Summer is here, and miners are using more power as their fans work harder to keep them cool.  Are your power cost projections accurate?

For both miners and cryptocurrency mining hosts  who have created power cost models around Bitmain’s stated 1.323 kW power usage, they’re left with a power bill to squabble over when they learn that a not-overclocked S9 13.5 th is going to use 1.5674 kW.  That’s right – we measured all of our client S9 miners and they’re ALL way over.

At $80 per kW hosting, that’s the difference between $105/mo and $125/mo

At $80 per kW hosting, that’s the difference between $105/mo and $125/mo.  That is no small margin easy to absorb. One of the data centers I work with is a .5 MW (small) sole-proprietor for whom his capacity of 300 S9’s will give him a bill of plus $6,000 / month. In the summer months, the miners are using more power than they otherwise will due to the fans working harder…so we expect a higher bill, but not as high as we’ve seen. And we’ve only (so far) tested the S9…we’ve got 16 other miners on our rate card. And this is the small data center!

I say “give him a bill” because it’s not always entirely clear WHO is going to pay the extra bill.  Hosting companies sometimes sell a flat rate per make/model, and sometimes they have clauses about power usage for this case exactly.

Bitmain Antminer S9 13.5 th - listed as 1323 W, reading in at 1567 W.

Bitmain Antminer S9 13.5 th – listed as 1323 W, reading in at 1567 W.

I’ve had to break the news to clients and some are having a difficult time believing Bitmain could be so far off.  It shouldn’t come as a surprise to be told that Bitmain is not a highly ethical company.  Anyone paying attention to their product releases is not going to be surprised to learn that Bitmain is lying about the power usage to make their miners appear far more efficient than they know they are.

It’s Sunday morning and what do I have planned for today?  Redoing invoices and having difficult conversations with customers.  With the Bitcoin mining ROI in the gutter, this is the last thing miners want to hear.


Dog lover, chess player, aspiring stand up comedian.

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