Zotac GeForce GTX 660 2GB GDDR5 PCI Express 3.0 HDMI DVI DisplayPort SLI Ready Graphics Card ZT-60904-10M 960 processor cores 192-bit memory bus Engine clock: (base) 993 MHz, (boost) 1059 MHz Memory clock: 6008 MHz DisplayPort 1.2 (4K ready) HDMI 1.4a (4K ready, w/ audio) DVI-I DVI-D (digital only) Quad simultaneous display capable HDCP compliant SLI bridge connector (2-way) NVIDIA GeForce driver Microsoft DirectX 11.1 (feature level 11_0) OpenGL 4.2 Microsoft Windows 7/8 x86/x64 ED 480p HD 720p HD 1080i Full HD 1080p Quad Full HD (4K) NVIDIA GPU Boost technology NVIDIA Adaptive Vertical Sync Technology NVIDIA SMX shader architecture NVIDIA PhysX technology NVIDIA CUDA technology NVIDIA 3D Vision Surround support NVIDIA SLI ready (2-way) 600-watt power supply recommended 140-watt max power consumption