Sapphire Radeon HD 5550 1 GB DDR2 PCI-Express HDMI/DVI-I Graphic Card 100294L 550 MHz Core Clock 40 nm Process Technology 1024 MB Size, 128 -bit DDR2, 1600 MHz Effective 1 x D-Sub(VGA), 1 x Dual-Link DVI, 1 x HDMI PCI Express based PC is required with one X16 lane graphics slot available on the motherboard