We've certainly seen reports of USB incompatibilities with the M5A99X EVO but these reports are mostly from the 2016 launch window so it's not something there's not really a wealth of recent data points on this MoBo. There are definitely some anecdotal stories of people resolving their USB issues by getting a new controller in combo with this MoBo. We mostly see reports about the z170 as it's more common.
I would say that it's certainly possible for the USB ports on Asus motherboards to be incompatible as they're often running a controller system called Asusmedia rather than letting the CPU act as the host.
The only USB card we recommend is from the brand Inateck - they've proven to be the most reliable USB controllers with Vive/Valve hardware. This card is known to be compatible with Vive and is on the affordable end of the PC hardware spectrum.
To reach Viveport's customer service team, email email@example.com
To connect with a live support agent for hardware support, go to www.vive.com/support, click on "contact us" in the top righthand corner, and then opt to speak with a Live Chat agent David R
Technical Specialist - San Francisco, CA; Monday-Friday
Notice 1.Free Upgrade Support: Keep up to date! Download the latest drivers for free from the official Inateck website.2.Installation: Please go to the Inateck Website to view the PCI-E Card Installation Video.3.Please be aware that the computer cannot be booted from the USB drives connected to t...