PowerColor ATI Radeon HD6770 1 GB DDR5 DVI/HDMI/DisplayPort PCI-Express Video Card AX6770 1GBD5-IDHG Chipset: Radeon HD6770 Engine Clock: 850 MHz Video Memory: 1GB DDR5 Memory Clock: 1200 MHz x 4 (4.8 Gbps) Max. Resolution: 2560 x 1600 Support Microsoft Windows 7 Support Microsoft DirectX 11, Shader Model 5.0 and OpenGL 4.1