Model Z15 from Bitmain mining equihash algorithm which has a maximum hashrate of 840 kH/s for a power usage of 2780W. The Antminer Z15 (420Kh) incorporates a hash rate of 420 KH/S with the Equihash algorithm. Observe that hashrates are only equivalent concerning miners that use a similar algorithm. https://antminer-z15-second-hand98531.onesmablog.com/antminer-z15-420ksol-performance-explained-80365079