Similar to the thread linked below, inasmuch as I have a PCI card with two USB-3 ports that function without problems, but the two extra ports, connected through a cable from a connector on the card, time out when copying to a USB-3 stick .
Oddly, a USB-3 HDD works OK.
There is a reference in the link to changing the speed on the PCI - I don't see it in the bios.
It's an ASUS P7P55D-E motherboard.
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Thread: USB-3 Secondary Ports Fail.