In the olden days before 7000RPM fans, heatsinks were generally quiet little devices. This is one such cooler.

Based upon a traditional 19CFM 60mm fan, the CB-6L is very quiet while in operation. Rather than use longer lasting (and noisy) ball bearings, the Sunon fan uses a vapour bearing system which, evidently from the waveform, is superbly quiet. In the end, the lower rotational speed, and smaller size of the fan conspire to produce a refreshingly quiet heatsink. As always, you can listen to this heatsink by clicking on the headphones to the right of the waveform images. The 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	Akasa	Silver Mountain	26.6	46.2	51.5		65.0	76.1	none	1	loud	med
5	Vantec	CCK-6035D-Retail	26.5	44.2	52.8		63.2	77.9	none	1	loud	med
6	Thermaltake	Volcano 6cu+	26.5	40.3	55.3		58.6	84.4	carbon	1	loud	med
7	Spire	5T060B1H3R	26.7	42.7	57.5		64.6	85.1	none	1	low	med
8	Thermalright	CB-6L	24.6	50.3	57.7		73.8	92.7	white pad	1	low	med
9	Fortis	A92	26.7	45.6	65.8		67.8	97.8	none	1	loud	stiff
				50W	50W		100W	100W

Well the performance of the CB-6L is no where near what you might have expected from the Thermalright SK-6, but it is not at the bottom of the list either. One thing is very clear, and that is the poor performance of this cooler on the large interface die. When mounted on the small interface die the performance of the CB-6L is only slightly above that of the Fortis A92, at 50W and 100W.

Overall, it would seem as though Thermalright had regressed in heatsink design instead of progressing. In any case the rise above ambient temperatures are up next.