ATI Radeon HD 5770 1GB PCIe x16 Video Card HDMI DisplayPort Dual-DVI GCJ42 7120184001G Interface: PCI Express 2.1 x16 Video Memory: GDDR5 (1GB) Engine Clock: 4000 MHz (1000 MHz GDDR5) Graphics Engine: ATI Radeon HD 5770 Dimensions: 14 inches x 5 inches x 2 inches