A quick explanation of how to assess a Bitcoin miner for profitability... Let's take the S21 Pro. It has a hash rate of 234 TH/s. The world is hashing at 750M TH/s, so that machine will contribute to the following fraction of the world hash rate... 234/750,000,000 = 0.000000312 Cool. That means, if left on all day, it should generate the total world bitcoin reward for the day multiplied by that percentage... 450 bitcoin x 0.000000312 = 0.000 14040 bitcoin (14,040 stats)