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Well I've been mining since 2014, I built my first rig for around one thousand with two gpus in 2014. I was able to upgrade my board to the h81 in 2015, then i was able to add three more gpu's.

In 2016 I bought five rx 480 for 1200 cad, and sold my five rx 280x on ebay for 800 cad. So I'll just keep continuing this pattern every two years keeping up-to-date with the latest gpu's, and keeping my value high so I can spend little as possible for new gpu's.