EVGA GeForce GT 640 2048MB GDDR3 Dual DVI, mHDMI Graphics Cards 02G-P4-2643-KR Microsoft DirectX 12 API (feature level 11_0) Support GPU Clock: 901 MHz Memory Clock: 1782 MHz CUDA Cores: 384 PCI-e 3.0 2048MB GDDR3 128bit Nvdia SMX Engine, Adaptive Verticle Sync, Nvidia Surround, PureVideoHD Technologies Blue-ray 3D, DirectX 11, CUDA, PhysX, TrueHD, Nvidia 3D Vision, OpenGL 4.2 and Open CL Support