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So far only Bitmain and GMO have attempted 7nm tech. GMO was a total failure, as efficiency was close to 16nm. Only Bitmain came close but with a very unreliable chip.
For now I'm still running my S9's. It's not worth the investment risk yet to upgrade with what is available in the market.
Hopefully they will improve but in these market conditions I seriously doubt it.
Hmm, I take it someone forgot about Canaan and their A921 which came out last October?
Very stable BUT - unfortunately its efficiency is just barely better than the A841.