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
Enzotech	Ultra-X	high	20.0	8.5	59.1
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
Thermalfly	I75DUB	high	29.5	16.8	68.5
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
Xigmatek	AIO-S80DP	high	32.4	21.4	55.0
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
LS Cable	SHS-T700		38.7	22.8	48.5
Thermalfly	I75DUB	low	47.0	28.5	38.7
Cooljag	OAK-H	low	95.3	54.5	29.5
			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 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 I75DUB heatsink yields a good rise above ambient temperature of 29.5°C, with 68.5dBA noise. When its' fan speed is dropped down to 900RPM, the temperature on the 150W test die rises to an average 47.0°C over ambient. Noise levels fall to a whispery 38.7 dBA.

The Thermalfly I75DUB heatsink was also tested with an 85W heat load, and that resulted in a very nice 16.8°C rise over ambient temperatures. With fan speed once again dialed down, the I75DUB heatsink reacts in a predictable manner and CPU die temperatures hold steady at 28.5°C over ambient.

 On the whole the Thermalfly I75DUB heatsink performs quite well at full fan speed (3600RPM), although we have to admit that the noise levels in this mode are far too audible to accept for any extended length of time.

On the plus side, the embedded thermistor is correctly located to allow the I75DUB to react to its actual temperature, and scale fan speed appropriately. That should allow the Thermalfly I75DUB heatsink to operate in the mid-range between the two noise levels we've quoted previously.

Still, the Thermalfly I75DUB heatsink edges out the stock Intel Pentium D thermal solution by 4°C at full tilt. It's an interesting comparison given both heatsinks are so close in proportion. Overall, this makes the Thermalfly I75DUB heatsink is a good solution, however it lacks the critical capability of cooling better than the stock Intel heatsink, with reduced noise levels.

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