For those waiting on the info for the MSI Z170A M5 Gaming board and 7x GPU support I finally have it working on both of my boards.
1) Make sure you're running the latest BIOS!
2) Enable 4G
3) Set PCIe support to "Auto" - DO NOT MANUALLY SET TO GEN1. THIS CAUSES MAJOR ISSUES
4) Enable onboard graphics startup as first! I believe this is changing "PEG" to "IGD" or something in the Advanced BIOS
5) Plug your monitor into the ONBOARD graphics
6) Use either simpleminer-RX-v1093-4.11.rc8-16.60-enableexe0ANDips0.imgc or simpleminer-RX-v1093-4.11.rc8-16.60-enablerc60.imgc (sorry, I don't remember which I used!)
My 14x GPUs have been stable all night long!
Glad you were able to get this mobo working with 7 cards. Your instructions are substantively identical to mine from over a month ago (
https://bitcointalk.org/index.php?topic=1541084.msg18423032#msg18423032 and
https://bitcointalk.org/index.php?topic=1541084.msg18756984#msg18756984). Sorry for not pointing this out earlier, but other commitments (i.e., yard work) have been taking up all of my free time as of late. For whatever reason, there were a handful people who simply couldn't get their mobo to work for 5+ cards, so don't be surprised if people report back that your instructions don't work for them.
Also, this board can handle more than 7 cards.