GIGABYTE GeForce GTX 550 Ti 1GB GDDR5 PCI Express 2.0 2x DVI-I / mini-HDMI SLI Ready Graphics Card, GV-N550OC-1GI Powered by NVIDIA GeForce GTX 550 Ti GPU and Integrated with industry's best 1GB GDDR5 memory and 192-bit memory interface Gigabyte Ultra Durable VGA SeriesGPU Temperature 5% ~ 10% down Overclocking capability 10% ~ 30% up Power Switching Loss 10% ~ 30% down Gigabyte Custom-designed 100mm VGA Cooler for maximum performance and whisper silent operation Features 2x DVI-I / mini-HDMI output with HDCP protection Core Clock: 970MHzMemory Clock: 4200MHz Supports NVIDIA SLI / 3D Vision / CUDA / PhysX Technology Recommended minimum system Power Supply Unit 400W with one external 6-pin power connector