Bitaxe Comparison 2026: Supra vs Ultra vs Gamma vs GT vs Hex — Which One?

The Bitaxe family has grown from a single open-source ASIC board into a full lineup of solo mining devices spanning five distinct models, three different Bitmain chips, and hashrates from 500 GH/s to over 3 TH/s. If you have been following the open-source mining movement, you know the names: Supra, Ultra, Gamma, GT, Hex. But the specs, chip differences, power requirements, and overclocking ceilings vary significantly between them — and choosing the wrong model means either leaving performance on the table or overspending for features you do not need.

This is a pure specification comparison. Every number in this article comes from D-Central’s hands-on testing of production units. We have been part of the Bitaxe ecosystem since its earliest days — we manufactured the original Bitaxe Mesh Stand, developed custom heatsinks for both the standard Bitaxe and the Hex, and our ASIC repair technicians test every unit before it ships from our facility in Laval, Quebec. We do not just sell these devices. We helped build the ecosystem around them.

If you are looking for a more advisory, “which one should I buy” approach, see our Bitaxe Buying Guide. This article goes deeper on the technical specifications, chip architecture, power delivery, thermal characteristics, and overclocking data that serious miners need to make an informed decision.

The Open-Source ASIC Revolution — How We Got Five Bitaxe Models

The original Bitaxe was designed by Skot and released under the MIT License — the first fully open-source Bitcoin ASIC miner in history. The idea was radical: take the same Bitmain ASIC chips found inside industrial miners costing thousands of dollars, mount them on a compact PCB with WiFi and an OLED display, and put real SHA-256 hashing power on the desks of individual Bitcoiners. No data center required. No permission needed.

The ecosystem evolved through a series of hardware revisions, each identified by a generation number:

• 100 series (Bitaxe Max) — The original design using the BM1397 chip from the Antminer S17 era. Discontinued.
• 200 series (Bitaxe Ultra) — Upgraded to the BM1366 from the Antminer S19 XP. The first Bitaxe to deliver 400-500 GH/s. Still in circulation but largely superseded by the Supra.
• 400 series (Bitaxe Supra) — Moved to the BM1368 from the Antminer S21 family. Better efficiency than the Ultra at similar hashrate. Currently D-Central’s entry-level Bitaxe offering.
• 600 series (Bitaxe Gamma) — The generational leap. Uses the BM1370 from the Antminer S21 Pro — a 3nm chip that roughly doubles the hashrate per watt compared to the BM1366. This is where the Bitaxe went from curiosity to serious solo mining tool.
• 800 series (Bitaxe GT / Gamma Turbo) — Two BM1370 chips on a single 6-layer PCB. Designed by Skot himself, the GT doubles the Gamma’s hashrate in nearly the same footprint. The most powerful single-board Bitaxe ever built.

The Bitaxe Hex sits outside the numbered series as a multi-chip platform — six BM1366 chips on one board, brute-forcing its way to the highest total hashrate in the lineup at 3+ TH/s.

D-Central Technologies has been a pioneer throughout this evolution. We stock every variant, manufacture accessories for every form factor, and our ASIC repair team has hands-on experience with every chip in the lineup. That depth of hardware knowledge is what makes this comparison different from spec sheets you will find elsewhere.

Understanding the ASIC Chips — BM1366 vs BM1368 vs BM1370

Every Bitaxe model is defined by its ASIC chip. The chip determines the hashrate ceiling, power efficiency, thermal characteristics, and overclocking headroom. Three Bitmain chips are currently used across the Bitaxe lineup:

BM1366 — The Proven Workhorse (5nm)

The BM1366 is Bitmain’s 5nm chip from the Antminer S19 XP generation — one of the most battle-tested ASIC chips in Bitcoin mining history. In a single-chip Bitaxe Ultra configuration, it produces 400-500 GH/s at roughly 12W, yielding an efficiency of approximately 24 J/TH. The chip is well-understood, with predictable overclocking characteristics and a large community knowledge base.

