Zotac GeForce GTX 780 Ti OC Edition 3GB GDDR5 PCI Express 3.0 HDMI DVI DisplayPort SLI Ready Graphics Card, ZT-70506-10P 2,880 processor cores 384-bit memory bus Engine clock (base): 941 MHz, (boost): 1006 MHz Memory clock: 7000 MHz DisplayPort 1.2 (4K ready) 2 x DL-DVI VGA (with included adapter) 1 x HDMI Quad simultaneous display capable HDCP compliant SLI bridge connectors (3-way SLI) NVIDIA GeForce driver Microsoft DirectX 11.2 (feature level 11_0) OpenGL 4.4 Microsoft Windows Vista/7/8 x86/x64 ED 480p HD 720p HD 1080i Full HD 1080p Quad Full HD (4K) 600-watt power supply recommended 255-watt max power consumption