max supported gpu for win is 8 gpu if im not mistaken, anything more than 8 go linux.
If you have >8 gpu better using Linux.
It's really simple if your use ewbf or Claymore
You must do only 2 things.
1-just download Linux version miner, paste your configs and run in on new OS. (really! like CTRL-C - CTRL-V)
2-of course install videodriver.