Hi, I post this for the people who are having Black Borders on the screen.
For the example, I managed to install windows 8 RP on my computer, everything works fine, exept the graphics card : the screen wasn't full.
You only need to download catalyst control center, and set the overscan to 0
I hope this will help some people
There is a video (not made by me) : http://www.youtube.com/watch?v=-rzDg_hqoPg
(Sorry for my English)