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Akasa AK-961 Socket 775 Heatsink Review
Akasa AK-961 Socket 775 Heatsink Review
  88%   
Abstract: Akasa's AK-961 heatsink is made from a collection of very thin stacked aluminum fins, three copper heatpipes, and a small block of copper at the base.

 Manufacturer  Category  Published  Author 
Akasa   Cooling / Heatsinks   Nov 16, 2006   Max Page  

Home > Reviews > Page: Intel LGA775 Heatsink Temperature Comparisons
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
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
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
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 Akasa AK-961 heatsink achieves a very nice rise above ambient temperature of 30.0°C. The heatsink's 90mm fan was spinning at 3400RPM during these tests, and so noise levels were in the 60.7 dBA range - which is a little loud. A heat load of 150W is roughly approximate to a stressed Intel Pentium D / Extreme Edition or Core 2 Quad class processor. Compared to the stock Intel Pentium D heatsink listed in the above chart, the Akasa AK-961 was 3°C cooler thanks to its slightly quicker fan.

The Akasa AK-961 heatsink was next tested with an 85W heat load, and under those condition it maintained a temperature of 18.7°C rise over ambient.

One of the side benefits to open fan, and widely spaced cooling fin heatsinks such as the Akasa AK-961, is that exhaust air is directed right at components outside the CPU socket. Critical items like the Northbridge, voltage regulating MOSFETs, and even DDR-II memory can all reach elevated temperatures if there is insufficient airflow to cool things down.

I'm not quite sure why Akasa call the AK-961 a low noise heatsink, it certainly can operate with a really slow fan speed that is nearly silent, but even in a PWM compliant system there is no way the CPU would consistently run cool enough to warrant that. Looking at the results list for the 150W test, when the 90mm fan on the Akasa AK-961 spins at full speed what we really see is a good medium-to-high performance Intel heatsink. It's not the quietest heatsink out there, but the Akasa AK-961 does out perform the stock Intel solution and that's all that really matters.

Related Articles:

For more reviews on the latest heatsinks and cooling solutions, rely on FrostyTech's inventory of 350+ heatsink reviews. Here are a few other articles that you might enjoy as well...
- Akasa AK-960E Socket 775 Heatsink Review
- nPowertek NPH 775-1 Socket 775 Heatsink Review
- Thermaltake Jungle 512 Bifurcated Fin Heatsink Review
- Evercool PT02-9232CP Bifurcated Fin Heatsink
- Thermalfly I75DUH Bifurcated Fin Socket 775 Heatsink Review
- Intel Stock Pentium D Radial Curved non-Bifurcated Fin Heatsink Review
- Thermalfly F1-IACSHA Heatsink Review
- Zalman Fatal1ty FS-C77 Heatsink Review
- Antazone ASC1000 Copper Heatsink Review
- Zalman CNPS9500 AT Socket 775 Low Noise Heatsink Review
- Gigabyte 3D Rocket II Cooler GH-PCU23-VE Heatsink
- Zalman CNPS7700-Cu Low Noise Heatsink
- Thermalright Ultra-120 Low Noise Heatsink
- Zalman CNPS8000 Low Noise Heatsink Review
- Apack ZeroTherm BTF80 Heatsink Review>

 Previous Page ° Heat Sink Review Index  

Table of Contents:

 1:  Akasa AK-961 Socket 775 Heatsink Review
 2:  360° View - Akasa AK-961 Heatsink
 3:  Acoustic Comparisons and Base Surface Quality
 4: — Intel LGA775 Heatsink Temperature Comparisons

List all Akasa heat sinks that Frostytech tested?

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