FrostyTech.com Mk.II Synthetic Thermal Heatsink Test Results Results based on readings from a 38x38mm copper interface die with 125W heat load on the Mk.II Test Platform. Thermal Test values for each heatsink were calculated by determining the rise over ambient temperature at time of test. Information on Frostytech's test methodology is available here. Socket 939/940/754 compatible CPU heatsinks
manufacturer:	model no.:	*fan speed:	125w thermal test (°c)	noise level (dba)
AVC	Z7U7414001 (stock AM2)	high	17.0	63.0
Noctua	NH-U12		17.5	45.4
Gigabyte	G-Power Pro	high	18.6	71.9
Noctua	NH-U9		18.8	58.4
Coolermaster	Hyper6	high	20.5	54.7
Thermaltake	Venus 12	high	21.7	68.1
Cooljag	SFO-Q	high	22.2	60.6
ASUS	Starice	high	22.8	67.4
Zalman	CNPS9500 AM2	high	23.0	53.2
Arctic Cooling	Freezer 64 Pro		23.2	50.9
Coolermaster	Aquagate Mini	high	23.2	59.2
Thermaltake	Polo 735	high	23.4	68.0
Cooljag	SFO-H	high	23.6	60.6
Alpha	PAL-8150		23.7	58.9
Zalman	CNPS9500 LED	high	23.8	50.3
AVC	Z7U3301001 (stock 939)	high	24.6	59.9
Gigabyte	3D Cooler-Ultra	high	24.8	63.0
Scythe	Shogun	high	26.0	45.9
EKL	V8	high	26.3	57.5
Gigabyte	3D Rocket-Pro	high	26.9	56.7
Gigabyte	3D Cooler-Pro	high	27.0	62.5
Spire	SP601B3		28.3	48.9
Ajigo	MF064-074	high	28.8	60.3
Gigabyte	3D-Rocket		28.9	50.7
Vantec	Mach1	high	29.2	56.9
CoolJag	SFO-D(18SC)		29.6	64.0
Arctic Cooling	Alpine 64		30.5	43.9
Zalman	CNPS7000A-Cu	high	30.3	45.2
Dynatron	SK-V24		30.3	56.4
Zalman	CNPS7000-Cu	high	31.0	45.2
Coolermaster	Hyper48		31.7	43.6
Scythe	Kama SCKK1000		31.9	47.5
Scythe	Samurai SCSM1000	high	32.1	51.6
Zalman	CNPS7000B-CU	high	32.3	44.9
Thermaltake	Silentboost K8		32.3	49.7
Jetart	JAX801		33.2	53.5
Dynatron	A22		34.5	44.5
nPowertek	NPH K8-1		34.6	52.2
Ajigo	MF043-044 (stock 754)		35.0	45.4
Cooljag	SFO-Q	low	36.5	47.4
Verax	Quattro 1		36.9	30.9
Arctic Cooling	Silencer 64 Ultra TC		37.5	55.5
Gigabyte	NeonCooler 8-BL		37.7	42.0
Titan	TTC-K8ATB/825/SC		38.7	63.1
Evercool	K802-715		42.1	51.5
Spire	SP741B3		43.2	45.6
Evercool	Magic Cooler		46.6	55.5
ASUS	Starice	low	92.4+	34.4
			125w thermal test (°c)	noise level (dba)
*heatsinks are ranked according to the 125w thermal test results column (rise over ambient temp.). low temperatures with low noise levels are considered best. for reference heatsinks with variable-speed fans, only the high speed (12v) fan test result is included in the comparison sheet; more detailed results reside in each specific heatsink review.

The FrostyTech Mk.II thermal test platform stresses both socket 939 and socket AM2 class K8 heatsinks with 125W of heat, and once equilibrium is reached we note the rise in temperature (2nd column from the right) above that of the ambient temp. So in effect what we're doing is leveling the playing field and allowing comparisons between each heatsink in this reference list.

The Cooljag SFO-Q socket AM2 / 939 produces an excellent rise above ambient temperature at the fastest fan speed of 22.2°C, with just 60.6 dBA noise. When the Cooljag SFO-Q's fan speed drops to 2800RPM, the socket AM2 heatsink posts results about 14°C warmer.

At its quietest fan speed setting, the SFO-Q has a rise above ambient temperature result of 36.5°C, with 47.4 dBA noise - nice!

At its highest fan speed of 5000RPM, the Cooljag SFO-Q is an excellent heatsink although it is far too loud. Given that there is no direct way a user can influence the speed of the fan, it is unlikely that the Cooljag SFO-Q will operate in this mode very often. However, should case temperatures rise, it is comforting to know the heatsink has the capabilities of reducing temperatures substantially.

At its lowest fan speed, this heatsink is not nearly as good as the Zalman CNPS9500 AM2 or AVC Z7U7414001 heatsinks - both of which are fully AM2 compatible. At reduced fan speeds the AVC model produces about the same degree of noise, but the Zalman CNPS9500 AM2 is much quieter.

Bottom line, as a workstation or 3U server heatsink the Cooljag SFO-Q is a capable unit that excels when temperatures rise and an automatic response is desired. In this respect the heatsink is an "install it, and forget it" kind of cooler. It will do the job, but when it comes to low noise applications there are more suitable heatsinks for the socket AM2 platform to choose from.

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