Articles: Cooling

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If you take a look at the heatsink from above, you can note the nonstandard positioning of the pipes in the heatsink plates.

This wedge-shaped placement of the pipes is actually the key feature of the Cooler Master V6GT.

The first benefit is that the heat pipes are cooled more effectively by the air flow from the fans as is illustrated by the first three snapshots. Thanks to the V-shaped arrangement, the pipes are all open to the air flow and do not block each other. Another benefit is that the heat is distributed more uniformly in the heatsink (the three bottom snapshots). I guess the distribution is even more uniform than when heat pipes are arranged in a tessellated pattern, let alone linearly. By the way, the snapshots make it clear that the middle of the heatsink doesn’t contribute much to the cooler’s overall performance which is why some manufacturers split their cooler heatsinks into two halves. I wish the pipes of the Thermaltake FrioOCK were placed in this wedge-shaped manner, too!

I can add that the total area of the heatsink (excluding its various holes) is estimated at about 7960 sq. centimeters. This is average as today's top-end CPU coolers go.

The copper base below the heat pipes is at least 3 millimeters thick. The contact between the pipes and the base is ensured through soldering. The finish quality is rather mediocre: you can see and feel the traces of a milling machine. On the other hand, the surface is flat as is indicated by the thermal grease imprint left on it by my LGA1366 processor.

The V6GT is equipped with two newest XtraFlo fans (FA1225H12SPD).

Cooler Master claims that the wavy shape of the impeller blades and the small motor (35 millimeters) help these fans produce a strong air flow at a low level of noise. The speed of the fans is PWM-controlled within a range of 800 to 2200 RPM. The manufacturer specifies an air flow of 34.02 to 93.74 CFM at 15 to 38 dBA of noise. The static pressure is specified at 0.43 to 3.30 millimeters of water. The sleeve bearing called DynaLoop has a service life of 40,000 hours or 4.6 years. The impeller is 112 millimeters in diameter.

The fans are powered via a Y-shaped splitter:

The combined length of the cables is 390 millimeters, which isn't long. The PATA connector has nothing to do with the fans. It powers the highlighting in the top part of the cooler's plastic casing.

The button with Cooler Master logo selects the color of the highlighting from violet, red and blue. The highlighting can also be turned off altogether.


This feature seems odd to me. Cooler Master might have equipped its top model with something more useful than just pretty highlighting. The button might be replaced with a fan speed controller, for example, if the cooler were equipped with an operation mode selector (PWM/manual).

The V6GT can be installed on all modern platforms. The installation procedure is detailed in the user guide (a 1.73MB PDF). The included back-plate is used…

…together with these fasteners:

Having fastened them with screws through the PCB, you get a solid base for the rather massive cooler:

You have to remove the fans from the cooler before installing the latter. Otherwise, you will not be able to fasten the screws, even though the included key is very small.

The pressure is very high while the cooler design prevents it from turning around on the CPU.

The Cooler Master V6GT delivered the same performance irrespective of its orientation on the CPU socket.

There is 44 millimeters of free space from the bottom edge of the plastic casing (which is below the heatsink fins) to the mainboard surface. This provides enough room for installing and uninstalling memory modules with ordinary heatsinks or without any heatsinks at all. However, the Cooler Master V6GT will not be compatible with memory modules that have tall heatsinks.

The plastic boxes being compatible with standard 120mm fans, the V6GT's default XtraFlo can be replaced with, for example, Thermalright TR-FDB fans.

You will learn in the Tests section how this substitution affects the cooler’s performance. Let’s now take a look at the other product.

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