I was studying about how to build Bitcoin minning rig with ASIC instead of old GPU.
Tried several AMD ATI board but hash rate doesn't come out good.
Then I move to genesis-mining for clouding mining to get rid of all noise and expensive equipment.
Eventually sold out all old gears.
doing 120-130 mh/s eth with under a 2k spend. ROI is 45-60 days, more like 30-45 if the rate of eth keeps rising.
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Bitcoin is too expensive to mine, even with your electricity being free.
Look at some of the other coins, that are not as "difficult".