I've got a fresh HD 6850 overclocked to 850 MHz with OverDrive.
I heard its possible to run it at 1000 MHz but how?
Please don't educate me about the risks of overclocking!
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This requires modification of the video BIOS. There are several utilities that can be used to do this, including ATIFlash and ATI Winflash. As this operation involves a low-level modification of the card firmware, if this is done incorrectly, the card will not be covered under warranty if a failure occurs. There are several guides online about this process; you may want to look at this rather outdated techPowerUp article on flashing the video BIOS.