Articles: Cooling

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Design and Functionality

Antec KÜHLER H2O 920 is built on Asetek 570LC platform that is why there is nothing principally new about its structure:

The system is pre-filled with the coolant and sealed. It consists of a radiator with fans and a pump with the processor water block connected to the radiator with two flexible tubes:

The key difference between Antec KÜHLER H2O 920 and the previous 620 model is the twice as thick radiator – 49 mm instead of 27 mm:

Unfortunately, the major downside of the radiator still remains – the entire thing is made of solid aluminum. I am sure that it will affect not only the cooling efficiency of the system but also its life span, because the system does include a copper water block. And no matter what type and quality of anti-corrosion additives the coolant has, copper and aluminum form a galvanic pair, which will eventually lead to inevitable corrosion.

Nevertheless, the 3-year warranty from Antec should protect the users from any possible problems like that.

The radiator is 151x120x49 mm big. It consists of 9 flat channels about 1.5-2 mm thick and corrugated band soldered to it creating 1.5 mm wide cells:

Two fittings come out of the radiator and the flexible tubes are firmly pressed against them. Each tube is 11 m in external diameter and 330 mm long:

Moreover, there are threaded loops on each side of the radiator for attaching fans.

The pump and water block form a single unit only 72x72x28 mm in size:


Beneath the plastic cover there is a pump with unknown declared performance. However, we know that it is built with a ceramic bearing that should last at least 50,000 hours:

The pump noise is claimed to be between 26 and 37 dBA, and its maximum power consumption shouldn’t exceed 3.1 W. The fittings on the pump can be rotated as needed, which makes it fairly easy to install the water block onto the processor and prevents the tubes from kinking.

The copper water block has multi-channel internal structure that consists of thin 6-7 mm tall ribs:

There is a layer of thick gray thermal interface already pre-applied onto the water block base surface. Here is a photo of the thermal paste imprint left by the processor heat-spreader on the water block base surface:

The base is pretty well finished, even though it is not polished to mirror-chine.

Antec KÜHLER H2O 920 comes with two 120x120x25 mm fans:

Compared with the 620 model, the new system not only has more fans, but each fan now has nine blades instead of seven:

Moreover, they have higher maximum rotation speed of 2400 RPM (it was 2000 RPM by Antec KÜHLER H2O 620). The minimal fan speed should be 700 RPM and the rotation speed is PWM controlled. The maximum fan airflow is declared in the specs to be at 110 CFM, and the noise – at 43 dBA. These numbers indicate that Antec KÜHLER H2O 920 will hardly be a quiet system. I have to add that the dual frictionless bearing in the fans has at least 50,000 MTBF.

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