Thank you for the quick response!
I wanted to know why are there TWO host controllers,. if all 5 USB ports (even the inside header) are going through one controller? The second controller isn't used at all?
My device manager looks like this: http://postimg.org/image/7sf36jjt5
From this I assume it has two completely separate usb host controllers, which each may have several ports.
So the question is: are there more USB headers on the motherboard which are on the other controller?