The board features internal headers for both USB 2.0 and USB 3.0 (20-pin blue header) to support front-case ports.
If you already downloaded a PDF called "IPMMBFM_Manual.pdf" from some unknown site, here is how to verify it: ipmmbfm motherboard manual verified
Stop searching for on sketchy PDF sites. Go directly to HP’s support center and look up your desktop’s serial number. If the machine is too old to boot, use the HP Compaq 6300 Pro Maintenance and Service Guide – it is the same board, verified. The board features internal headers for both USB 2