Graphics Engine: AMD Radeon™ HD 6970*2 Bus Standard: PCI Express® 2.1 OpenGL: OpenGL4.1 Video Memory: 4GB GDDR5 Engine Clock: 830MHz Stream Processors: 1536*2 Memory Clock: 5000MHz (1250MHz GDDR5) Memory Interface: 256 bit x2 DVI Max. Resolution: 2560 * 1600 DVI Output: YES X3 (Dual-link DVI-I*1, via Mini DP-to-DVI(active) adaptor*1, via Mini DP-to-DVI(passive) adaptor*1) HDMI Output: YES X1 (via Mini DP-to-HDMI adaptor) HDCP compliant: YES DisplayPort: YES X4 (Native Mini DP) Adapter/Cable Bundled: Mini DP-to-DVI(active) adaptor x 1 Mini DP-to-DVI(passive) adaptor x 1 Mini DP-to-HDMI adaptor x 1 CrossFire Bridge x1 Power Cable x 1 Software Bundled: ASUS Utilities & Driver Dimension: 12.4” x 5.1” x 1.6” inches