I have a big experience and knowledge in GPU MINING. It was hard to mine a BITCOIN unlike ETHEREUM. I am mining ETH and earn more than 100 Dollar in just 1 month using 1 GPU only. And 200 Dollar for 3 GPU but it depends in your GPU model for the hash rate. The question there is the power consumption, Watts. This is the advantage of GPU, you can control the power consumption using the AFTER BURNER.

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