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. Measurements are made on the dB (A) scale.

FrostyTech Sound Level Results
-	Manufacturer	Model	Noise Level	Scale
	Verax	P16	35.3 dB	Quiet
	Spire	SP420B8	40.2 dB
	Zalman	CNPS7000-Cu	41.7 dB
	Zalman	CNPS6500-AlCu	47.4/28.9 dB
	Intel	Socket 478	42.5 dB
	CoolJag	JVC661A	43.9 dB
	Evercool	NW9F715CA	47.3 dB
	Arkua	848X-6B	49.3 dB
	Taisol	CEP426151A	50.7 dB
	Arkua	838T-7G	51.7 dB
	JMC	401100	53.0 dB
	Dynatron	DC1207BMW	53.0 dB
	Spire	SP411C5	53.2 dB
	Dynatron	DC1207BMY	53.2 dB
	Dynatron	DC1207BMX	53.4 dB
	Thermal Integration (high)	TI-V7035TN	53.6 dB
	Zalman	CNPS5700D-Cu	53.8 dB
	Globalwin	VA476	54.2 dB
	Dynatron	DC1206BMV	55.1 dB
	AVC	117140	56.1 dB
	Taisol	CCP445172	57.5 dB
	Dynatron	DC1U-B02	62.2 dB
	Coolermaster	IHC-H71	64.4 dB
	Thermalright (high)	SLK-900U	67.2 dB	louder

The Spire SP420B8 is one of the quietest heatsinks we have tested in some time. To balance out the very low noise output, Spire have used a full copper heatsink. Had an aluminum heatsink been used the thermal results would not have been as good, as you're about to see.