Unlike the Arkua 7228, the 7528 is relatively quiet. A 70mm fan rotating at a lower RPM is the main reason for this. To listen to this heatsink, click on the pair of headphones below.

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	Arkua	7228	23.1	37.3	39.4		52.0	57.2	none	1	loud	easy
2	Thermal Integration	TI-V77L	26.5	39.1	44.4		57.5	63.6	grey	1	med	med
3	Coolermaster	HCC-002	22.0	41.0	45.8		54.6	66.3	none	1	loud	easy
4	Arkua	7528	22.4	43.6	46.7		62.4	72.7	none	1	med	easy
5	Vantec	CCK-6027D	27.4	45.4	49.6		64.9	73.4	none	1	med	med
6	OCZ	Dominator	26.5	37.7	50.9		52.4	74.2	none	1	loud	med
7	Akasa	Silver Mountain	26.6	46.2	51.5		65.0	76.1	none	1	loud	med
8	Vantec	CCK-6035D-Retail	26.5	44.2	52.8		63.2	77.9	none	1	loud	med
9	Thermaltake	Volcano 6cu+	26.5	40.3	55.3		58.6	84.4	carbon	1	loud	med
10	Spire	5T060B1H3R	26.7	42.7	57.5		64.6	85.1	none	1	low	med
				50W	50W		100W	100W

The difference in fans between the two Arkua coolers equates to not only a saving in acoustic output, but a decrease in thermal performance as well. The lower power 70mm fan just doesn't produce the same volume of air to keep up with the noisy 60mm fan and the Arkua 7528 drops down into the fourth position with our list of reference heatsinks.