1 of 1 people found this helpful
The ideal would be to have separate USB controllers, yes.
A starting point for your research into PCs could be the slim Intel NUC 7 mini PC with four USB 3.0 ports. It was released a year ago so is still quite up to date.
A new NUC 8 model is coming this Spring that has 7 USB 3.0 ports, according to the site below.
I believe the i7bnkq NUC 7 model is covered by this data sheet document:
I do not have a similar sheet for the forthcoming NUC 8 model. I assume both NUC 7 and NUC 8 have dedicated USB controllers for each USB 3.0 port, but I'll link our resident NUC expert on the forums, N. Scott Pearson - N.Scott.Pearson - into this conversation to get his input, just to be sure.