EVGA GeForce GTX 580 1536 MB GDDR5 PCI Express 2.0 2DVI/Mini-HDMI SLI Ready Limited Graphics Card, 015-P3-1580-AR GEForce GTX 580 with 772 MHz core clock PCI Express 2.0 1536 MB 384-bit 0.4ns GDDR5 memory 4008 MHz memory clock and 1544 MHz shader clock NVIDIA 2-way, 3-way and 4-way SLI ready Minimum 600W power supply required An available 6-pin PCI-E power connector and an available 8 pin PCI-E power connector are required