EVGA GeForce GTX 580 Superclocked 1536 MB GDDR5 PCI Express 2.0 2DVI/Mini-HDMI SLI Ready Limited Graphics Card, 015-P3-1582-AR NVIDIA 2-way, 3-way and 4-way SLI ready 4050 MHz memory clock and 1594 MHz shader clock PCI Express 2.0 GEForce GTX 580 Superclocked with 797 MHz core clock 1536 MB 384-bit 0.4ns GDDR5 memory GEForce GTX 580 Superclocked with 797 MHz core clock PCI Express 2.0 1536 MB 384-bit 0.4ns GDDR5 memory 4050 MHz memory clock and 1594 MHz shader clock NVIDIA 2-way, 3-way and 4-way SLI ready