EVGA GeForce GTX770 Classified 4GB GDDR5 256bit, Dual-Link DVI-I, DVI-D, HDMI,DP, SLI Ready Graphics Card (04G-P4-3777-KR) Base Clock: 1150 MHz Boost Clock: 1202 MHz Memory Clock: 7010 MHz Effective CUDA Cores: 1536 4096MB GDDR5 256bit Memory NVIDIA TXAA, NVIDIA GPU Boost 2.0, NVIDIA PhysX, NVIDIA FXAA, NVIDIA Adaptive Vertical Sync, NVIDIA Surround, NVIDIA 3D Vision Ready, NVIDIA 3-Way SLI Ready, NVIDIA CUDA Technologies PCI express 3.0 Microsoft DirectX 11.1 API with Direct compute 5.0 Support, OpenGL 4.3 Support, OpenCL support