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
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
Intel	Stock Pentium D	high	33.8	20.7	47.5
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
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
Apack	CF800	low	65.5	42.2	34.6
Apack	CF900	low	67.4	39.0	34.7
			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.

with a 150w heat load applied by the intel lga775 synthetic thermal test platform , the Apack Zerotherm CF900 heatsink achieves a very nice rise above ambient temperature of 32.9°C. The heatsink's 95mm fan was spinning at 2300RPM during these tests, and so it created about 48.3 dBA noise. Compared to the Intel Pentium D heatsink, the Apack Zerotherm CF900 operate less than a degree cooler under this thermal load. A heat load of 150W is roughly approximate to a stressed Intel Pentium D / Extreme Edition or Core 2 Quad class processor.

The Apack Zerotherm CF900 heatsink was next tested with an 85W heat load, where it maintained a 20.3°C rise over ambient. This is effectively the same as the stock Intel heatsink managed.

We've also included the synthetic temperature test results for the Apack Zerotherm CF900 heatsink with the 95mm fan rotating at its slowest speed. In actual use it would never maintain an 800RPM speed when the temperatures reach this level.

With its fan artificially forced to maintain a low speed of 800RPM the Apack Zerotherm CF900 heatsink operates silently at 34.7 dBA. The heatsink maintains a rise above ambient temperature of 67.4°C at 150W, and 39.2°C at the 85W heat load. At its lowest fan speed the stock Intel heatsink performs far and away better than this. Compared to the CF800 model, these temperatures are virtually the same, though at 85W the CF900 handles the heat somewhat better. To be clear though, the CF900 would not continue to maintain such a low fan speed under the aforementioned temperatures - we just wanted to see how it would react.

On the whole, Apack have managed to produce a heatsink which is effectively equivalent to the stock Intel Pentium D heatsink on the socket 775 platform. Between the all aluminum Apack Zerotherm CF800 and all copper Zerotherm CF900 there is less of a change. We would have expected the copper version to run a bit cooler at full fan speed, but the thermal test results are with a degree of each other when 150W of heat is applied. Bottom line, the Apack Zerotherm CF900 is a good heatsink, as good as the stock Pentium D cooler in fact.

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