What It Does: Sonnet’s Allegro Pro USB-C 8-Port PCIe Card enables users to connect and power up to eight high-performance USB peripherals to their computer at the same time and provides a full 10Gbps ...

Vantec's UGT-PC370A is a middle of the road solution for those that want a USB 3.1 upgrade for their system without having to upgrade to a new motherboard.

NVIDIA will be bundling an adapter. You'll need a beefy PSU though. It's a three-to-one converter, your power supply must still have at least three 8-pin PCIe power connectors available.