The Papst fans are built solidly, but still manage to produce a sizeable degree of noise. 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 this particular impeller you can see four small drill holes which were used to remove material and true up the rotational stability of the unit.

As always, you can listen to this heatsink by clicking on the headphones to the right of the waveform images. The acoustic sample is about 10 seconds in length and is stored in MP3 format.

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	Vantec	CCK-6027D	27.4	45.4	49.6		64.9	73.4	none	1	med	med
3	OCZ	Dominator	26.5	37.7	50.9		52.4	74.2	none	1	loud	med
4	Swiftech	MCX370-0A	22.3	42.0	46.1		60.3	75.6	none	1	med	hard
5	Akasa	Silver Mountain	26.6	46.2	51.5		65.0	76.1	none	1	loud	med
6	Vantec	CCK-6035D-Retail	26.5	44.2	52.8		63.2	77.9	none	1	loud	med
7	Thermaltake	Volcano 6cu+	26.5	40.3	55.3		58.6	84.4	carbon	1	loud	med
8	Spire	5T060B1H3R	26.7	42.7	57.5		64.6	85.1	none	1	low	med
9	Thermalright	CB-6L	24.6	50.3	57.7		73.8	92.7	white pad	1	low	med
10	Fortis	A92	26.7	45.6	65.8		67.8	97.8	none	1	loud	stiff
				50W	50W		100W	100W

This isn't a copper heatsink and that shows up immediately. The MCX370-0A sits in at about the fourth position in this list of reference coolers. At least it does for the moment, when we factor in the ambient temperatures and show the results in terms of the rise above ambient results things can often look quite different.