100% WORK,
Tested in Mac Pro & Windows
512MB GDDR3 PCI Express Gen 2 x16
DVI-I DL and Dual DisplayPort OpenGL, DirectX, CUDA and OpenCL Profesional Graphics Board
Note : No Apple welcome screen during start-up
100% work in OS 10.9
Spec: http://www.nvidia.com/object/product_quadro_fx_580_us.html