Our colleague poparamiro managed to hit the 1200Mhz mark with a voltmodded Gigabyte HD 6870, boosting the VGPU from 1.17V to 1.51V in under 5C ambient and using a Thermalright Spitfire cooler to keep temperatures in check.



3DM05 @ 1200/1190 (click to enlarge)



I think this says alot about what the new Barts cards can do, as the voltage and temperature scaling are great.

You can find the full article here: Gigabyte HD 6870 - overclocking study - translation

To mods: if you feel this doesn't deserve a separate thread, feel free to join it with an existing HD 6870 topic.