Amazon.com: Quadro K5000 for Mac, 4GB GDDR5 PCI Express Gen 2 x16, DVI-I DL, DisplayPort, DirectX (Boot Camp), CUDA and OpenCL Profesional Board - Epic IT Service : Electronics
NVidia Quadro K5000 4GB GDDR5 Mac Pro 2008-2012
PNY VCQK5000-PB NVIDIA Quadro K5000 4GB256-bit PCI Express 3.0 x 16 HDCP Ready Workstation video card - Newegg.com