Our Sapphire Radeon HD 6970 2GB GDDR5 DualFan could be overclocked to GPU and memory frequencies of 990 MHz and 5880 MHz, respectively. That's a good result.
Radeon HD 6970s do not usually overclock more than 950 MHz in terms of GPU frequency, but Sapphire's version has an efficient cooler and increases the GPU voltage to 1.2 volts. Unfortunately, the card’s memory chips weren't very good at overclocking.
The card didn’t get much hotter when overclocked. The GPU temperature reached 72°C, the fans rotating at 2660 RPM in the automatic regulation mode.
We can remind you that Radeon HD 6970s with reference coolers are 15 to 20°C hotter than the Sapphire card with DualFan cooler.