Amazon.com: SEDNA - PCI Express 4 Port (4E) USB 3.0 Adapter - with Low Profile Bracket - (NEC/Renesas uPD720201 chipset) : Electronics
Buy SEDNA - PCI Express 4 Port (4E) USB 3.0 Adapter - with Low Profile Bracket - (NEC/Renesas uPD720201 chipset): USB Port Cards - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
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But far the best PCIe extension card I found.
This is a good hub:
https://www.amazon.com/gp/product/B00FR795WA/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
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