Information not expressly stated in the Final Rise above Ambient Temperature Test Results List concerns the pre-applied thermal pad (we remove this for testing any way), the number of fans on each heatsink, general fan noise and clip force observations, and ambient temperature measurements. As always, FrostyTech's Synthetic Temperature Test results for the Socket 478 Intel Pentium 4 platform are grouped according to the results for the 100W test die.

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

( Socket 478 - Pentium4 ) Rise Above Ambient Temp. (c)
Mfg.	Model	27mm large copper block		27mm large copper block
		50W		100W
Cooljag (high)	CJC66IC-A	10.4		21.3
Gigabyte (high)	PCU31-VH	12.5		22.3
Coolermaster (high)	Hyper6 KHCV81U1	12.4		23.4
Asus (high)	Crux P4 XB7N	13.9		24.4
Zalman	CNPS7000A-Cu	12.4		24.9
Alpha	S-PAL8952	12.7		25.4
AVC	Z7U7408001	12.9		25.8
Alpha	PAL8942	14.7		26.1
Gigabyte (high)	3DCooler-pro	15.6		26.6
Zalman	CNPS7000-Cu	14.1		27.7
AVC	117140	15.2		27.8
JMC Products	401100	15.6		27.9
Coolermaster (high)	Jet4	12.6		28.1
Taisol	CEP447181	14.6		28.7
Jetart	JAP416A	11.8		29.1
Thermal Integration	TI-A8736N	12.4		29.1
Arkua	8568	15.4		29.3
Intel	Stock 3.06GHz	15.0		30.1
Jetart	JAP407A	13.8		30.2
TTIC	NPH-101	13.4		31.2
Thermal Integration	TI-RV108N	15.9		31.7
Vantec	VP4-7245	18.0		31.7
Thermal Integration (high)	TI-V7035TN	18.1		32.7
Verax	Polargate AL S	17.0		32.9
AVC	Z7H2403012	15.2		33.4
Scythe (6" dist.)	NCU-2000	17.2		33.4
Cooljag	JVC661A	17.3		33.5
Scythe	Kamakaze	18.9		34.1
Zalman	CNPS6500-AlCu	17.2		34.3
Taisol	CEP426151A	19.4		35.4
Spire	SP420B8	17.4		36.2
Arkua	838T-7G	18.7		36.7
Intel	Socket 478	19.4		37.4
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
Evercool	CUW8-715	21.8		40.8
Arctic Cooling	SuperSilent4 Pro	21.7		43.0
Verax	P16Cu	22.0		45.1
Verax (high)	P17CuX	27.8		47.6
Verax	P16	27.4		54.0
Cooljag	2QC/180	29.3		60.1
Cooljag	E44C/180	33.8		66.9
Dynatron	DC1U-B02	32.9		67.4
		50W		100W

It's amazing what a difference a little extra copper can make when you are trying to cool a socket 478 processor in space as confined as that of a 1U server. Compared to the 1U Cooljag E44C/180 , which shares a nearly identical design, the extra bulk of the Cooljag 2QC/180 nets it a 6 degree Celsius temperature difference.

This places the Cooljag 2QC/180 at about the middle of the group of 1U heatsinks we have had the chance to test. Its thermal performance is good, and so long as installation with a retention mechanism is not required, a better choice than the E44C/180 model.

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