EVGA GeForce GTX570 HD 2560MB GDDR5 SLI Ready Graphics Card (025-P3-1579-AR) Core Clock: 732MHz Memory Clock: 3800MHz Shader Clock: 1464MHz CUDA Cores: 480 Memory: 2560MB GDDR5 320bit Microsoft DirectX 11 support, Nvidia CUDA Technology, OpenCL Support, Nvidia PhysX, PureVideo HD, 2-Way and 3-Way SLI, 3DVision Surround Technologies and Support