EVGA GeForce GT 640 Superclocked 1 GB GDDR5 64-Bit DVI-I HDMI Ready Graphics Card 01G-P3-2642-KR Base Clock: 1124 MHz Shader Clock: 1803 MHz Memory Clock: 5000 MHz Effective CUDA Cores: 384 1024MB GDDR5 64bit Memory NVIDIA SMX Engine, NVIDIA Adaptive Vertical Sync, NVIDIA Surround, NVIDIA Pure Video HD, NVIDIA 3D Vision Ready, NVIDIA PhysX technology, NVIDIA CUDA Technologies PCI express 2.0 Microsoft DirectX 11, OpenGL 4.2 Support, OpenCL support