Gigabyte GeForce GTX 550 Ti 1GB GDDR5 PCI Express 2.0 DVI-I/HDMI/D-Sub SLI Ready Graphics Card GV-N550WF2-1GI Ultra Durable 2 Components - Ultra Cooling Low RDS(on) MOSFET Design - Low Power Loss Ferrite Core Chokes - Longer Life All-Solid Capacitor Design Windforce 2X Anti-Turbulence Parallel Inclined Cooling for maximum cooling efficiency with whisper quiet operation. Gold plated HDMI for optimum signal transfer between connections Features 1x DVI-I/1x HDMI/1x D-Sub (VGA) outputs with HDCP protection. Core Clock: 970 MHz - Memory Clock: 4200 MHz Supports NVIDIA SLI/3D Vision/CUDA/PhysX Technology Recommended minimum system Power Supply Unit 400W with at least one 6-pin power connector.