Articles: Cooling

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Design and Functionality

ETS-T40-VD is hardly any different from most other tower coolers and its heatsink consists of aluminum fins pressed against the heatpipes and a cooling fan:



The cooler is 160 mm tall, which is quite normal for models like that. It is 139 mm wide and together with a fan and its rubber padding it is 93 mm deep:

At the same time I have to say that the weight of 610 grams indicated in the cooler specifications is pretty modest for a cooler of this size. We double-checked it using an electronic scale and it came out to 737 grams without the fan, which, however, is still not too much anyway.

The heatsink fins array is very dense. It consists of 52 aluminum fins, each 0.4 mm thick, pressed against 6 mm heatpipes with 1.8 mm gaps between one another:


The calculated effective cooling surface of the heatsink is 8600 cm2. To lower the airflow resistance and increase the cooling efficiency, Enermax ETS-T40-VD heatsink boasts two types of optimizations to it.

First of all, there is a cut-out hollow in the center of the heatsink and a few additional notches in the fin edges on both sides, which lower the airflow resistance:


Secondly, there are four triangle holes in the central part of the heatsink fins – SFF (Stack Effect) and a pair of smaller holes of the same triangular shape next to each of the heatpipes – VGF (Vortex Generator Flow):

The latter are supposed to ensure more effective heat transfer from the heatsink fins rather than reduce the airflow resistance. We have already seen something like that in Thermalright coolers (HR-02 in particular). Moreover, the heatsink has one more optimization called VEF (Vacuum Effect). Namely, the side edges of the heatsink fins are bent downwards thus closing the gaps and ensuring that the airflow is concentrated on heatpipes and fins. Note that the heatpipes are aligned inside the heatsink array in staggered order ensuring more even heat distribution over the heatsink.

The Enermax ETS-T40-VD heatsink has four heatpipes. The cooler is built using HDT (Heat Pipe Direct Touch) technology. Unfortunately, its implementation is more typical of the very first products with heatpipe direct touch, because the gaps between the heatpipes in the base are 2.1 mm big and filled with aluminum inserts:


Many cooling solution makers are already switching to second-generation direct touch, when there are no inserts of any kind between the heatpipes, or they are less than 1 mm wide. Enermax is about 2 years behind in this respect. Moreover, there are only four heatpipes, which is not enough to ensure efficient and most importantly even heat removal from the heat-spreaders of contemporary processors.

Enermax ETS-T40-VD is equipped with one 120 mm fan – U.R.VEGAS. It has four clear blades and a black frame:

The fan rotation speed is adjusted using pulse-width modulation method in the interval between 800 and 1800 RPM at 16-26 dBA of noise. The declared airflow is 33.26-75.98 CFM and the static pressure is promised at 0.97-2.28 mmH2O.

The fan uses a brand name Twister bearing, which is expected to last 100,000 hours or over 11 years of non-stop operation. At the same time, the fan’s startup voltage turned out pretty low – only 3.4 V and the maximum power consumption, which was supposed to be 5.4 W, didn’t exceed 4.5 W. Moreover, you can remove the fan impeller for servicing if necessary.

There are a lot of LEDs on the inside of the fan frame:

The user can select one of the seven lighting options with a button-switch. All of them look pretty awesome. See for yourselves:

Very impressive, don’t you think so?

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