It took 3 different cards to finally find one that worked out of the box. Just change the syslinux configuration: add vfio-pci.ids=1912:0015 pcie_acs_override=downstream,multifunction initrd=/bzroot (your pci id will probably be different). I maxed out my external USB hard drive at 225MB/s, but I'm pretty sure it can run much faster, even in a x1 Gen 3 slot.
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