NVIDIA Quadro 4000 for Mac by PNY 2GB GDDR5 PCI Express Gen 2 x16 DVI-I DL, DisplayPort and Stereo OpenGL, DirectX (Boot Camp), CUDA and OpenCL Profesional Graphics Board, VCQ4000MAC-PB Chipset: Quadro 4000 Video Memory: 2GB DDR5 Memory Interface: 256-bit Bus: PCI-Express 2.0 x16 RAMDAC: 400 MHz Stream Processors units: 256 Memory Bandwidth: 89.6 GB/s Max. Resolution: 2560 x 1600 Connectors: DVI-I; DisplayPort Thermal: Fansink Support Microsoft Windows XP/ Vista/ 7/ Mac OS X 10.6.5 or later with MacPro3,1, MacPro4,1 or MacPro5,1 or later Support nVidia CUDA Architecture Support nVidia 3D Stereo Technology Support HDCP - High-bandwidth Digital Content Protection Support Microsoft DirectX 11, Shader Model 5.0 and OpenGL 4.0 Maximum Power Consumption: 142W