Sapphire Radeon HD6770 FleX 1 GB DDR5 2DVI/ HDMI/ DisplayPort PCI-Express Video Card 100328FLEX Chipset: Radeon HD6770 Core Clock: 850 MHz Video Memory: 1GB DDR5 Memory Clock: 4800 MHz Bus: PCI-Express 2.1 x16 Support Microsoft Windows 7 Support Microsoft DirectX 11, Shader Model 5.0 and OpenGL 4.1