Articles: Graphics

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The graphics card’s cooler is fairly simple. It consists of an aluminum heatsink and two heatpipes 6 mm in diameter, which pierce the heatsink in a zigzag pattern:

 The heatsink base is designed using heatpipe direct touch technology with a 1.5 mm gap between the heatpipes:

“Pitcairn Pro” die fits very neatly onto both heatpipes – they completely cover its entire surface as you can clearly see from the thermal paste imprint photo above.

The heatsink itself is very lightweight and inexpensive, because the fins are simply pressed firmly against the heatpipes. It is cooled with a 92-mm fan sitting inside a plastic casing:


Nine-blade fan impeller is made by PowerLogic and uses a ball bearing:

Its rotation speed is PWM controlled in the interval between 1600 and 3250 RPM (according to the monitoring data). This fairly simple cooler proves quite efficient on the factory overclocked PowerColor PCS+ HD7850:

Automatic fan mode

Maximum fan speed

In automatic fan mode the GPU temperature reached 71°C under maximum load and the fan was rotating at 2300 RPM. At maximum rotation speed of 3250 RPM the GPU temperature didn’t exceed 63°C. When we replaced the original thermal interface with Arctic MX-4, the results remained the same. Although the frequencies were already increased, we managed to overclock this graphics card a little more. Our graphics processor remained stable at 1180 MHz and the memory – at 5920 MHz:

In our opinion, it is a very good result for such a modest graphics card while its GPU voltage remained nominal. It is a pity, however, that increasing the voltage to 1.25 V didn’t have affect its overclocking potential in any way, especially since its cooling system had some efficiency reserves left (the temperature of the overclocked graphics processor under maximum load remained 77°C and the fan speed was only 2450 RPM):

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