Cutting-edge integrated display support
    DisplayPort 1.2
        Max resolution: 2560x1600 per display
        Multi-Stream Transport
        21.6 Gbps bandwidth
        High bit-rate audio
    HDMI 1.4a with Stereoscopic 3D Frame Packing Format, Deep Color, xvYCC wide gamut support, and high bit-rate audio
        Max resolution: 1920x1200
    Dual-link DVI with HDCP
        Max resolution: 2560x1600
    VGA
        Max resolution: 2048x1536
From HD6450 spec
http://www.techpowerup.com/reviews/AMD/HD_6450/2.html引用:
The card has one analog VGA port, one full-size HDMI port and one DVI port. AMD's display output logic is clearly superior to what NVIDIA has to offer at this time. Vendors are free to combine four TMDS links into any output configuration they want (dual-link DVI consuming two links) - and use them all at the same time. AMD has also introduced DisplayPort 1.2 support with their new cards which allows the use of a DisplayPort hub to connect multiple monitors, or daisy chain them together.