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
Thermalfly	I75DUH		37.8	22.8	48.7
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.

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 of both existing CPU families. With a 150W heat load applied by the Intel LGA775 version of FrostyTech's synthetic thermal test platform, the Thermalfly I75DUH heatsink yields a rise above ambient temperature of 37.8°C, with about 48.7dBA noise.

The Thermalfly I75DUH heatsink was also tested with an 85W heat load, and that resulted in a 22.8°C rise over ambient temperature.

If Thermalfly were to consider making any revisions to this bifurcated fin heatsink, it should probably be to bore out some copper from the center of this heatsink ( see example here ). As the I75DUH stands, the solid slug of copper directly behind the fan motor certainly isn't helping it to quickly shed heat... and may in fact be retaining heat in the one area with the least amount of aiflow passing over its surface. However, without further tests this is just speculation.

On the whole the Thermalfly I75DUH heatsink performs quite well for its compact size, and comparably low impeller speeds. The stock Intel Pentium D thermal solution operates just 4°C cooler, which indicates how close a race exists between bifurcated fin heatsinks of nearly identical proportions.

I think it is safe to say Thermalfly have created a good socket 775 heatsink in the I75DUH, even though it does not outperform the reference Intel solution, or several other coolers with similar noise outputs for that matter (ie. Zalman CNPS7700-Cu, nPowertek NPH-775-1, Apack Zerotherm BTF80).

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