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I've got a fresh HD 6850 overcloked 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. – DragonLord Jun 15 '11 at 12:19
Why don't you post this as an answer? Will the video BIOS void my guarantee? – Hedge Jun 15 '11 at 12:26
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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 There are several guides online about this process; you may want to look at this rather outdated techPowerUp article on flashing the video BIOS.

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I just read it's also possible using MSI Afterburner by enabling unofficial overclocking in the config-file. (It works even without a MSI-card).

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