Genuine HP NVIDIA Quadro 4000 PCIe 2GB GDDR5 Video Card 671137-001 608533-003 - Notebookparts.com
Refurbished: nVidia Quadro 4000 2GB GDDR5 PCI-E x16 2.0 Graphics Video Card With DVI and DisplayPort Outputs 38XNM Standard Height Workstation Video Card - Newegg.com
NVIDIA Quadro 4000 Mac Edition Specs | TechPowerUp GPU Database
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NVIDIA Quadro 4000 2GB GDDR5 Video Card VCQ4000-PB
NVIDIA Quadro 4000 by PNY 2GB GDDR5 PCI Express Gen 2 x16 DVI-I DL Dual Display | eBay