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)
Gigabyte	G-Power Pro	high	18.6	71.9
Coolermaster	Hyper6	high	20.5	54.7
Thermaltake	Venus 12	high	21.7	68.1
ASUS	Starice	high	22.8	67.4
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	CNPS9500LED (clip parallel)	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
Gigabyte	3D-Rocket		28.9	50.7
Vantec	Mach1	high	29.2	56.9
CoolJag	SFO-D(18SC)		29.6	64.0
Zalman	CNPS7000A-Cu	high	30.3	45.2
Dynatron	SK-V24 (A41)		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
Verax	Quattro 1		36.9	30.9
Gigabyte	NeonCooler 8-BL		37.7	42.0
Titan	TTC-K8ATB/825/SC		38.7	63.1
Evercool	K802-715		42.1	51.5
Evercool	Magic Cooler		46.6	55.5
			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.

one of the down sides to thermally throttled fans is that if case temperatures remain too low, cpu temperatures can elevate due to the decreased rpm of the fan. the thermal test results for the dynatron a22 heatsink listed above are really only half the picture. the dynatron a22's rise above ambient temperature of 34.5°C is with the fan spinning at about 3000RPM - its the lowest speed. Because of the manner in which FrostyTech tests heatsinks, the ambient air temperature never rose enough to force an increase in the rotational speed of the Delta AFB0712HHB fan (where an ambient air temp of 42°C would have resulted in an impeller speed of 5700RPM). This factor is something we can normally circumvent by shorting out the contacts to the fans' thermistor, but in this case that sensor was too inaccessible.

Based on past experience, a rise above ambient temperature in the mid 20's would have been reasonable had the Dynatron A22's fan been spinning at the full 5700RPM. However, as we have not tested this, that potential will have to remain in the realm of speculation.

Considering the test results that we were able to compile from the Dynatron A22 operating in its default configuration, the heatsink certainly makes for a nice quiet solution. Temperature levels are leaning towards the warmer side of the scale, but that is most certainly due to the low-noise fan speed. The Dynatron A22 is a good heatsink which fulfills the role of cooling an AMD Athlon64 processor satisfactorily, but it would have been better if the thermal throttling had been left up to the BIOS and AMD's Cool 'n Quiet. What we have here is a lot of wasted potential, unfortunately.

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