EVGA GeForce GTX 560 Ti Superclocked 1024 MB GDDR5 PCI Express 2.0 2DVI/Mini-HDMI SLI Ready Limited Warranty Graphics Card, 01G-P3-1563-AR GEForce GTX 560 Ti with 900 MHz core clock PCI Express 2.0 1024 MB 256-bit 0.4ns GDDR5 memory 4212 MHz memory clock and 1800 MHz shader clock NVIDIA 2-way SLI ready, Minimum 500W power supply and 2 6-pin PCI-E Connectors Required.