NewerTech® : Storage : MAXPower 2-port eSATA 6Gb/s & 2-port USB 3.0 PCIe Controller Card for Mac Pro 2006-2012
T7400: Use both PCIe 2.0 x16 slots, one for video one for storage? | DELL Technologies
PCI Express 3.0 x16 graphic card on PCI Express 2.0 x16 slot? | Tom's Hardware Forum
Amazon.com: 3 USB 3.0 Ports and 1 USB 2.0 Port PCI Express (PCIe) Expansion Card (2 USB Type-A and 2 USB Type-C Ports), Desktop PC Host Card Support Windows 10/8/7/XP and MAC
Can a PCI 2.0 graphic card run in a PCI 3.0 slot? - Quora