i've managed to install 9 cards into one mb (asus strix z270f, windows 10 1703) but unfortunately none of ccminer forks support such a config
it just freezes the system when i run ccminer (tried tpruvot's 2.0, alexis's etc)
if i remove any card to get 8, ccminer works as usual
ccminer limit is 16, so should be another issue, try two instances to check
no, it will not work.
There is no miner on windows to work with > 8 cards.