Running four cards at the moment. Using Nvidia Geforce 1060 6GB cards because they are more affordable, decent performance for the price, and use a lot less power than the 1070 or 1080's. I'm using an AsRock H110 motherboard designed for running up to 13 cards, but if you are going to run Windows( I learned this later) you can only run 8 cards on it. So use the Asrock H80(I think that is what it is if on Windows) which can run 8 cards. Will be doing a Linux change on this rig later to expand the number of cards.

I profit every day if you think of it in terms that I am creating something. My rig mines about $8-10/day at today's depressed prices. So say $200-300 per month. However, once I get it up to 8 cards that will be double. I don't like to think in dollars though. I just think...I have created .01 ethereum every day or approximately .3 ethereum/month.

I highly recommend figuring out how to do it on Linux though because Windows is expensive and does some stupid things that is a pain to get around.