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Now let's run DiRT 2, which should let us see how DirectX 11 taxes the new Radeons:
In DirectX 9 mode, the Radeon HD 5670 is once again keeping pace with the GeForce 9800 GT, delivering playable performance all the way to 1920x1200. However, once DirectX 11 features are enabled, the latest Radeon slows to a crawl. Even the powerful Radeon HD 5750 has difficulty keeping the minimum frame rate above 30 fps at 1680x1050.
DiRT 2 makes us question whether or not the Radeon HD 5670's capacity for DirectX 11 is truly usable. Only as more DirectX 11 games are released and benchmarked will we be able to get a clear picture. This is not a positive indication, though.