Model Z15 from Bitmain mining equihash algorithm having a utmost hashrate of 840 kH/s for a power use of 2780W. The Antminer Z15 (420Kh) has a hash level of 420 KH/S Using the Equihash algorithm. Observe that hashrates are only equivalent between miners that use precisely the same algorithm. https://antminer-z15-second-hand21975.techionblog.com/39521796/antminer-z15-overclocking-explained