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 :
nVidia Quadro 4000 2GB GDDR5 PCI-E x16 2.0 Video Card Dell 731Y3 [Quadro 4000] - $169.00 : Professional Multi Monitor Workstations, Graphics Card Experts