Articles: Cooling

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Design and Functionality

As we have already mentioned before, Accelero Xtreme 7970 doesn’t differ much from the previous cooler modifications. It is equipped with the same three 92-mm fans 10 mm thick that sit inside a plastic casing. This casing sits on top of two heatsink arrays on five copper heatpipes 6 mm in diameter going through the copper base plate:

The cooler measures 288x104x54 mm and weighs 653 grams. According to the official specifications, Accelero Xtreme 7970 should be able to handle 300 W of peak thermal load, which is more than enough eve for the today’s most powerful graphics accelerators.

The heatsink consists of 77 aluminum fins (92x21 mm) and 7 fins (60x21 mm) that are pressed against the heatsinks at 1.8 mm intervals:

The fins thickness remained the same as before: 0.3 mm. the overall calculated effective heatsink surface also remained unchanged and equals 3,070 cm2. There is an additional aluminum heatsink (95x92 mm) right above the base plate, which removes the heat off the top of the heatpipes in the base plate area.

The heatpipes are evenly spread out in the base of the cooler at about 12-13 mm from one another. They lie inside special grooves and are soldered to them carefully:

The main difference between the new Accelero Xtreme 7970 and its predecessors – is the raised square on the cooler base, which stands out by about 1 mm above the base surface. As you know, “Tahiti” die (AMD Radeon HD 7970 and HD 7950) sits a little below the protective metal frame that is why this raised square on the base will ensure proper contact between the GPU and the Accelero Xtreme 7970 cooler.

There is a layer of highly efficient Arctic MX-4 thermal paste (8.5 W/m*K thermal conductivity) already pre-applied to the base. However, it is way too thick that is why most of the thermal paste will be squeezed past the edges of the chip onto the GPU board:


In my opinion, it would be way better to include a small pack of this paste with the cooler rather than apply a thick layer like that onto the base.

Accelero Xtreme 7970 has three 92-mm fans:

Their rotation speed can be adjusted using PWM method in the interval between 900 and 2000 RPM. The minima noise, which they measure in Sones, is claimed to be 0.5 Sone. The fluid-dynamic bearing inside the fans should last at least 6 years, and each fan should consume no more than 1.44 W (4.32 W for all three fans).

According to our tests, all fans consumed no more than 2.7 W of power. They can be connected to four- as well as three-pin power-connectors on the graphics card, or directly to the PATA connectors on the PSU using the enclosed PATA adapter.

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