Nvidia Quadro K5000 4GB Graphics GDDR5 256-bit PCI Express 2.0 x16 Full Height Video Card - AliExpress
Amazon.com: Epic IT Service Quadro K5000 for Mac, 4GB GDDR5 PCI Express Gen 2 x16, DVI-I DL, DisplayPort, Supports Apple Boot Screen and Metal API, Professional Board : Electronics
NVIDIA Quadro K5000 for Mac VCQK5000MAC-PB 4GB 256-bit GDDR5 PCI Express 2.0 x16 Workstation Video Card - Newegg.com