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
Arctic Cooling	Freezer 64 Pro		23.2	50.9
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		30.3	56.4
Verax	Quattro 1	high	30.7	55.4
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
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
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.

The FrostyTech synthetic thermal test results clearly place the Arctic Cooling Freezer 64 Pro heatsink in a very good light. The heatsink handles itself very well, producing a rise above ambient temperature of 23.2°C on our test platform with a 125W heat load. The heatsink maintains a very competitive noise level of 50.9 dBA, which puts it on about equal footing with the Zalman CNPS9500 LED which is less than a degree warmer, and decibel quieter.

Compared to the more mainstream Arctic Cooling Silencer 64 Ultra TC heatsink, the Freezer 64 Pro maintains temperatures about 14°C lower, and with less noise output.

What isn't so great about Arctic Cooling's design are those little posts on the black plastic cap which the retention clip must lock into. It's easy to misalign the clip just slightly, impacting how firmly the Freezer 64 Pro is mounted to the processor. In fact, this very issue caused us to initially list the Freezer 64 Pro with a 26.9°C rise above ambient temperature.

The Arctic Cooling Freezer 64 Pro is a great lower-noise AMD Athlon64 socket 754/939/940 heatsink, but there are a couple other heatsinks which one-up it. If noise is not a consideration for your system, there are a half a dozen other heatsinks to select from which yield much lower temperatures, but with drastically higher noise output. The 2200RPM Arctic Cooling fan doesn't generate too much noise, but it is not a silent solution when running at stock speeds either. We've mentioned our concerns about the lifespan of the rubber dualaxial fan mounts, but without firm information either way on that question there really is no reason not to enjoy the benefits that the Freezer 64 Pro heatsink potentially has to offer.

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