Full Details from Amazon.com : http://www.amazon.com/gp/product/B0039YOMZI?tag=onigi-20

Sapphire Radeon HD5830 1 GB DDR5 2DVI/HDMI/DisplayPort PCI-Express Video Card 100297L

PCI-Express 20 x16 bus interface
256-bit DDR5 memory interface
Microsoft DirectX 11 Support
Microsoft Windows 7 Support
ATI Eyefinity Technology support up to 3 displays