EVGA GeForce GTX770 2GB GDDR5 256bit, Dual-Link DVI-I, DVI-D, HDMI,DP, SLI Ready Graphics Card (02G-P4-2770-KR) Graphics Cards 02G-P4-2770-KR Base Clock: 1046 MHz Boost Clock: 1085 MHz Memory Clock: 7010 MHz Effective CUDA Cores: 1536 2048MB GDDR5 256bit Memory NVIDIA TXAA, NVIDIA GPU Boost 2.0, NVIDIA PhysX, NVIDIA FXAA, NVIDIA Adaptive Verticle Sync, NVIDIA Surround, NVIDIA 3D Vision Ready, NVIDIA 4-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