The Bitaxe Hex uses six BM1366 chips to achieve its 3+ TH/s hashrate. While the individual chip efficiency is not as good as the newer BM1370, the Hex compensates with raw chip count — six lottery tickets running in parallel on a single board.

BM1368 — The Efficiency Refinement (5nm)

The BM1368 comes from the Antminer S21 family and represents an architectural refinement of the 5nm process. Used in the Bitaxe Supra (400 series), it delivers 625-775 GH/s at approximately 12W — better efficiency than the BM1366 at ~17 J/TH. The Supra’s higher hashrate at similar power draw makes it a clear upgrade over the Ultra for budget-conscious miners.

BM1370 — The 3nm Powerhouse

The BM1370 is the current flagship — a 3nm chip from the Antminer S21 Pro that delivers a generational leap in efficiency. In the Bitaxe Gamma, a single BM1370 produces 1.0-1.2 TH/s at approximately 15-21W, achieving roughly 15 J/TH. The jump from 5nm to 3nm is not incremental — it is transformative. The BM1370 produces more than double the hashrate of the BM1366 while consuming only marginally more power.

The BM1370 also has the most overclocking headroom. D-Central’s Modern Minibit Gamma pushes a single BM1370 to sustained 1.8+ TH/s (peaks above 2 TH/s) using proprietary thermal management — nearly doubling the stock hashrate from the same chip. That kind of overhead simply does not exist on the older 5nm silicon.

Complete Specification Comparison — Every Bitaxe Side by Side

This is the table you came here for. Every current Bitaxe variant with every specification that matters for a purchasing decision. Data sourced from D-Central’s testing of production units.

Monthly electricity costs calculated at $0.12 CAD/kWh running 24/7 at stock settings.

Critical note on USB-C: Every Bitaxe model has a USB-C port, but it is for firmware flashing and serial communication only. You cannot power a Bitaxe through USB-C. The Supra, Ultra, and Gamma require a 5V 6A barrel jack PSU. The GT and Hex require a 12V XT30 power supply. Using the wrong power supply will damage your device.

Efficiency Showdown — Joules per Terahash Ranked

Efficiency — measured in joules per terahash (J/TH) — tells you how much energy your Bitaxe needs to produce each terahash of mining power. Lower is better. This metric matters because your Bitaxe runs 24/7, and electricity costs are the only ongoing expense of solo mining.

Here is how the five models rank, from most efficient to least:

The Gamma leads by a wide margin. Its single BM1370 chip operates at its optimal voltage and frequency sweet spot, delivering the best watts-to-hashrate ratio in the entire Bitaxe family. The GT, despite using the same chip, adds a small efficiency penalty from the dual-chip board design, voltage regulation overhead, and 12V-to-core conversion. The difference is minor — 15 vs 18 J/TH — but it exists.

The Hex finishes last on efficiency because it is fighting a different battle. Six BM1366 chips at 5nm simply cannot match the per-watt performance of a single 3nm BM1370. But efficiency is not everything. The Hex has a different value proposition: total hashrate. At 3+ TH/s, it puts six times the lottery tickets into the block reward drawing compared to a single-chip Supra.

The takeaway: if you are optimizing for lowest electricity cost per hash, the Gamma wins. If you are optimizing for maximum probability of finding a block, the Hex wins. These are fundamentally different strategies, and neither is wrong.

Hashrate Comparison — Who Leads the Pack

For solo miners, hashrate is the most visceral metric. More hashes per second means more attempts to solve a block, which means better odds of hitting the 3.125 BTC jackpot. Here is how the lineup stacks up at both stock and overclocked settings:

The Gamma stands out for having the highest overclocking headroom as a percentage. The BM1370’s 3nm architecture gives it significant thermal and voltage margin to push well beyond stock speeds — D-Central’s Modern Minibit Gamma ships pre-overclocked to sustained 1.8+ TH/s with proprietary thermal management. That nearly doubles the stock hashrate from a single chip.

