GIGABYTE AMD Radeon R9 270X - 2048MB GDDR5, 256-Bit Memory Bus, PCI Express 3.0, Connections : 1x DVI-I , 1x DVI-D, 1x DisplayPort, 1x HDMI Core: 1050MHz (BASE) / 1100MHz (BOOST) / Memory: 5600MHz DirectX 11.2, OpenGL 4.3, AMD GCN Architecture , AMD App Accelleration, AMD DH3D, AMD Catalyst, AMD Eyefinity, AMD Crossfire, HDCP Compliant