HD 4000 series: The first overclocking tool is available
Up to now the Overdrive feature of the Catalyst Control Center (CCC) has been the only way to alter the clock speeds. The AMD GPU Clock Tool allows a bigger variability.
The CCC limited the maximum core clock speed of the HD 4870 to 790 Megahertz. Now Techpowerup offers the AMD GPU Clock Tool version 0.9.8. According to first user reports, AMD's flagship is working well if overclocked and clock speed up to 875/1,250 MHz are said to be stable with good air cooling. This would equal an performance increased by 17 respectively impressive 39 percent.
Additionally the AMD GPU Clock Tool is able to read the temperature of the graphics card. The program is available for download at Techpowerup or - for registered users - right here. Supported GPUs are the RV770 and the RV670.
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