Hi DevBiker.
It's an older board that I inherited, and didn't know much about.
IEI, KINO-QM670-R20
https://www.icpamerica.com/uploads/product_usermanual/KINO-QM670_UMN_v1.00.pdf Page 38 - USB Connector Pinout Location
I've always used it as a home server, great for Plex and file server, but after updating the BIOS (big mistake), the PWM fan control stopped working. And since it's an old discontinued board... no support. And yes, I did walk back the BIOS, but it didn't help. That's why I chose to get a fan controller, and this one sounds great. The controller was meant to buy me a couple more years before I have to upgrade to a new motherboard.
I didn't realize how proprietary this motherboard is. I inherited it...