Sapphire Radeon HD 5970 2 GB DDR5 Dual DVI-I / Mini DP OverClock Edition PCI-Express Graphics Card 100280OCSR PCI-Express 2.0 x16 bus interface 256-bit x 2 DDR5 memory interface Microsoft DirectX 11 Support Microsoft Windows 7 Support ATI Eyefinity Technology, support up to 3 displays