Articles: Cooling

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Design and Functionality

First of all let’s take a closer look at the Akasa Venom Voodoo heatsink. It is 163.5 mm tall, 120 mm wide and 70 mm deep. It consists of six copper heatpipes 6 mm in diameter. An array of aluminum fins are pressed firmly against the heatpipes:



The bottoms of the heatpipes are fastened inside an aluminum pad, and the top of the heatsink is covered with a plastic frame with a yellow insert and Venom logo.

The heatsink contains a total of 45 fins, each 0.5 mm thick that are spaced at a 2 mm distance from one another. Each fin measures 120x70 mm. Taking into account the size as well as shape and other characteristics of the fins, the effective heatsink surface size makes 7,430 cm2. This is an average value for tower-type coolers.



The heatsink has a few prominent optimizations aimed at reducing the airflow resistance and lowering the noise. For example, the part of the heatsink when airflow enters is curved with a notched profile…

… and on the other side, where the airflow exits the heatsink, the heatsink profile is wedge-shaped with four additional notches on each side:

Moreover, I would like to mention that the heatpipes are arranged in staggered order inside the heatsink body, which will ensure more even heat distribution over the heatsink and faster heat transfer over all:

The base of Akasa Venom Voodoo cooler is built with direct-contact technology, i.e. the heatpipes form part of the base surface and contact the CPU heat-spreader directly. This cooler has six heatpipes and there are aluminum inserts no winder than 1 mm between them:

However, I have to point out that these inserts are sitting slightly deeper than the heatpipes. So, combined with uneven heatpipe edges in the base, we end up with almost 2 mm gaps between the heatpipes. You can clearly see that from the thermal paste imprints left by the cooler base on our LGA1366 processor:



Here I would also like to add that in any position the two exterior heatpipes of the Akasa Venom Voodoo cooler contribute very little to the overall heat transfer. And that is on a large heat-spreader of our LGA1366 processor. If we take LGA1155/1156 and. Of course, LGA775, these two heatpipes will be simply hanging off the sides and will not work at all. Other than that, the base is very even, although its finish is of barely acceptable quality.

The new Akasa cooler is equipped with two nine-blade fans with a black frame and acid-bright yellow impeller:

The “unique” S-Flow blade shape, according to Akasa, should generate 30% larger airflow compared with the traditional fans featuring classical blades. However, we have recently tested a Cooler Master 612 PWM cooler featuring an XtraFlo fan with similar looking blades and even smaller stator.  (the review will be up shortly). During our tests it wasn’t really that special, compared with Thermalright TR-FDB. However, it had only seven blades, and not nine…

The fans rotation speed can be controlled using pulse-width modulation method (PWM) in the interval from 600 to 1900 RPM. The maximum declared airflow should be 83.63 CFM and the noise should vary between 6.9 and 28.9 dBA. According to the info from the motor sticker, the fan current is 0.17 A, which should keep its maximum power consumption below 2.04 W:

True, our tests showed that both these fans consume no more than 4 W. their startup voltage was 4 V. the fluid dynamic bearing inside the fan motor should last at least 50,000 hours or 5.7 years.

The fans are installed for air intake and exhaust and are attached to the heatsink with a plastic frame. They do not sit on this frame directly, but hang on soft silicone mounts:

This fan retention approach is extremely simple and convenient. Moreover, it prevents any vibrations from being transferred to the heatsink, which also lowers the noise.

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