https://www.cryptocompare.com/mining/guides/how-to-build-an-ethereum-mining-rig/
Recent article. The problem, though, is trying to find the fast GPU's. AMD RX580's are ideal for this type of mining rig, however because this hobby actually still makes money, (albeit about a 9 month payback) everybody and their dog is getting into it. Where do you find your Graphics Cards? Stay Gold!