Amazon.com: 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 :
WS095AA - Used - HP NVIDIA QUADRO 4000 GRAPHICS CARD 2GB 256 CUDA CORES MEMORY INTERFACE 384 BIT GDDR5 MEMORY BANDWIDTH 89.6GB/S PCI-E 2.0 X16 COOLING SYSTEM ( 1 ) ONE HEATSINK (
Ars Reviews the Quadro 4000 Mac Edition: NVIDIA's sole Mac offering a promising start | Ars Technica
NVIDIA Quadro 4000 2GB GDDR5 Video Card VCQ4000-PB