Sapphire Radeon HD4870 X2 2GB DDR5 Dual DVI/TVO PCI-Express Graphics Card Unified Superscalar Shader Architecture OpenGL 2.0 support 256-bit DDR5 memory interface PCI-Express x16 bus interface Microsoft DirectX 10.1 support PCI-Express x16 bus interface 256-bit DDR5 memory interface Microsoft DirectX 10.1 support OpenGL 2.0 support Unified Superscalar Shader Architecture