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)
Thermalright	Ultra 120		17.8	10.6	53.7
Zalman	CNPS9700 LED	high	19.0	10.4	56.5
Apack	Zerotherm BTF90		21.8	12.7	52.1
Apack	Zerotherm BTF80		22.8	13.9	51.9
Akasa	AK-920	high	24.3	14.1	52.9
Thermalfly	F1-IACSHA	high	29.0	18.3	60.4
Akasa	AK-920	low	29.0	17.6	37.6
Zalman	CNPS9500 AT		29.6	17.3	53.3
Alpha Novatech	PRE9060M92P	high	29.9	18.5	51.5
Akasa	AK-961		30.0	18.7	60.7
nPowertek	NPH-775-1		30.1	18.8	50.1
Sunon	Waturbo		30.6	18.3	57.5
Apack	CF800	high	31.4	20.7	48.4
Thermaltake	Jungle512	high	31.6	20.4	60.8
Zalman	CNPS7700-Cu	high	32.9	19.7	50.7
Apack	CF900	high	32.9	20.3	48.3
Evercool	PT02-9232CP		33.3	19.9	63.3
Zalman	CNPS7700-Cu LED	high	33.5	20.6	49.8
Intel	Stock Pentium D	high	33.8	20.7	47.5
nPowerTek	SF775-2	high	34.7	21.1	64.6
Akasa	AK-960E		36.1	21.4	56.3
Thermalfly	I75DUH		37.8	22.8	48.7
Cooljag	OAK-H	high	38.5	22.9	55.7
Cooljag	OAK-H2	high	38.6	24.1	55.6
Intel	Stock Pentium D	low	40.3	23.9	40.5
			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.

The heat output from Intel processors varies widely between single and multi-core processors, so we've settled on two values which represent the upper limit (150W and 85W) of both existing CPU families.

With a 150W heat load applied by the Intel LGA775 version of FrostyTech's synthetic thermal test platform, the Akasa EVO 120 heatsink maintains a excellent rise above ambient temperature of 24.3°C. To achieve this result, there was 52.9 dBA noise from the 120mm fan spinning at its full speed of 2000RPM. The CPU equivalents of this test would be an Intel Pentium D / Extreme Edition or Core 2 Quad class chip. At the much quieter fan speed of 1000RPM, the synthetic CPU temperature rose by only a few degrees to 29.0°C (37.6 dBA) over ambient.

The Akasa EVO 120 heatsink was next tested with the reduced heat load of 85W. In this case the heatsink produced a 14.1°C rise over ambient at full fan speed. When the fan speed is reduced to quiet mode (1000RPM), the EVO 120 heatsink yields a temperature of 17.6°C over ambient.

On the whole, the thermal performance of the Akasa EVO 120 heatsink is excellent. This is a very capable low noise heatsink when running with a reduced fan speed in particular. Thermal performance increases when the fan speed is set at default setting naturally, but under these conditions the Akasa EVO 120 heatsink is somewhat audible, with a noise level of 52.9 dBA. No matter how you cut it though, the Akasa EVO 120 heatsink is a very competent choice for Intel socket 775 and AMD Athlon64 platforms (939/AM2).

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