Review — Authorized MicroBT Dealer
Whatsminer M70S Review: 226–258 TH/s at Sub-14 J/TH (2026)
The Whatsminer M70S is MicroBT's mid-tier air-cooled miner in the M70 generation, offering 226–258 TH/s at ~13.5 J/TH — the best energy efficiency among the air-cooled M70 series models. Power draw is approximately 3,500 W.
We sell and host the Whatsminer M70S. This review is based on published MicroBT specifications and our operational experience. We do not fabricate ratings or profit projections.
Specs at a Glance
| Manufacturer | MicroBT |
|---|---|
| Model | Whatsminer M70S |
| Hashrate | 226–258 TH/s |
| Efficiency | ~13.5 J/TH (best in M70 air-cooled series) |
| Power Draw | ~3,500 W |
| Cooling | Air-cooled |
| Monthly electricity (at $0.07/kWh, 24/7) | ~$176 (3.5 kW × 720h × $0.07) |
| Price | Prices may vary — see current price |
Performance and Efficiency
At ~13.5 J/TH, the M70S is approximately 7% more efficient than the M70 (14.5 J/TH). Over a 12-month hold at $0.07/kWh, a 1 J/TH improvement on a 3,500W machine translates to approximately $158–$168 in electricity savings. The M70S delivers both higher hashrate (258 vs 242 TH/s peak) and lower electricity cost per TH.
For operations running large fleets over multi-year periods, the efficiency gap between M70 and M70S compounds significantly. Use our profitability calculator to model both hardware options with your expected holding period and BTC price scenarios.
Hosting Suitability
The M70S is air-cooled and compatible with our Southeast Texas facility's standard air-cooled racks. ~3,500W draw fits within standard ASIC power supply configurations. No special infrastructure beyond standard ASIC rack deployment is required.
Who Should Buy the M70S?
- →Efficiency-focused operators planning a long hold — the 13.5 J/TH advantage compounds over time
- →First-time miners who want the best long-term economics without moving to hydro cooling
- →Fleet operators where the per-machine efficiency gain multiplies across many units
M70S vs. M70 vs. M73: Comparison
| Factor | M70 | M70S | M73 |
|---|---|---|---|
| Hashrate | 214–242 TH/s | 226–258 TH/s | 470–526 TH/s |
| Efficiency | ~14.5 J/TH | ~13.5 J/TH (best) | 14.5 J/TH |
| Power | ~3,140–3,500 W | ~3,500 W | ~7,200 W |
| Cooling | Air | Air | Hydro |
Frequently Asked Questions
What is the Whatsminer M70S hashrate?
The Whatsminer M70S delivers 226–258 TH/s. The 258 TH/s figure represents its rated peak performance. This is approximately 7% more hashrate than the M70's 242 TH/s peak.
How efficient is the Whatsminer M70S?
The Whatsminer M70S is the most energy-efficient model in the air-cooled M70 series, at approximately 13.5 J/TH. This means it consumes less electricity per terahash than both the M70 and M73 (each at ~14.5 J/TH).
How does the Whatsminer M70S compare to the M70?
The M70S offers more hashrate (258 vs 242 TH/s peak) and better efficiency (13.5 vs 14.5 J/TH) than the M70, at a higher purchase price. Over a long holding period, the efficiency advantage reduces electricity costs: on a 3,500W machine at $0.07/kWh, a 1 J/TH improvement saves approximately $13–$14/month. Whether the M70S pays back its cost premium depends on hardware price, BTC price, and holding period.
Who should buy the Whatsminer M70S?
The M70S is best for efficiency-focused operators planning a long hold. Its ~13.5 J/TH efficiency delivers lower electricity costs over time compared to the M70. It's the recommended starting point for new miners who are comfortable with a slightly higher upfront cost in exchange for better long-term economics.
Buy or host a Whatsminer M70S
Authorized MicroBT dealer. Purchase the M70S and host it in Southeast Texas at $0.07/kWh all-in.