Synthetic Temperature Test Platform Results
	Mfg.	Model	Ambient Temp.	27mm large copper block	15mm small copper block		27mm large copper block	15mm small copper block	Thermal pad	No. Fans	Fan Noise	Clip force
				50W	50W		100W	100W
1	Thermal Integration	TI-V77L	26.5	39.1	44.4		57.5	63.6	grey	1	med	med
2	Swiftech	MCXC370	21.4	38.3	43.4		53.5	65.7	none	1	med	med
3	Vantec	CCK-6027D	27.4	45.4	49.6		64.9	73.4	none	1	med	med
4	OCZ	Dominator	26.5	37.7	50.9		52.4	74.2	none	1	loud	med
5	Swiftech	MCX370	22.3	42.0	46.1		60.3	75.6	none	1	med	hard
6	Akasa	Silver Mountain	26.6	46.2	51.5		65.0	76.1	none	1	loud	med
7	Vantec	CCK-6035D-Retail	26.5	44.2	52.8		63.2	77.9	none	1	loud	med
8	Thermaltake	Volcano 6cu+	26.5	40.3	55.3		58.6	84.4	carbon	1	loud	med
9	Spire	5T060B1H3R	26.7	42.7	57.5		64.6	85.1	none	1	low	med
10	Thermalright	CB-6L	24.6	50.3	57.7		73.8	92.7	white pad	1	low	med
11	Fortis	A92	26.7	45.6	65.8		67.8	97.8	none	1	loud	stiff
				50W	50W		100W	100W

The copper base on the MCXC370 sure makes a big impact over the performance of the MCX370-0A and this set of reference coolers. The gist of this increase in cooling prowess is that copper conducts heat much better than aluminum, and well you know the rest...