Diamond 4870X2PE52GXOC ATI Radeon HD 4870 X2 PCI-Express 2GB GDDR5 Dual DVI Video Card 2 GB Memory with dual 256-bit memory interface and GDDR5 memory configuration Dual 800 mhz core clocks and dual 975 MHz memory clocks Support for Microsoft Direct X 10.1 Shader Model 4.1 and OpenGL 2.0 Up to 24X Custom Filter Anti-Aliasing Built-in HDMI and 7.1 surround sound