Bitaxe Ultra 204
The board that started the modern Bitaxe wave, using the Antminer S19j Pro's BM1366. Historically important and still perfectly functional, but three generations behind on efficiency.
Typical street price, excluding shipping and duties.
No longer sold new — check second-hand listings.
Specs verified 5 Aug 2026. Source
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 Ultra 204 is expected to find a block roughly once every 34.36K 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 $0.4945 a month, against $1.49 of electricity. At your electricity rate that loses money — every 25 sats mined costs $0.0490 in power. Buying the same BTC on an exchange would be cheaper.
Full specifications
- ASIC chip
- 1× BM1366
- Stock hashrate
- 500 GH/s
- Tuned hashrate
- 650 GH/s
- Stock power
- 12 W
- Tuned power
- 18 W
- Efficiency
- 24.0 J/TH
- Tuned efficiency
- 27.7 J/TH
- Power input
- 5.5mm barrel, 5V 5A
- PSU included
- No
- Connectivity
- Wi-Fi 2.4GHz
- Display
- 0.91in OLED
- Noise
- ~33 dB
- Dimensions
- 95 × 85 × 45 mm
- Weight
- 0.2 kg
- Form factor
- desktop
- Firmware
- AxeOS
- Open source
- Yes
- Solo mining
- Yes
- Pool mining
- Yes
- Built-in full node
- No
- Released
- 2023
The verdict
Best for: Collectors and people learning to solder.
Strengths
- Very cheap used
- Lowest absolute power draw of the ASIC boards here
- Enormous amount of documentation
Trade-offs
- 24 J/TH — poor by current standards
- Less than half the hashrate of a similarly-sized Gamma
- Discontinued
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 →