I think the standard Windows 10 eXtensible driver would work on your USB 3.0 (XHCI) controller.
I'm wondering if the controller is disabled in the BIOS settings.
It would be in Advanced Mode BIOS Settings > Advanced tab > USB Configuration.
Image A: ports are on the motherboard/main board and can't be changed, would need a different board.
Image B: I have the same concern on an SFF/Small Form Factor machine, not enough room to assure sufficient airflow to prevent overheating. I could add a USB 3 PCIe card but there's less than half inch clearance from the video card which uses only a finned heat sink. Looking at the image suggests you could use the longer PCIe X4 slot for a PCIe X1 or PCIe X4 card with the ports on it, further away from the fan. You might want to check if you can add an additional case fan.
Not sure if this is helpful or not. I didn't see anything for USB Configuration, but then again this may be only the 2nd time I have looked at my BIOS. I did see a peripheral tab and saw the terms XHCI. Looks like the XHCI is enabled. Not sure what ECHI is but it is disabled. I have no documentation making it tough to know what I'm doing.
Again, thanks for your help.
You have Legacy USB Support enabled so that gives USB 2 support then when booted into an OS/Operating System will get the USB 3 drivers loaded. The EHCI is for the Enhanced USB 2 and XHCI is the eXtensible USB 3.
Actually I see 4 empty PCIe slot empty and will work for your choice of USB 3.0 cards. Although you might as well get one that supports USB 3.1 Gen 2 to future proof your self. Just make sure it contains both USB C and A ports
The short slot/socket is PCIe X1, next is a PCIe X4 and I can't tell for sure if the other 2 are PCIe or the older PCI. Looking at the "top" end of the slots shows white lettering on the motherboard. It's not unusual to have PCI slots for older Add-in cards which can be audio, network, analog ports such as for printers or communication devices, etc., all my Desktops have them.
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