EVGA GeForce GTX 570 Superclocked 1280 MB GDDR5 PCI Express 2.0 2DVI/Mini-HDMI SLI Ready Limited Graphics Card, 012-P3-1572-AR GEForce GTX 570 Superclocked with 797 MHz core clock PCI Express 2.0, Minimum 550W power supply and 2 6-pin PCI-E Connectors Required. 1280 MB 320-bit 0.5ns GDDR5 memory 3900 MHz memory clock and 1594 MHz shader clock NVIDIA 2-way and 3-way SLI ready