For an all aluminum heatsink the Cooljag seems to be performing at about middle of the road for this list of reference heatsinks. Thermally we are seeing what looks like a slight advantage over the stock Intel heatsink, but we'll have to move forward and see the final rise above ambient results to know for certain.

Rise Above Ambient Temp. (c)
Mfg.	Model	27mm large copper block		27mm large copper block
		50W		100W
Thermalright (high)	SLK-900U	11.6		20.5
Alpha	PAL8942	14.7		26.1
Zalman	CNPS7000-Cu	14.1		27.7
AVC	117140	15.2		27.8
JMC	401100	15.6		27.9
Coolermaster	IHC-H71	14.0		28.1
Arkua	8568	15.4		29.3
NengTyi	XPC5000	14.6		30.1
Taisol	CCP445172	17.5		30.7
Dynatron	DC1207BMX	17.2		32.4
JMC	400124	17.1		32.6
CPUMate	DIA-10500	16.5		32.7
Thermal Integration (high)	TI-V7035TN	18.1		32.7
Cooljag	JVC661A	17.3		33.5
Dynatron	DC1206BMY	18.6		33.6
Zalman	CNPS6500-AlCu	17.2		34.3
Taisol	CEP426151A	19.4		35.4
Arkua	838T-7G	18.7		36.7
Glacialtech	Igloo 3300	18.1		37.1
Intel	Socket 478	19.4		37.4
Dynatron	DC1207BMW	19.5		37.9
Zalman	CNPS5700D-Cu	18.9		38.3
Vantec	CCK-7025	18.4		38.4
Titan	TTC-MT3AB	18.7		38.4
JMC	400094	20.5		38.9
Globalwin	VA476	20.8		39.3
Dynatron	DC1206BM-S	20.8		39.6
AVC	117160	20.3		39.8
Eumax	DW-45	21.4		40.1
Dynatron	DC1206BMV	22.0		45.1
Vantec	GSN-7105	25.1		46.6
Arkua	848X-6B	27.3		53.2
Dynatron	DC1U-B02	32.9		67.4
		50W		100W

In the final rise above ambient results the Cooljac JVC661A performs just about dead center in this list of reference heatsinks. The results are better than that of the stock Intel heatsink, but only by several degrees. Still, you have to give it to Cooljag for bringing a new technology to market which is competitive, and doesn't necessarily have to rely upon copper.. copper... copper.

Personally speaking, while I like to see copper heatsinks in my own machine, they do add weight and cost more than their aluminum counterparts. Aluminum makes for inexpensive heatsinks which I'm sure we can all agree is a good thing.

First off we have the triangular shaped base to consider. This feature is different from most heatsinks which have a flat base at the bottom of the fins. This area of the base of the heatsink also happens to be at the center of the heatsink which typically receives the least amount of airflow from the fan.

This is generally known as the 'dead spot' since the fan's motor is located directly above causing air in this space to stall. By angling the base upward in this region, I'd guess that the effect of the standing air will be lessened. Then we have the nifty 'V-Type' angled skived fins which should put more fin-material directly in the path of air flow which is at the highest velocity. Overall this leaves us with a pretty good aluminum cooler that doesn't produce all that much noise.

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Here are a few other articles that you might enjoy as well...

1. Vantec CCK-7015 1U Copper P4/Xeon Heatsink Review
2. Dynatron DC1206BM-V 1U Heatsink
3. JMC Phoenix 70 Radial Fin Heatsink
4. Arkua 848X-6B 1U Heatsink Review
5. Thermalright AX-7 Socket A heatsink