Sapphire Radeon HD6770 1 GB DDR5 DVI/ HDMI/ DisplayPort PCI-Express Video Card 100328L Chipset: Radeon HD6770 Core Clock: 850 MHz Video Memory: 1GB DDR5 Memory Clock: 4800 MHz Memory Interface: 128-bit Bus: PCI-Express 2.1 x16 Stream Processors: 800 RAMDAC: 400 MHz Max. Resolution: 2560x1600 Connectors: DVI; HDMI; DisplayPort Thermal: Fan sink Support Microsoft Windows 7/ XP/ Vista Support ATI CrossFireX Technology Support AMD Eyefinity Technology PCI Express 2.1 x16 bus interface Full DirectX 11 support Microsoft Windows 7 Support OpenGL 4.1 support