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 :
Used Nvidia Quadro 4000 2GB GDDR5 PCI Express x16 Desktop Video Card 38XNM - Walmart.com
Hewlett-Packard (HP) QG215AV - 2GB GDDR5 Nvidia Quadro 4000 PCI-E 2.0 Video Graphics Card - CPU Medics