PSA: If you are getting the "Poor Tracking Quality" error on your sensors even though you bought a USB expansion card try this:
Remove all USB devices from your computer.
Plug in the Oculus Rift Sensors and Headset to your Motherboard's USB ports. Make sure the Headset is plugged into USB 3.0. One sensors can be plugged into USB 3.0 and the other 1-2 sensors can be plugged into USB 2.0. You do not need to have 2 sensors plugged into USB 3.0.
Plug in the rest of your peripherals to your USB Expansion Card.
Restart PC.
The reason you may be getting the "Poor Tracking Quality" error is because your USB expansion card may be putting your USB devices to sleep even though you disabled USB selective suspend. When you put your computer to sleep the Rift sensors go to sleep and get the Poor Tracking Quality error when they wake up forcing you to unplug and replug the sensors which is really annoying. With the method above you keyboard and mouse may no longer work to wake your PC from sleep, but you your Rift sensors will not longer error out. If you need to wake your PC from sleep just press the power button.
FYI this was an issue on both my Inateck and Startech USB expansion cards with SATA/Molex power and even with USB power management disabled and Oculus Tray Tools running.
