I have had three different PCIe x1 express cards in my Desktop over the years, I have NEVER had one automatically install the drivers.
Never had one successfully find the drivers searching on the web
Even when feeding it the driver disc when it asked.
Every single time I've had to manually go into device manager manually
select "Update driver", then manually select "Search in a specific place"
(And specify the driver disc in the optical drive)
What is this nonsense about the motherboard recognizing USB3.0?
That's the point of a PCIe card!
FWIW the current four port card (Two external and two internal) I have
is the first USB3.0 card I've had that worked near or at it's advertised speed...
But still If I need to do a large write operation either too or from
an external drive I tend to use eSATA.