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	Thermal Integration	TI-V77L	12.6	17.9		31.0	37.1
2	Dynatron	DY1206BH-638	14.8	23.8		29.0	44.9
3	Vantec	CCK-6027D	18.0	22.2		37.5	46.0
4	OCZ	Dominator	11.2	24.4		25.9	47.7
5	Akasa	Silver Mountain	19.6	24.9		38.4	49.5
6	Vantec	CCK-6035D-Retail	17.7	26.3		36.7	51.4
7	Swiftech	MCX370-0A	19.7	23.8		38.0	53.3
8	Thermaltake	Volcano 6cu+	13.8	28.8		32.1	57.9
9	Spire	5T060B1H3R	16.0	30.8		37.9	58.4
10	Thermalright	CB-6L	25.7	33.1		49.2	68.1
11	Fortis	A92	18.9	39.1		41.1	71.1
			50W	50W		100W	100W

Once again the performance of the Dynatron keeps it up at the top of our list of reference coolers. While the difference between it and the TI-V77L appears more pronounced than before the Model-638 still manages to hold its own. This is one very solid cooling solution (though noisy).

Now apart from the thermal performance of the Model-638 there is one other aspect that makes it a very desirable heatsink for the performance user - the tri-clasp clip.

This is one of only a few heatsinks that use all three mounting clasps to keep the heatsink in place, so for those of you who have broken off one from the socket, you finally have another option to consider.

Whether you have broken off one or both clasps, or even just worn them out from repeated heatsink removal and installation the Model-638 should be able to handle it.

Overall I would have to say that the Dynatron Model-638 is a great performance cooler for those of you who do not mind the extra noise output by the 38mm thick Delta fan. I would be hesitant to keep this fan and heatsink combo in an office or home environment because it does generate a lot of noise. If however you have a computer that needs some of the best possible cooling that is off in some far corner than this cooler is definitely one to consider hard - Just watch your fingers!