This question already has an answer here:
Is switching to Proof of Stake (PoS) makes GPU mining no longer available?
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marked as duplicate by Richard Horrocks, Nicolas Massart, eth♦ Jun 16 '16 at 8:29
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
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You could also look at ethereum.stackexchange.com/a/3531/405 – Nicolas Massart Jun 16 '16 at 8:17
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Actually, I think that one is a better fit :) – Richard Horrocks Jun 16 '16 at 8:19
