You don't need nothing special on SOC Force. Just the following bios
https://www.dropbox.com/s/of0kx0m7jm8qhpz/Z170XSOCForce.rar?dl=0
only those 2 ports for XP.
https://www.dropbox.com/s/0pecc9wai1ynv7o/xp.jpg?dl=0
You can boot images from Z97 or X99. No need to build a new OS.