For the size of the fan which is used on the Vantec CCK-7025 it produces a fairly conservative level of noise. Perhaps this is due to the fact that there are just seven blades on the impeller, or perhaps it is because the fan rotates at moderate 4000RPM. To listen to this heatsink for yourself, click on the little headphones below and download the MP3 file.

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
	Vantec	CCK-7025	51.4 dB
	ChoLiang	CB0307Z17	52.9 dB
	Dynatron	DC1207BMW	53.0 dB
	Globalwin	VA476	54.2 dB
	Dynatron	DC1206BMV	55.1 dB
	Glacialtech	Igloo 3300	55.4 dB
	ChoLiang	CB0309Z17	55.7 dB
	AVC	117140	56.1 dB
	NengTyi	NW6700	58.0 dB
	Coolermaster	IHC-H71	64.4 dB	louder

The stock Intel heatsink is among the quietest of the Pentium 4 fans which a good testament to the level of engineering which has gone into it. We measured the Vantec CCK-7025 with our sound meter under real world conditions and it produced about 51.4 dB of noise. This is above the stock intel acoustic results, but pretty good as Pentium 4 heatsinks go.