Used Nvidia Quadro 4000 2GB GDDR5 PCI Express x16 Desktop Video Card - Walmart.com
Amazon.com: Epic IT Service - Quadro 4000 for Mac, for Apple mac pro, 2GB GDDR5 PCI Express Gen 2 x16, DVI-I DL, DisplayPort, CUDA and OpenCL Profesional Board (Attn: Legacy Model) : Electronics