HIS PCI-Express Video Card (H685F1GD) Chipset: ATI Radeon HD6850; Engine Clock: 775 MHz; Video Memory: 1GB DDR5 Memory Clock: 4.0 GHz; Memory Interface: 256-bit; Bus: PCI-Express 2.1 x16; RAMDAC: 400 MHz Max. Resolution: 2560 x 1600; Connectors: Dual DVI; HDMI; DisplayPort; Thermal: Fansink Support Microsoft Windows 7; Support ATI CrossFireX Technology; Support AMD Eyefinity Technology; Support AMD PowerPlay Technology; Support AMD HD3D Technology; Support Stereo 3D Display/Glasses Support Dolly TrueHD and DTS-HD Master Audio technology; Support HDCP - High-bandwidth Digital Content Protection; Support Microsoft DirectX 11, OpenGL 3.2 500 Watt or greater power Power Supply Requirement