I have 13x1080ti running stable on W10, i3-7100, 4Gigs of ram.
Been a while ago when I installed this rig but from the top of my head the most important things are:
-set the PCI settings in the bios to GEN1.
-Try removing all the cards from the device manager make sure you have also hidden devices turned on.
-Install the cards in multiple phases and give windows the time to recognize them this can take a really long time!