Noise levels are really not much of an issue with 1U coolers as SCSI drives, case fans and whatnot produce a lot more noise. Still, if you would like to listen to this heatsink click on the headphones and sit back and relax...

Synthetic Temperature Test Results: *Ranked according to 100W small interface die test results.

1U - 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	6149	23.2	50.9	53.1		81.2	81.4	silver	1	low	med
2	Dynatron	DC1206BMR	23.8	51.0	56.5		80.6	86.8	silver	1	med	stiff
3	Spire	5R057B1M3R	23.0	44.9	69.7		66.4	89.7	silver	1	med	easy
4	Vantec	FCE-6010	25.6	70.7	72.4		111.3	116.9	silver	1	low	stiff
				50W	50W		100W	100W

The initial results see the Model 5R from Spire sitting relatively low in our list of reference coolers, but within in spec for good performance. Obviously, the Vantec cooler sees some rather undesirable temperature results on the 100W test.

1U - Rise Above Ambient Temp. (c)
	Mfg.	Model	27mm large copper block	15mm small copper block		27mm large copper block	15mm small copper block
			50W	50W		100W	100W
1	Arkua	6149	27.7	30.0		78.0	58.2
2	Dynatron	DC1206BMR	27.2	52.7		56.8	63.0
3	Spire	5R057B1M3R	21.9	46.7		43.4	66.7
4	Vantec	FCE-6010	45.1	46.8		85.7	91.3
			50W	50W		100W	100W

The Model 5R from Spire is the best solution for larger heatspreader topped processors in this small list of reference coolers. Of the four 1U heatsinks we are using for comparison it displayed the best thermal results on the large interface die.

However when it came to the smaller interface die the Spire heatink dropped down to just good performance, close to that of the Dynatron. We found this interesting as we had expected the difference in results to be a bit larger than they ultimately proved to be. Not bad at all.