Product Detail Chipset: Radeon HD 5850; Core Clock: 735 MHz Video Memory: 1 GB DDR5; Memory Clock: 4.2 GHz; Memory Interface: 256-bit Bus: PCI-Express 2.1 x16; RAMDAC: 400 MHz; Max. Resolution: 2560 x 1600 Connectors: Dual DVI-I; HDMI; DisplayPort; Thermal: Dual Slot Vapor-X Cooler with Auto Fan Control, 2 Ball Bearing Support ATI CrossFireX Technology; ATI Eyefinity Technology, support upto 3 displays; Microsoft Windows 7 Support; Support Microsoft DirectX 11 and OpenGL 3.1 . The "Sapphire ATI Radeon VAPOR-X HD5850 1 GB DDR5 2DVI/HDMI/DisplayPort PCI-Express Video Card 100282VXSR" is best product for you. We recommended Sapphire ATI Radeon VAPOR-X HD5850 1 GB DDR5 2DVI/HDMI/DisplayPort PCI-Express Video Card 100282VXSR