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
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
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
Zalman	CNPS7700-Cu LED	low	41.3	25.0	34.9
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.

with a 150w heat load applied by the intel lga775 version of frostytech's synthetic thermal test platform, the Zalman CNPS7700-Cu LED yields a rise above ambient temperature of 33.5°C (49.8 dBA) at the fans' stock speed of 2000RPM. The processor equivalent of this heat load would be an Intel Pentium D / Extreme Edition or Core 2 Quad class CPU. At the much quieter fan speed of 1000RPM, temperatures rise by only a few degrees to 41.3°C (34.9 dBA) over ambient.

To measure the effectiveness of the Zalman CNPS7700-Cu LED heatsink on a Intel Core 2 Duo class processor we need to drop the heat load down to about 85W, to represent a stressed dual-core CPU. With 85W heat applied the Zalman CNPS7700-Cu LED heatsink generates a 20.6°C rise over ambient temperature at full fan speed, and 25.0°C over ambient at its lowest fan speed.

As a low noise heatsink for the socket 754/939/940 AMD Athlon64 platform the Zalman CNPS7700-Cu LED heatsink is very good at what it does. Only the a few other heatsinks post lower temperature results with similarly low noise outputs.

On the socket 775 Intel platform, the Zalman CNPS7700-Cu LED is equally well positioned as a low noise heatsink, however the design has clearly given way to the heatpipe-based Zalman CNPS9500 LED heatsink.

Where low noise is concerned it's hard to go wrong with the Zalman CNPS7700-Cu LED heatsink, and in this respect its thermal performance is still quite good on the both AMD K8 and Intel LGA775 platforms. However, the design is not quite as advanced as the Zalman CNPS9500 and new CNPS9700 heatsinks, which seem to have largely superceded the Zalman CNPS7700-Cu LED on both acoustic and thermal fronts.

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