Articles: Cooling

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Design and Functionality

We see a large two-array Twin Tower heatsink that weighs 1070 grams:



However, Assassin doesn’t look too bulky even though its size is 160x144x154 mm:

Together with the fans the newcomer weighs 1378 g, which makes it one of the heaviest processor coolers out there these days (for your reference Phanteks PH-TC14PE weighs 1250 g, and Noctua NH-D14 – 1240 g).

Each of the two heatsink arrays sits on eight copper nickel-plated heatpipes 6 mm in diameter. There are a total of 98 fins (49 per tower), which are pressed firmly against the heatpipe with 2 mm gaps between one another:


The side edges of the heatsink fins are bent downwards covering the sides and concentrating the airflow around the heatpipes and fins. Each trapezoid-shaped fin is 0.5 mm thick and measures 140x126 mm at 50 mm height. This way the calculated effective heatsink surface area of the Deepcool Assassin cooler is about 12,100 cm2, which is one of the best among contemporary processor coolers. The gap between the two heatsink towers is 28 mm wide.

The heatpipes pierce each of the heatsink towers along the same horizontal line and have equal gaps between them (about 13 mm):


In our opinion, 50 mm heatsink is way too wide for this heatpipe layout. I suspect they could have made it a little narrower, which would have made the cooler a little smaller and lighter. I would also like to add that we didn’t notice any traces of soldering between the heatpipes and the heatsink fins.

As for the heatsink optimizations, we should definitely point out that the internal heatsink surface has notched profile, while the external surface has fins of variable height:

All heatpipes lie inside special grooves cut out in the base plate. The thinnest part of the cooler base plate is 2 mm:

Here we also didn’t notice any traces of soldering. The contact surface of the base is obviously too big even for LGA 2011 processors – 60x45 mm. However, the surface is ideally even and impeccably finished:

Despite its convex heat-spreader, the CPU left very good thermal compound imprints:


Although when we dismounted and installed the cooler again with a 90-degree rotation, we couldn’t obtain the same even imprints again:


Deepcool Assassin is equipped with two nine-blade fans: UF 140 and UF120:

I would like to remind you that their major peculiarity is the anti-vibration coating, which helps lower the level of generated noise. The 140 mm fan supports PWM rotation speed control and its speed may vary from 700 to 1400 (±10%) RPM creating maximum airflow of 80.28 CFM and generating 18.2-32 dBA of noise. As for the 120 mm UF 120, it works at a constant speed of 1200 RPM (with 52.35 CFM and 23.2 dBA respectively). We have absolutely no idea why Deepcool decided to go with a speed layout like that, since the minimal rotation speed of UF 140 will create resistance for UF 120, and its maximum rotation speed it will suffer from air insufficiency, because the 120 mm fan won’t be able to create a powerful enough airflow. It is very interesting, however, that Alpenfoehn selected a different speed layout for their identical K2 cooler – 1100/1500 (for 140 and 120 mm fans respectively), which makes much more sense in our opinion.

The fans are attached to the heatsink with two special wire clips, which ends catch on to the retention holes in fan frames and side slide into special slits on both side of the heatsink:


Assassin comes with an extra third set of fan retention clips, which you may use to attach a third fan, if you wish.

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