Also for large farmer, how are you networking your farm?
You can try to take a look at some videos on youtube like this one
https://www.youtube.com/watch?v=nXHAjBMLRqYI thought that you can divided it and if you are using this mobo
https://www.asus.com/id/Motherboards/B250-MINING-EXPERT/ and you can put up to 16 - 19 GPU to mine and try to combined it with some mining software and a little LCD to make you able to control your farm. I don't think if all those 500+ rigs are being putted in the same network.