GIGABYTE ATI Radeon HD6770 1 GB DDR5 2DVI/HDMI/DisplayPort PCI-Express Video Card GV-R677UD-1GD Chipset: Radeon HD6770 Engine Clock: 850 MHz Video Memory: 1GB DDR5 Memory Clock: 4800 MHz Memory Interface: 128-bit Bus: PCI-Express 2.1 x16 RAMDAC: 400 MHz Stream Processor: 800 Max. Resolution: 2560 x 1600 Connectors: Dual DVI, HDMI, DisplayPort Thermal: Fansink Support Microsoft Windows 7 Support ATI Eyefinity Technology Support ATI CrossFireX Technology Support ATI Avivo HD Technology Support Microsoft DirectX 11 and OpenGL 4.1 System Requirement: 450W Power Supply with 1x 75W 6-pin PCI Express connector RoHS Compliant