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Amazon.com: Lenovo Quadro K4000 Graphic Card - 3 GB GDDR5 SDRAM - PCI Express 2.0 x16 0B47393 : Electronics
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PNY NVIDIA Quadro K4000 3GB professional GPU Workstation Video Graphics card GDDR5 PCIe x16 - Newegg.com
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Refurbished: IBM Nvidia Quadro K4000 Graphics Card 3GB GDDR5 Memory PCIe 2.0x16 192-Bit Full Height Bracket, 03T8312 - Newegg.com
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