PowerColor ATI Radeon HD6770 1 GB DDR5 VGA/DVI/HDMI PCI-Express Video Card AX6770 1GBD5-H Chipset: Radeon HD6770 Engine Clock: 850 MHz Video Memory: 1GB DDR5 Memory Clock: 4800 MHz (4.8 Gbps) Memory Interface: 128-bit Bus: PCI-Express 2.1 x16 RAMDAC: 400 MHz Max. Resolution: 2560 x 1600 Connectors: VGA; DVI; HDMI Thermal: Fan sink Support Microsoft Windows 7 Support ATI CrossFireX Technology Support ATI Stream Technology Support ATI Eyefinity Technology Chipset: Radeon HD6770 Engine Clock: 850 MHz Video Memory: 1GB DDR5 Memory Clock: 4800 MHz (4.8 Gbps) Memory Interface: 128-bit Bus: PCI-Express 2.1 x16 RAMDAC: 400 MHz Max. Resolution: 2560 x 1600 Connectors: VGA; DVI; HDMI Thermal: Fan sink Support Microsoft Windows 7 Support ATI CrossFireX Technology Support ATI Stream Technology Support ATI Eyefinity Technology Support ATI PowerPlay Technology Support AMD HD3D technology Support HDCP - High-bandwidth Digital Content Protection Support Microsoft DirectX 11, Shader Model 5.0 and OpenGL 4.1