Isn't it only half of that, 500MB/sec.? https://en.wikipedia.org/wiki/PCI_Express#History_and_revisions
PCI 3.0 would be ~1GB/sec. per lane.
I don't need more than the basic USB 3.0 per port, but If the total is only worth one port then I couldn't put much on it without a real slowdown.
The only...