DiRT 2 no ultra on dx11 card

Hey, I have an HD5770, and when I got into the options menu, some options are not available as ultra. They are locked on high. I re-installed Win7, and this didn't do the trick... am I missing something?
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  1. Okay, thanks.
  2. Best answer selected by Martin 71.
  3. This topic has been closed by Mousemonkey
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