... if most boards have TWO USB3.0 controllers? LIke here, I have *working* Intel and Asmedia. If the sensors/Rift are split between these 2x controllers, does this caveat "not more than 2x sensors at USB3.0" still apply?
How would there be bandwidth issues if, say, 2x are connected to Asmedia and then the Rift and 3rd sensor on Intel?
You can do it of you have two USB 3.0 controllers--most higher-end modern mobos will, but older/cheaper ones won't. It does mean that you're eating up a lot of your bandwidth that other devices might need, depending what else you have plugged into your PC.
I have three sensors on USB3.0, but I added a PCIe card to offset the load from my mobo.
You can try if you want, but USB 2.0 is actually preferable in most cases as the compatibility is better. In any case, the quality difference between 3.0 and 2.0 is not noticeable, so you will not see any major benefit going all USB 3.0 (but risk introducing problems).
