EVGA GeForce GTX 680 2048MB GDDR5, DVI, DVI-D, HDMI, DisplayPort, 4-way SLI Ready Graphics Card Graphics Cards 02G-P4-2680-KR Base Clock: 1006MHz Boost Clock: 1058MHz Memory Clock: 6000MHz Cuda Cores: 1536 Pci-E 3.0. Minimum of a 550 Watt power supply Base Clock: 1006MHz Boost Clock: 1058MHz Memory Clock: 6000MHz Cuda Cores: 1536 Pci-E 3.0 2048MB GDDR5 256bit Nvidia SMX Engine, Nvidia GPU Boost, NVidia Adaptive Verticle Sync, Nvidia Surround, Support for Concurrent Displays, Nvidia PhysX, Nvidia 3D Vision Ready, Nvidia SLI Ready, Nvidia CUDA Technology