Diamond 4670PE31GDT ATI Radeon HD 4670 GDDR3 1GB PCI-Express DVI Video Card PCI Express 2.0 Compatible 1024MB Memory with 128 bit memory interface and GDDR3 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