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
Zalman	CNPS9500 AT		29.6	17.3	53.3
nPowertek	NPH-775-1		30.1	18.8	50.1
Sunon	Waturbo		30.6	18.3	57.5
Thermaltake	Jungle512	high	31.6	20.4	60.8
Zalman	CNPS7700-Cu	high	32.9	19.7	50.7
Evercool	PT02-9232CP		33.3	19.9	63.3
Intel	Stock Pentium D	high	33.8	20.7	47.5
Thermalfly	F1-IACSHA	low	36.0	28.3	35.4
Thermaltake	Jungle512	low	37.8	22.2	53.7
Intel	Stock Pentium D	low	40.3	23.9	40.5
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.

frostytech's Intel LGA775 synthetic thermal test platform applies a 150W heat load which approximates a stressed Intel Pentium D / Extreme Edition or Core 2 Quad class processor. Once equilibrium is reached we note the rise in temperature above that of the ambient temperature. In effect, what we're doing is leveling the playing field and allowing comparisons between each heatsink in the Intel LGA775 reference list above. The far right column identifies the noise level of each cooler, and naturally the lower this value the better.

With a 150W heat load applied to it, the nPowertek NPH 775-1 heatsink produces a temperature of 30.1°C over ambient. To put that in perspective, it's actually about 3-4°C cooler than the reference Intel Pentium D heatsink!

The 80mm fan generates a moderate 50.1 dBA, which will be somewhat audible outside the computer case.

To accommodate other Intel processors which run cooler than quad-core and Extreme Edition chips, like the Intel Core 2 Duo for example, FrostyTech also tests Intel LGA775 heatsinks with an 85W heat load. In this temperature test, the nPowertek NPH 775-1 heatsink maintains a 18.8°C rise above ambient temperature result.

As socket 775 thermal solutions go, the nPowertek NPH 775-1 heatsink is a good unit. Yet, since it does not utilize a 4-pin Pulse Width Modulation (PWM) fan that can be controlled by the BIOS to manage noise, it may find itself side stepped by consumers who want a heatsink that constantly scales its fan speed to meet thermal demands. Low noise is after all the biggest trend in heatsinks this year.

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