One reviewer said that it worked with his Rift and sensors and another person replied to a question saying that it works with their Rift, so I gambled on it. Works perfectly for my setup, Rift & 2 Sensors.
For me head tracking is definitely smoother on 3.0, could be cause my sensors aren’t the recommended “within 3ft” from my headset.
Word to the wise. The plug&play driver that Windows 10 automatically installs is crap. Follow the instructions that come with the card and download the drivers from “http://www.qicent.cc/”, install, then go to device manager and uninstall the “Fresco Logic” USB device, restart your PC and the correct drivers will now install automatically. Then restart the PC again for good measure. Works perfectly.
[QICENT 4 Ports PCI-E to USB 3.0 Expansion Card Windows Mac compatible](https://www.amazon.com/gp/product/B01M7Z623P/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1)