The GT’s overclocking gain is more modest in percentage terms because it already runs two chips near their optimal point. But in absolute numbers, a fully overclocked GT at 2.55 TH/s approaches the Hex’s stock hashrate at a fraction of the power consumption.

For detailed overclocking settings, frequency values, voltage configurations, and thermal management for each model, see our dedicated Bitaxe Overclocking Guide.

Solo Mining Odds — What Each Bitaxe Gives You

Solo mining is a probability game. Your Bitaxe competes against the entire Bitcoin network — currently over 800 EH/s of combined hashpower. The math is straightforward: your odds of finding a block in any given period equal your hashrate divided by the total network hashrate, multiplied by the number of blocks produced in that period.

Here are the approximate solo mining statistics for each model at stock settings, assuming a network hashrate of 800 EH/s and 144 blocks per day:

These numbers look daunting — and they should. Solo mining with a Bitaxe is a lottery, not an investment strategy. But here is what the raw statistics miss: thousands of Bitaxe devices are running right now, and multiple Bitaxe miners have already found solo blocks, with combined payouts exceeding $1 million USD. Every single one of those winners faced the same “impossible” odds.

The philosophical framing matters as much as the math. Solo mining with a Bitaxe is not about expected ROI. It is about contributing to Bitcoin’s hash rate decentralization while holding a non-zero chance at a full 3.125 BTC block reward. It costs less per month to run than most streaming subscriptions. The upside is asymmetric. That is why Bitcoiners run these devices.

For a deeper exploration of the solo mining philosophy, see our article Every Hash Counts: The Philosophy Behind Solo Mining.

Power Supply Requirements — Getting It Right

The power supply is the most critical accessory for any Bitaxe, and it is also the most common source of confusion. Different models use different voltages and connectors. Using the wrong PSU will damage your device. Here is exactly what each model needs:

5V Barrel Jack Models: Ultra, Supra, Gamma

All single-chip models with 5V power input use a standard 5.5mm x 2.1mm DC barrel jack connector. The required power supply is 5V at 6A (30W). This is not a standard phone charger — most USB adapters output 5V at 2-3A, which is insufficient and will cause instability or failure to boot.

D-Central’s 5V 6A Bitaxe Power Supply ($29.99 CAD) is specifically designed for these models with the correct connector, voltage, and amperage. It provides clean, stable 5V power with enough headroom for overclocking.

Why 6A when the Gamma only draws ~21W (4.2A)? Headroom. Overclocking increases power draw, and a PSU running near its maximum rating generates more heat, introduces more voltage ripple, and degrades faster. A 30W PSU running a 21W load stays cool, stable, and lasts longer.

12V XT30 Models: GT, Hex

The multi-chip models (GT with 2 chips, Hex with 6 chips) step up to 12V DC with an XT30 connector. The XT30 is a compact, high-current connector borrowed from the RC and power electronics world — it is rated for 30A continuous and provides a secure, vibration-resistant connection.

• Bitaxe GT: Requires a 12V PSU capable of at least 10A (120W+). The GT draws 35-43W at stock, but you need headroom for overclocking and inrush current.
• Bitaxe Hex: Requires a 12V PSU capable of at least 10A (120W+). The Hex draws approximately 90W at stock settings.

If your PSU does not have a native XT30 connector, D-Central offers an XT30 Female to DC Power Cable that adapts a standard 5.5mm barrel jack PSU to the XT30 connector used on the GT and Hex.

The USB-C Confusion

Every Bitaxe has a USB-C port. It is not for power delivery. The USB-C port is used exclusively for firmware flashing via the serial interface and for initial setup if WiFi configuration fails. Attempting to power a Bitaxe through USB-C will not work — the board does not have the circuitry to accept power through that port. This is the single most common mistake new Bitaxe owners make.

