Bitaxe Duo 650
Two BM1370 chips on one board for a modest premium over the single-chip Gamma: about 36% more hashrate at the same 15-16 J/TH efficiency. Whether it wins on price-per-terahash depends on the day — Bitaxe pricing moves constantly, so check the per-TH column rather than assuming.
What it costs, what it might win
Running costs across the site use this rate. The default is a typical household tariff — check your own bill for the real number.
The odds, honestly
At the current network difficulty of 1.262e+14, a Bitaxe Duo 650 is expected to find a block roughly once every 10.54K years. That is an average across infinite attempts, not a countdown — a block could come tomorrow, or never.
If you pooled instead
Point the same device at a normal mining pool and you would receive the statistical average steadily instead of gambling on it: about $1.61 a month, against $3.23 of electricity. At your electricity rate that loses money — every 82 sats mined costs $0.1061 in power. Buying the same BTC on an exchange would be cheaper.
Full specifications
- ASIC chip
- 2× BM1370
- Stock hashrate
- 1.63 TH/s
- Tuned hashrate
- 2.20 TH/s
- Stock power
- 26 W
- Tuned power
- 42 W
- Efficiency
- 16.0 J/TH
- Tuned efficiency
- 19.1 J/TH
- Power input
- USB-C PD
- PSU included
- No
- Connectivity
- Wi-Fi 2.4GHz
- Display
- 0.91in OLED
- Noise
- ~38 dB
- Dimensions
- 110 × 95 × 45 mm
- Weight
- 0.3 kg
- Form factor
- desktop
- Firmware
- AxeOS
- Open source
- Yes
- Solo mining
- Yes
- Pool mining
- Yes
- Built-in full node
- No
- Released
- 2025
The verdict
Best for: Buyers who want more hashrate in one box without losing efficiency.
Strengths
- Two chips at close to single-chip pricing
- Same efficiency as single-chip Gamma despite double the silicon
- Still runs from a USB-C PD charger
Trade-offs
- Newer design with a smaller tuning knowledge base
- Two chips means more heat in the same footprint
- Availability is builder-dependent
About Bitaxe
The reference open-source solo miner, designed by Skot and maintained by Open Source Miners United. Bitaxe is a hardware design rather than a company: many vendors build and sell boards from the same public schematics, so quality and price vary by builder.
bitaxe.org →