Running at full speed the JMC 400094 is not really as noisy as the waveform image here seems to indicate. Never the less, in usual FrostyTech tradition we offer you the option to actually listen to this heatsink first hand. Click on the little headphones below and download the MP3 file to hear this heatsink for yourself.

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
	JMC	400094	50.8 dB
	Vantec	CCK-7025	51.4 dB
	ChoLiang	CB0307Z17	52.9 dB
	Dynatron	DC1207BMW	53.0 dB
	Zalman	CNPS5700D-Cu	53.8 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

At 50.8 dB the JMC 400094 SkyJet 60 is not too bad when it comes to noise levels. We noticed a little bit of vibration from the fans motor which may cause some reverberation in the chassis, but other than that it will probably get drowned out by the noise of the power supply.