The Taisol CEP426151A uses a Delta fan that draws 0.33A so it does rotate with a bit of force. Noise levels are low, but there is a slight whine to the fan which could be amplified by the case in some circumstances. To hear this heatsink for yourself, click on the little headphones below and download the MP3 file of the cooler in operation.

FrostyTech Acoustic Sampling Chamber
Standard Waveform view of a 10 second recording. Click on the headphones to listen to an MP3 recording of this heatsink in operation.

Sound Level Measurements:

Listening to the actual noise a heatsink makes allows you to hear what pure numbers alone cannot get across. To further emphasize FrostyTech's reliance on cold hard facts when evaluating a heatsink, we also take Decibel readings with a sound level meter. These results may be higher than the manufacturer's listed specs, but then again these are real world measurements.

FrostyTech Sound Level Results
-	Manufacturer	Model	Noise Level	Scale
	Zalman	CNPS6500-AlCu	47.4/28.9 dB	quiet
	Intel	Socket 478	42.5 dB
	Cho-Liang	CL-CB0094-1A	49.8 dB
	Cho-Liang	CL-CB00881	50.2 dB
	Taisol	CEP426151A	50.7 dB
	Dynatron	DC1207BMW	53.0 dB
	Swiftech	MCX4000	53.6 dB
	Dynatron	DC1206BMV	55.1 dB
	AVC	117140	56.1 dB
	NengTyi	NW6700	58.0 dB
	Coolermaster	IHC-H71	64.4 dB	louder

It is getting really hard to most manufacturers to out-perform or even match the noise levels that the stock Intel heatsink are capable of. The stock Intel heatsink is pretty damn quiet. The Taisol CEP426151A does manage the task with pretty reasonable levels of noise - just shy of the 50 dB mark, which isn't half bad at all.