One of the nicer things about the 70mm fans is that they need not rotate quite as fast to move as much air as the 60mm fans do. In the case of the fan mounted on the Model 5T, it is not perfectly quiet, but nor is it anywhere near to that of the insanely noisy Delta fans. If you click on the pair of headphones you can listen to this heatsink for yourself. Interestingly, the waveform image looks a bit out of scale compared to the noise the fan produces.

FrostyTech Acoustic Sampling Chamber (~10 sec)
Spectral view.
Standard Waveform view. (Listen to an MP3 recording of 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	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

The temperature results instantly paint the model 5T as an OEM cooler, at about the same level as the Volcano 6Cu+, but with less weight and noise. The cooler seems to work best on the small interface die, and although the numbers aren't amazing, they aren't cause for concern either.

The Thermalright CB-6L, a cooler we recently looked at comes in farther behind for most of the tests, especially on the 100W small interface die. Of course you are dealing with a 70mm cooler so size considerations are important. The sides of the heatsink are angled to help clear nearby capacitors which is nice to see.