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
Zalman	CNPS9700 LED	low	25.2	15.7	37.5
Thermalfly	F1-IACSHA	high	29.0	18.3	60.4
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
Thermalfly	F1-IACSHA	low	36.0	28.3	35.4
Akasa	AK-960E		36.1	21.4	56.3
Thermalfly	I75DUH		37.8	22.8	48.7
Intel	Stock Pentium D	low	40.3	23.9	40.5
nPowerTek	SF775-2	low	51.1	30.6	44.3
			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 cpus, so we've settled on two values which represent the upper limit of both existing CPU families. With a 150W heat load applied by the Intel LGA775 version of FrostyTech's synthetic thermal test platform, the nPowerTek SF775-2 heatsink yields an average rise above ambient temperature result of 34.7°C, yet with 64.6dBA noise!Given the speed of the fan, and the amount of noise here, this is not a very impressive result. At the much quieter fan speed of ~1500RPM, temperatures rise significantly to 51.1°C (44.3 dBA) over ambient with the same heat load.

The nPowerTek SF775-2 heatsink was also tested with an 85W heat load, and that resulted in a 21.1°C rise over ambient temperature at full fan speed. At a lower fan speed, temperatures held steady at 30.6°C over ambient.

From these results it's pretty clear that the nPowerTek SF775-2 heatsink offers up fairly average socket 775 heatsink performance at full speed. The fan noise levels necessary to achieve a rise above ambient temperature of 34.7°C, are particularly unimpressive however. Given these results, there isn't much incentive to switch from the stock Intel Pentium D heatsink, even though the nPowerTek SF775-2 is entirely made of copper.

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