PowerColor Radeon 4GB GDDR5 PCI Express 3.0 CrossFireX Support Video Card AXR9 290 4GBD5-MDH/OC AMD Radeon R9 290 Core Clock: 975MHz Interface: PCI Express 3.0 Memory Interface: 512-bit Memory Size: 4GB GDDR5 1 x HDMI/1 x DisplayPort/2 x DVI-D