I built a 4 GPU Ethereum rig at my home! It cost me $1400, and hashes at 85 MH/s which will hopefully net me around $450 per month at current ETH rates.
I'm using the following core items:
(3 quantity) Radeon RX 470 GPU
Radeon RX 480 GPU
MSI Gaming 970 Motherboard
EVGA 1000W Gold Power Supply
Here's what it looks like all setup in my cheap little plastic box!
I'm using EthOS as the operating system, which has been AMAZING. Very very easy to use and troubleshoot... once you get the commands figured out.
Pro-tip. Watch an entire youtube video of someone setting up an EthOS mining rig :) Personally I really like the youtube channel Bit's Be Trippin.
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Thanks!