MSI Computer Corp. AMD Radeon R9 290X Gaming OC 4GB GDDR5 2DVI/HDMI/DisplayPort PCI-Express Video Card R9 290X GAMING 4G Engine Clock: 1040 MHz (OC Mode); 1030 MHz (Gaming Mode); 1000 MHz (Silent Mode) Video Memory: 4GB GDDR5 Memory Interface: 512-bit Max. Resolution: 2560 x 1600 Connectors: 2x DVI-D Dual Link, HDMI, DisplayPort Bus: PCI-Express 3.0 x16