I'm not sure if the 80mm Delta fans are better than the 60mm Delta fans or just about even acoustically. It's true that the small 60mm fans have a significantly higher pitch to their wail, but the 80mm ones aren't exactly silent either. When given the option between the two noise signatures I would have to side with the latter. At least with the larger 80mm fans you should be able to get away with the noise by simply sticking the case far under a desk. The spikes in the image below are where static got into the recording thanks to a loose connection somewhere. Most of the noise generated by this fan on the MCX462 is simply air moving through the many pins.

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	Swiftech	MCX462	24.0	38.7	42.8		52.6	60.8	none	1	med	med
2	Arkua	6258	22.6	38.4	41.8		55.0	61.9	blue	1	loud	med
3	Thermal Integration	TI-V77L	26.5	39.1	44.4		57.5	63.6	grey	1	med	med
4	Coolermaster	HCC-002	22.0	41.0	45.8		54.6	66.3	none	1	loud	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	Arkua	6158	22.5	43.5	51.0		67.5	78.6	blue	1	low	easy
10	Thermaltake	Volcano 6cu+	26.5	40.3	55.3		58.6	84.4	carbon	1	loud	med
11	Spire	5T060B1H3R	26.7	42.7	57.5		64.6	85.1	none	1	low	med
				50W	50W		100W	100W

The Swiftech MCX462 comes in at first place, but the Arkua cooler is close at hand. Given the larger mass of the MCX462 is this is not altogether unsurprising to see. It also happens to use a much larger fan than the Arkua cooler, but one that is also a bit quieter I reckon. Let's move ahead to see what the final results are.