The Bitaxe Gamma Duo (series 650) is a dual-chip open-source solo miner that delivers about 1.63 TH/s from two BM1370 ASICs at roughly 26 W — an efficiency of about 16 J/TH. It slots neatly between the single-chip Bitaxe Gamma (~1.0–1.2 TH/s) and the dual-chip Gamma Turbo / GT (~2.15 TH/s), giving you more hashrate than a single Gamma while staying remarkably efficient and quiet.
Bitaxe Gamma Duo specifications
| Specification | Value |
|---|---|
| Series | 650 (Gamma Duo) |
| ASIC chip | 2× Bitmain BM1370 (Antminer S21 Pro-class 5nm silicon) |
| Hashrate | ~1.63 TH/s |
| Power draw | ~26 W |
| Efficiency | ~16 J/TH |
| Firmware | AxeOS / ESP-Miner (open source, ESP32-S3) |
| Mining modes | Solo or pool (Stratum V1) |
| Status | Active (2026) |
Where the Gamma Duo fits in the Bitaxe ladder
The Bitaxe Gamma generation is built around Bitmain’s BM1370 — the same 5nm chip class as the Antminer S21 Pro. The project ships it in three power tiers, and the Duo is the middle one:
| Model | Chips | Hashrate | Power | Efficiency |
|---|---|---|---|---|
| Gamma (601/602) | 1× BM1370 | ~1.0–1.3 TH/s | ~21 W | ~15 J/TH |
| Gamma Duo (650) | 2× BM1370 | ~1.63 TH/s | ~26 W | ~16 J/TH |
| Gamma Turbo / GT (801) | 2× BM1370 | ~2.15 TH/s | ~43 W | ~18 J/TH |
The interesting detail: the Gamma Duo and the GT use the same two BM1370 chips, but the Duo runs them at a gentler clock. That keeps power at ~26 W and efficiency near the single Gamma’s ~16 J/TH, while the GT pushes the same chips harder for ~2.15 TH/s at the cost of some efficiency (~18 J/TH). If your priority is sats-per-watt and low heat, a conservatively tuned dual-chip board is a sweet spot; if your priority is raw hashrate per device, the GT is the harder-charging sibling.
Buying a dual-chip Gamma board in Canada
D-Central does not currently stock the Gamma Duo (650) itself, but the same dual-BM1370 idea — and the single-chip Gamma it is based on — are both in stock and built here:
- Want maximum efficiency? The single-chip Bitaxe Gamma board from $184.99 CAD is the most efficient rung on the ladder (~15 J/TH), and the quietest.
- Want the dual-chip step up? The Bitaxe GT at $269.99 CAD runs the same two BM1370 chips as the Duo, tuned for more hashrate (~2.15 TH/s).
- Want even more boards in one box? The Bitaxe Hex ($389.99 CAD) and the NerdQaxe+ ($529.99 CAD) carry six and four chips respectively for multi-terahash desktop mining.
Buying open-source Bitaxe hardware in Canada
D-Central has been a Bitcoin mining repair bench since 2016. Every board we ship is hand-assembled, tuned and bench-tested in Laval, Quebec before it goes out the door. That is the difference between ordering from a domestic builder and importing a board across the border.
- Assembled & tested in Canada — the same technicians who run our ASIC repair bench build and quality-check your unit.
- Priced in CAD, no surprise FX — the number you see is the number you pay; no card-network currency conversion stacked on top.
- No customs, duties or brokerage — a board imported from a U.S. seller can pick up shipping, exchange spread, and cross-border brokerage before it reaches your door.
- In-house repair if something ever fails — if a board needs attention, it comes back to the people who built it, not a returns desk an international shipment away.
Shoulders of giants: the entire Bitaxe line exists because of skot and the open-source OSMU community, who published the first fully open Bitcoin ASIC miner. Vendors like Solo Satoshi have done excellent work bringing these designs to market at scale. D-Central’s contribution is a Canadian build-and-repair home for the same open hardware.
Frequently asked questions
Is the Bitaxe Gamma Duo the same as the Bitaxe GT?
They share the same two BM1370 chips, but they are tuned differently. The Gamma Duo runs ~1.63 TH/s at ~26 W (~16 J/TH); the GT pushes ~2.15 TH/s at ~43 W (~18 J/TH). The Duo favours efficiency, the GT favours hashrate.
How efficient is the Gamma Duo?
About 16 J/TH — nearly as efficient as a single Bitaxe Gamma (~15 J/TH), and better than the harder-clocked GT (~18 J/TH). For a dual-chip board, that is excellent sats-per-watt.
What firmware does it run?
The open-source AxeOS / ESP-Miner stack on an ESP32-S3, the same firmware family as every other Bitaxe. You get the web dashboard, solo or pool mining over Stratum V1, and OTA updates. See our Bitaxe Hub for setup guides.
Can I buy a Gamma Duo in Canada from D-Central?
Not at the moment — it is not in our current lineup. The closest in-stock options are the single-chip Bitaxe Gamma for efficiency and the dual-chip Bitaxe GT for more hashrate from the same BM1370 silicon. Use the Which Bitaxe picker to compare.
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