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If we are talking about energy efficiency nothing beats a gpu, specifically 750ti, which I have a bunch grinding at the pools, of course if monero goes up tremendously in value the dust you can mine with a cpu would make sense getting, now.

Currently GPU mining is 5x more profitable if you mine Ethereum or Ethereum Classic, then you can buy Monero if you want it.

Maybe mining steem is better then? Or is my CPU not that strong for it?
Thanks for your reply!