well im using many model sims including realflight g3 and fms and so on and i have had them all set at full and they have been perfect, the screen im using is an lg lcd 42 inch 1080p hd and i have everything linked up to that in hd so the tv will take my cards max resalution which is 1920 x 1080 in 32 bit hd mode
hope this helps whats the name of your sim you are using