GIGABYTE GeForce GTX 580 1.5GB GDDR5 PCI Express 2.0 2x DVI-I / mini-HDMI SLI Ready Graphics Card, GV-N580SO-15I Powered by Nvidia GeForce GTX 580 GPU and Integrated with industry's best 1536MB GDDR5 Memory and 384-bit memory interface GIGABYTE GTX 580 SuperOverclocked Edition w/ WINDFORCE3X Cooling Solution for maximum performance at whisper silent operation Core Clock: 855MHzMemory Clock: 4100MHz Ultra Durable VGA+ Edition:Proadlizer Added2 Oz Copper PCBTier 1 Samsung and Hynix MemoryJapanese GPU Gauntlet Sorting for World's #1 GPU Cherry-picking process. Only the strongest Processors survive the GPU Gauntlet Features 2x DVI-I / mini-HDMI outputs with HDCP Protection Minimum Recommended System Power Supply 750W with one 8pin and one 6pin external power connectors OC GURU World's best VGA Tweaking Utility providing the best combination of software and hardware overclocking Solid CapacitorsFerrite Core and Metal ChokesLow RDS MOSFET