FrostyTech Mk.II Synthetic Thermal Heatsink Test Results AMD Athlon64 / FX / X2 & Sempron class heatsinks Results based on readings from a 38x38mm copper interface die with 125W heat load on the K8 version of the Mk.II Test Platform. Temperature results listed for each heatsink were calculated by determining the rise over ambient temperatures at time of test. Information on Frostytech's test methodology is available here. Socket 939/940/754 & AM2 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
Apack	Zerotherm BTF90		20.5	52.1
Coolermaster	Hyper6	high	20.5	54.7
Apack	Zerotherm BTF80		21.3	51.9
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
Verax	Helado		24.3	36.3
AVC	Z7U3301001 (stock 939)	high	24.6	59.9
Zalman	CNPS8000	high	24.8	57.4
Gigabyte	3D Cooler-Ultra	high	24.8	63.0
OCZ	Tempest		26.0	51.6
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
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
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.

with a 125w heat load applied by the frostytech synthetic thermal test platform, the Apack ZeroTherm BTF80 heatsink yields a very nice rise above ambient temperature of just 21.3°C, with 51.9 dBA noise generated at its stock fan speed.

FrostyTech Mk.II Synthetic Thermal Heatsink Test Results Intel Pentium D / Extreme Edition & Quad Core class heatsinks tested at 150W Intel Core 2 Duo / Pentium 4 /Celeron class heatsinks tested at 85W Results based on readings from a 30x30mm copper interface die with 150W and 85W heat loads applied on the LGA775 version of the Mk.II Test Platform. Temperature results listed for each heatsink were calculated by determining the rise over ambient temperatures at time of test. Information on Frostytech's test methodology is available here. Socket 775 compatible CPU heatsinks
manufacturer:	model no.:	fan speed:	150w thermal test* (°c)	85w thermal test (°c)	noise level (dba)
Apack	Zerotherm BTF90		21.8	12.7	52.1
Apack	Zerotherm BTF80		22.8	13.9	51.9
Thermalfly	F1-IACSHA	high	29.0	18.3	60.4
Sunon	Waturbo		30.6	18.3	57.5
Zalman	CNPS7700-Cu	high	32.9	19.7	50.7
Thermalfly	F1-IACSHA	low	36.0	28.3	35.4
Zalman	CNPS7700-Cu	low	42.6	24.7	35.1
			150w thermal test (°c)	85w thermal test (°c)	noise level (dba)
*heatsinks are ranked according to the 150w 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.

with a 150w heat load applied by the intel lga775 version of frostytech's synthetic thermal test platform, the Apack Zerotherm BTF80 yields a rise above ambient temperature of 22.8°C with 51.9dBA. The CPU equivalents of this test would be an Intel Pentium D / Extreme Edition or Core 2 Quad class chip. With an 85W heat load, temperatures drop to 13.9°C over ambient.

The anthropomorphic shape of the Apack ZeroTherm BTF80's fins belies a rather clever balance between air pressure from the fan and depth of aluminum (ergo back pressure) which the air need pass over... where there is the least amount of airflow from the fan there is correspondingly a reduced amount of aluminum fin requiring cooling.

 For example, behind the tips of the fan blades there is 60mm worth of aluminum fin for air to cool. Whereas just behind the fan motor there is no aluminum whatsoever. By comparison, at the inside edge of the impeller blades the aluminum fins are 40mm thick - airflow at this location is not as strong as at the outer tips, but much higher than behind the motor.

The 92mm fan employs PWM to dynamically scale fan speed with compatible motherboards, but for the purposes of these tests the fan was run at its full speed of 2500RPM. The Apack ZeroTherm BTF80 is a remarkably good heatsink for socket AM2 or 939 AMD processors. At first glance it's just a heatsink that takes the form of a butterfly, yet in spite of these first impressions the thermal test results indicate that the Apack ZeroTherm BTF80 heatsink, just like the BTF90 model, deliver's great cooling performance as well.

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