Diamond 4870PE51GDI ATI Radeon HD 4870 GDDR5 1GB PCI-E Dual DVI Video Card PCI Express 2.0 Compatible 1024MB Memory with 256 bit memory interface and GDDR5 memory configuration 750 mhz core clock and 900 MHz memory clock Support for Microsoft Direct X 10.1 Shader Model 4.1 and OpenGL 2.0 Dual link DVI for dual monitor support