|"....with 1920x1080 resolution?"|
Your ATI Radeon HD5670 cards are capable of that, but whether you monitor model supports that resolution and produces a clear and properly proportioned display at that resolution is a different matter.
All LCD, LED LCD, and Plasma displays have ONE "optimal" or "native" resolution that they look best set to (sometimes that's specified as it's maximum resolution instead). All other resolutions will not look as good.
If your monitor's "optimal" or "native" resolution is 1920x1080, the game display will be as it should be; if it's not, select a different resolution in the game that matches the monitor's "optimal" or "native" resolution