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 :
Best HP 655079-001 2GB Quadro 4000 | Bulk
NVIDIA Quadro RTX4000 | NVIDIA Professional Graphics - Leadtek
HP Nvidia Quadro 4000 2GB GDDR5 Graphics Card 608533-003 DVI DisplayPort » eRecycler Online
Amazon.com: NVIDIA Quadro 4000 by PNY 2GB GDDR5 PCI Express Gen 2 x16 DVI-I DL, Dual DisplayPort and Stereo OpenGL, DirectX, CUDA, and OpenCL Professional Graphics Board, VCQ4000-PB : Electronics