Gigabyte ATI Radeon HD6870 1 GB DDR5 2DVI/HDMI/2x Mini DisplayPort PCI-Express Video Card GV-R687D5-1GD-B Chipset: Radeon HD6870 Engine Clock: 900 MHz Video Memory: 1GB DDR5 Memory Clock: 4200 MHz Memory Interface: 256-bit Bus: PCI-Express 2.1 x16 RAMDAC: 400 MHz Stream Processor: 1120 Max. Resolution: 2560 x 1600 Connectors: Dual DVI-I, HDMI, 2x Mini DisplayPort Thermal: Fansink RoHS Compliant Support Microsoft Windows 7/Vista Support ATI CrossFireX Technology Support ATI Avivo HD Technology Support HDCP - High-bandwidth Digital Content Protection Support Microsoft DirectX 11, Shader Model 5.0 and OpenGL 4.1