I have a r9 290 windforce with a 4770k. 6x asus vn248h-p screens, your MST hub (3x hdmi), other screens in remaining ports. I have gotten it up to 5 screens. 2 on the hub, 3 on other inputs (1x hdmi, 2x dvi passive to hdmi). Even with other 3 screens unplugged I can only get the hub to use 2 screens. So its not the other inputs. Its me being unable to get the hub to use 3 screens. Getting close to when I need to return everything if that is the case. It is for my racing/flight sim set up. If we could talk on the phone that would be ideal, I would honestly paypal someone $50 to get this working.