The Whatsminer M7DS bets everything on density

680 TH/s from a single air-cooled box — more than double an S21 XP — at 13.53 J/TH. MicroBT is not chasing the efficiency crown this generation. It is chasing the cost of everything that is not electricity.

MicroBT Whatsminer M7DS (680 TH/s)

A different bet from Bitmain’s

At 13.53 J/TH the M7DS is not the most efficient machine announced this cycle — Bitmain’s S23 is at 11 and Bitdeer’s A4 Pro at 10.9. What it has instead is 680 TH/s in one air-cooled box, which is more than double an S21 XP and about two and a half times an S21 Pro.

Every fixed cost of owning a machine is per box, not per terahash. Freight, import duty, customs brokerage, rack space, the setup labour, the PDU port — identical whether the unit does 270 TH/s or 680. Doubling the hashrate inside one chassis halves all of it per terahash, and on an imported machine at a site with duty that is not a rounding error.

At our Argentina site the M7DS works out at about $42,600 of electricity per bitcoin and roughly 45% in its first year, which is ahead of every air-cooled machine we currently host despite a worse J/TH than two of them.

Freight, duty, customs, rack space and setup cost the same for 680 TH/s as for 270. That is the whole strategy.

What MicroBT’s last two generations tell us

The M60 generation is a useful and slightly painful reference. It arrived at 19.9 J/TH six weeks after the 2024 halving and had the hardest start of anything we bought — and it still covers its hardware by the 2028 halving, helped by a move to cheaper power.

The M61 that followed tightened efficiency without changing the shape of the machine. The M7DS is the first time MicroBT has made density the headline rather than a consequence, and it is a more interesting bet than another half-point of J/TH would have been.

What we have not seen from them is a machine this large in air. 680 TH/s in one chassis is a serious thermal problem, and the honest unknown is how it behaves in a hot room rather than on a bench. Our Argentina site runs above 99% uptime and will answer that question quickly.

Where it fits

If you are paying import duty and filling limited rack space, density is worth more than the spec sheet suggests, and the M7DS is the strongest expression of that available. On the forward figures it has about 0.187 BTC in it before April 2028 — the largest of any air-cooled machine we track.

If your constraint is purely the power bill, the S23 and the A4 Pro Air both make a cheaper coin. The right question is which of your costs is actually binding: for most operators with an imported fleet it is not the one they assume.

Bitmain Antminer S23 (318 TH/s) — 11 J/TH, Pre-order, $34,617 of electricity per bitcoin, 32% year one
Bitdeer SealMiner A4 Pro Air (336 TH/s) — 10.9 J/TH, To be released, $34,298 of electricity per bitcoin, 50% year one
Bitmain Antminer S23 Hyd (563 TH/s) — 9.5 J/TH, In stock, $31,017 of electricity per bitcoin, 28% year one

The machines that make cheaper bitcoin, at lower density.

Which machines this covers

Disclosure

Firsthand Bitcoin sells and hosts mining hardware, including this machine. No manufacturer, distributor or affiliate programme paid for or reviewed this page and we take no commission on the links above. Historical figures are computed from daily bitcoin price and network hashprice, each day valued at its own prices. Nothing here is investment advice.