Accessories Ecosystem — What Works With What

D-Central has developed the most comprehensive Bitaxe accessory ecosystem available. Here is a compatibility matrix for every major accessory category:

Heatsinks

Cases and Enclosures

Stands

Cooling Sockets (Tower Cooler Upgrades)

For a complete breakdown of every accessory with detailed descriptions and setup recommendations, see our Complete Bitaxe Accessories Guide.

Overclocking Potential — Stock vs Tuned Performance

Every Bitaxe ships with conservative stock settings to ensure stability out of the box. The real performance lies in overclocking — pushing frequency and voltage through the AxeOS web interface to extract maximum hashrate from each chip. Overclocking is free. It costs nothing but a few extra watts on your power bill and some time spent tuning.

The Gamma has the most dramatic overclocking story. The BM1370’s 3nm architecture gives it nearly double the frequency headroom of the 5nm chips — from 525 MHz stock to 1000 MHz maximum tested. That is why D-Central’s Modern Minibit Gamma can sustain 1.8+ TH/s: it uses proprietary thermal management (dual heatsinks, 60mm fan, engineered airflow duct) to keep the chip and voltage regulator cool at frequencies that would throttle a stock unit.

The GT’s per-chip overclocking headroom is more conservative because it runs two chips sharing a power delivery system. Pushing both chips to maximum simultaneously creates thermal challenges that a single-chip board does not face. Nevertheless, 2.4-2.55 TH/s from a device the size of a credit card holder is remarkable engineering.

Silicon lottery applies to every unit. ASIC chips are subject to manufacturing variations. Your specific chip may overclock better or worse than the numbers above. These are community-tested averages, not guarantees. Always tune for your individual unit and monitor temperatures.

For step-by-step overclocking instructions, safe voltage limits, and frequency tuning methodology for each model, read our comprehensive Bitaxe Overclocking Guide.

Which Bitaxe Should You Buy — The Decision Matrix

After 25+ specifications, charts, and tables, here is the distilled recommendation based on what matters most to you:

The sweet spot for most buyers is the Gamma at $229.99. It delivers the best efficiency in the lineup, the highest overclocking headroom, and more than double the hashrate of the Supra for only $40 more. If you want to spend once and get the best possible performance from a single-chip Bitaxe, the Gamma is the answer.

If budget is the primary constraint, the Supra at $189.99 gets you into solo mining for under $200 with a chip that is genuinely more efficient than the older Ultra. If budget is not the constraint and you want maximum odds, the Hex at $499.99 puts six chips on one board and runs at 3+ TH/s.

The GT occupies a unique position for miners who want top-tier hashrate in the smallest possible footprint. At 2+ TH/s from a 120x60mm board, it is the densest Bitaxe design ever built — and with the Noctua fan, it is also the quietest multi-TH/s miner in existence.

Frequently Asked Questions

Every Hash Counts — And D-Central Has Every Bitaxe

The Bitaxe lineup in 2026 offers a clear model for every type of solo miner. The Supra gets you started for under $200. The Gamma delivers the best efficiency and overclocking potential at $229.99. The GT packs 2+ TH/s into the smallest footprint in the family. And the Hex puts 3+ TH/s of hashing power on your desk for under $500.

Every model runs AxeOS, connects via WiFi, displays real-time stats on an OLED screen, and supports any Stratum-compatible mining pool. Every model is 100% open-source under the MIT License. And every model is available from D-Central Technologies — the Canadian Bitcoin mining company that has been part of the Bitaxe ecosystem since its earliest days.

We created the original Bitaxe Mesh Stand. We developed custom heatsinks for the Bitaxe and Hex. Our ASIC repair technicians test every unit before it ships. And we stock every variant, every accessory, and every power supply the Bitaxe ecosystem has produced. When you buy from D-Central, you are buying from builders who live and breathe open-source Bitcoin mining.

Every hash counts. Choose your Bitaxe and start hashing.

Explore the complete Bitaxe ecosystem at D-Central’s Bitaxe Hub