Lots of people also speculate the “fresh” V9 is practically nothing greater than an undervolted Antminer S7. There are two motives for that, 1 remaining that some individuals have allegedly managed to underclock their Antminer S7s and make them conduct being a V9 (~4TH/s with an influence draw of ~1kW). https://dailybookmarkhit.com/story18002924/not-known-details-about-bitmain-antminer-z9-mini