yes my radeon shows up twice also , whats the total memory of your card....type dxdiag into the "run" box and go to display and under total approx memory it should show a figure
i think the radeon show up twice because it support 2 monitors, i have this but not 2 processors, if you look in the display properties/settings do you see a screen 1 at the front and screen 2 at the back?
The reason you have 2 processors in your device manager is because you have a hyper threading processor. Which tricks your computer into thinking you have 2 processors....at least that's what I heard.