I had stumbled upon a site that was selling a 4U Server chassis with 8 GPUs crammed into it, but cannot find it anymore. Price was about US 3k for a completed box including the Rx 470s they were putting in it. I figured it could be built for cheaper. Especially after cryptos are done. Full disclosure I have been mining a little bit of Ether to help fund my next build.

I think an 8 GPU unit will definitely show upon the electrical bill, but on the plus size it will be a nice sound machine and space heater.