Well, this is what the settings look like:
Primary
[Image: http://i.imgur.com/ZE8QBmS.png]
Secondary
[Image: http://i.imgur.com/wvH0lFX.png]
They're both at max resolution, same everything.
[Image: http://i.imgur.com/5DZPomN.png]
Edit: I've been messing around with the AMD control center, I'm able to scale the screen to fill the whole monitor with the right resolution, problem is that I'm unable to maintain the aspect ratio.