Solo Satoshi introduced the Bitaxe Naja Duo 1201 in August 2026, bringing two BM1373 ASICs into an open-source desktop Bitcoin miner. Its product specifications list approximately 4.4 TH/s at 42 watts in the default operating profile—equivalent to 9.5 J/TH based on the vendor’s numbers. That is an important silicon-generation step, but the figure is not the same as independently measured electricity at the AC outlet.

Key Takeaways

• Two Bitmain BM1373 ASICs drive a stock 4.4 TH/s target; Solo Satoshi calls the chips S23-class 3 nm silicon.
• The seller advertises 42 W and 9.5 J/TH by its stated measurement boundary—not a verified wall-power result.
• Previous independent testing discussed by BitcoinVersus.Tech found about 60 W at the outlet for 4.6 TH/s, or 13.0 J/TH.
• The tested 8 TH/s overclock costs about 92 W in vendor-reported power and lowers stated efficiency to 11.5 J/TH.

Two BM1373 ASICs in a Desktop Miner

The Naja Duo pairs a Thermalright AXP90-X47 cooler and 92 mm PWM fan with individual chip-temperature sensing, a two-phase voltage regulator, ESP32-S3 control, Wi-Fi, a 1.9-inch color display and ESP-Miner/AxeOS firmware. The retail listing currently displays a $389.99–$409.99 price range depending on configuration. Its 12 V input and XT30 connector distinguish the design from older single-chip Bitaxe models. For context, our Gamma 603 coverage concerns a different, single-BM1370 model.

Solo Satoshi’s August 28 launch announcement lists the two-chip Naja Duo’s default and overclock settings.

Solo Satoshi’s Naja Duo hardware walkthrough and testing video includes the stock and overclocked operating profiles.

Why 9.5 J/TH Is Not a Wall-Power Benchmark

At the seller’s stated 327 MHz and 1,000 mV default settings, 42 W ÷ 4.4 TH/s is approximately 9.55 J/TH. At a tested 600 MHz and 1,120 mV, the seller quotes 8 TH/s and 92 W—roughly 11.5 J/TH. Both are vendor-reported values and the seller discloses ±15% variation. Power-supply losses and auxiliary consumption change the result at the wall.

Our September 30 Naja Duo wall-test report reviewed independent data near 4.6 TH/s at 60 W, producing approximately 13.0 J/TH measured from the outlet. That is a different testing boundary, not a contradiction to a chip- or board-level rating. For a deeper comparison, read our nameplate-versus-wall efficiency explainer.

Fully Electric’s wall-power demonstration provides an important independent counterpoint to the launch specification.

Community launch discussion from August 25 includes the announced specifications and early owner questions.

What Comes Next

The Naja Duo illustrates how newer ASIC generations can bring more SHA-256 hashrate into a home-sized form factor. It does not prove a new network-wide efficiency rate or establish a date for the theoretical 1 J/TH milestone. Compare sustained hashrate, valid shares, temperatures, firmware version and measured wall power before incorporating any device into a broader power-efficiency trend. Related reading: earlier open-source Bitaxe performance experiments and Bitaxe Stratum V2 support.

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