EVGA GeForce GTX TITAN HydroCopper Signature 6GB GDDR5 384-Bit, Dual-Link DVI-I, DVI-D, HDMI,DP, SLI Ready Graphics Card 06G-P4-2795-KR Base Clock: 928 MHz Boost Clock: 980 MHz Memory Clock: 6008 MHz Effective CUDA Cores: 2688 Memory: 6GB GDDR5 384bit NVIDIA TXAA, NVIDIA GPU Boost 2.0, NVIDIA PhysX, NVIDIA FXAA, NVIDIA Adaptive Vertical 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