Is this still a good setup to build? Can you start with just 1 or 2 GPUs or is that not worth the trouble? I see these prices have all gone up so is there any other cards that can work? Can you use old gaming systems like XBOX or PS to mine with? Thanks again for all the great info.
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Yes, you can just start with a couple GPUs - if you are buying the rest of the mining rig from scratch, however, make sure you get a motherboard with more PCIe slots so that you have the ability to add more in the future. I started with a simple 2-GPU mining rig and just added a third GPU as funds allowed.
Here is a good resource site for choosing what GPUs to buy: http://miningcharts.com
There is a comparison chart here http://miningcharts.com/gpu-mining-comparison-chart/best-price-and-power-usage/ that actually helps calculate purchase and power cost for GPUs over the course of a year. I was going to start very cheap and just get a 1050Ti or two as they are about $100 each, but based on power usage and purchase cost, instead of a few 1050 Ti's I went for a single 1070 Ti. It uses less power, and even costs less per hash to purchase (granted, if you only had $100 to spend you could get a 1050 ti and you would have to save up $400 more to buy a 1070 Ti)
Appreciate the info and if you have any additional resources I'll definitely take a look.