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performance-wise, yes. Looks-wise, a bit. You could probably get away with dx10 and some decent settings. I'd say use all medium settings as they don't look very different from high in most cases. I use dx11, all high except shadows with my 5770 and have 2AF at 1920x1080, so you shouldn't have any real issues.
I have the same GPU, get it overclocked via the CCC easily to 830/1325 on auto fans, will run pretty much most things you throw at it. I think the above OC's take it to the power of a standard 5770.
I have the same GPU, get it overclocked via the CCC easily to 830/1325 on auto fans, will run pretty much most things you throw at it. I think the above OC's take it to the power of a standard 5770.