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

FrostyTech Synthetic Temperature Test Platform Results
Mfg.	Model	Ambient Temp.	27mm large copper block		27mm large copper block	Thermal pad	No. Fans	Fan Noise	Clip force
			50W		100W
Thermalright (high)	SLK-900U	20.0	31.6		40.5	none	1	very loud	easy
Cooljag (high)	CJC66IC-A	23.0	53.4		44.3	none	1	loud	easy
JMC	401100	19.5	35.1		47.4	grey	1	med	easy
Zalman	CNPS7000-Cu	21.0	35.1		48.7	none	1	low	easy
Taisol	CCP445172	20.2	37.7		50.9	none	1	med	easy
AVC	117140	22.6	37.8		50.4	none	1	med	med
Coolermaster	IHC-H71	23.0	37.0		51.1	none	1	loud	stiff
Arkua	8568	22.4	37.8		51.7	none	1	med	med
Zalman	CNPS7000A-Cu	25.9	39.2		52.5	none	1	low	easy
Thermal Integration (high)	TI-V7035TN	20.2	38.3		52.9	none	1	very loud	easy
Dynatron	DC1206BMY	19.5	38.1		53.1	none	1	med	easy
Dynatron	DC1207BMX	20.9	38.1		53.3	none	1	med	easy
Taisol	CEP447181	24.8	39.4		53.5	white	1	med	easy
Alpha	PAL8942	27.9	42.6		54.0	none	1	med	med
Intel	Stock 3.06GHz	24.9	39.9		55.0	none	1	med	easy
Arkua	Q85X-7J	24.6	41.3		56.5	none	1	med	easy
CoolJag	JVC661A	23.2	40.5		56.7	none	1	med	easy
Spire	SP411C5	25.2	42.5		56.9	white	1	loud	easy
Zalman	CNPS6500-AlCu	23.1	40.3		57.4	none	1	low	easy
TS Heatronics (6" fan dist)	NCU-1000	23.9	39.5		57.5	none	0	N/A	med
Taisol	CEP426151A	24.3	43.7		59.7	none	1	med	easy
Intel	Socket 478	22.4	41.8		59.8	carbon	1	low	med
Arkua	838T-7G	23.3	42.0		60.0	none	1	med	easy
Dynatron	DC1207BMW	23.2	42.7		61.1	none	1	med	easy
Arkua	8456X-8T	25.1	43.7		61.4	none	1	low	easy
Spire	SP420B8	25.3	42.7		61.5	none	1	low	easy
Dynatron	DC1206BM-S	22.4	43.2		62.0	none	1	med	med
AVC	117160	22.4	42.7		62.2	white pad	1	med	med
Evercool	NW9F715CA	23.8	42.9		62.3	none	1	med	easy
Aopen	ACP4LC	24.1	42.0		62.9	grey pad	1	med	easy
Scythe	Kamakaze	26.1	44.0		63.0	none	1	med	hard
Zalman	CNPS5700D-Cu	25.7	44.6		64.0	none	1	med	easy
Globalwin	VA476	28.7	49.5		68.0	grey	1	med	easy
Arctic Cooling	SuperSilent4 Pro	25.1	46.8		68.1	none	1	low	stiff
Dynatron	DC1206BMV	23.1	45.1		68.2	none	1	low	easy
Vantec	GSN-7015	22.4	47.5		69.0	none	1	loud	stiff
Cooljag (low)	CJC66IC-A	22.5	51.1		70.1	none	1	silent	easy
Verax	P16	21.8	49.2		75.8	none	1	none	med
Arkua	848X-6B	27.2	54.5		80.4	none	1	low	med
Dynatron	DC1U-B02	20.9	53.8		88.3	none	1	loud	stiff
			50W		100W

The initial FrostyTech Synthetic Temperature Test results look pretty favorably on the CJC66IC-A heatsink... at least in the high-RPM mode. Despite all that copper, the CoolJag heatsink fails miserably if the fans' thermistor doesn't receive the correct temperature data to initiate the increase in RPM.

For our tests, we ran the heatsink as it was to test the (low) setting. In order to test the full RPM (high) of the fan, we shorted the leads of the thermistor to simulate a situation where the fan was receiving sufficient ambient temperature data. Given that the thermistor is not in direct contact with the copper heatsink, it was not possible to test fan-speeds in between 1300RPM to 6000RPM.

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
Cooljag (high)	CJC66IC-A	10.4		21.3
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
Taisol	CEP447181	14.6		28.7
Arkua	8568	15.4		29.3
Intel	Stock 3.06GHz	15.0		30.1
Spire	SP411C5	17.3		31.7
Taisol	CCP445172	17.5		30.7
Arkua	Q85X-7J	16.7		31.9
Dynatron	DC1207BMX	17.2		32.4
Thermal Integration (high)	TI-V7035TN	18.1		32.7
Cooljag	JVC661A	17.3		33.5
TS Heatronics (6" fan dist)	NCU-1000	15.6		33.6
Dynatron	DC1206BMY	18.6		33.6
Zalman	CNPS6500-AlCu	17.2		34.3
Taisol	CEP426151A	19.4		35.4
Spire	SP420B8	17.4		36.2
Arkua	8456X-8T	18.6		36.3
Arkua	838T-7G	18.7		36.7
Scythe	Kamakaze	17.9		36.9
Intel	Socket 478	19.4		37.4
Dynatron	DC1207BMW	19.5		37.9
Zalman	CNPS5700D-Cu	18.9		38.3
Evercool	NW9F715CA	19.1		38.5
Aopen	ACP4LC	17.9		38.8
Globalwin	VA476	20.8		39.3
Dynatron	DC1206BM-S	20.8		39.6
AVC	117160	20.3		39.8
Arctic Cooling	SuperSilent4 Pro	21.7		43.0
Dynatron	DC1206BMV	22.0		45.1
Vantec	GSN-7105	25.1		46.6
Cooljag (low)	CJC66IC-A	28.6		47.6
Arkua	848X-6B	27.3		53.2
Verax	P16	27.4		54.0
Dynatron	DC1U-B02	32.9		67.4
		50W		100W

Weighing in at full fan speed with a noise output of 59 dB, and with a sizable possibility for vibration, means that the CoolJag CJC66IC-A isn't exactly the best heatsink when it is the most effective.

At lower fan speeds, the CoolJag CJC66IC-A fails the thermal tests miserably, in spite of its fully copper skived base and fins.

Ultimately, it is only when the high speed fans kicks in does this CoolJag heatsink really shine, and push its way to the No. 2 spot in this list of reference heatsinks. In that instance the thermal performance of the heatsink is quite remarkable, but who's to say any heatsink with a 6000RPM fan wouldn't be equally blessed?

If I had to describe the CoolJag CJC66IC-A in one way, it would be with an analogy to Dr.Jekyll and Mr.Hyde; when things get toasty, the CJC66IC-A's dark side certainly pokes through. When temperatures are calm, the heatsink is pretty low on the scale of coolers you'd want to have on your Pentium4 processor.

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