Bitaxe Models Compared: Max, Ultra, Supra, Gamma 601 and 602
Short answer: Every single-chip Bitaxe is built around one Bitmain ASIC from a particular Antminer generation: the Max uses the BM1397, the Ultra the BM1366, the Supra the BM1368 and the Gamma the BM1370. The three-digit number is the board version. The 600 series is the Gamma, and the Gamma 601 and 602 are hardware revisions of the same single-chip BM1370 design with identical factory firmware settings, not different performance tiers. Bitminers sells the Bitaxe Gamma 601 only.
Our Bitaxe explained guide covers what a Bitaxe does and its solo odds, and NerdMiner vs NerdQaxe vs Bitaxe compares it with other small miners. This page maps the Bitaxe family itself, using only what the project publishes: its hardware repositories on GitHub, the OSMU wiki and the device list in the official Bitaxe web flasher.
On this page
How Bitaxe model numbers work
The OSMU wiki names each design by its number series: Bitaxe 100 “Max”, 200 “Ultra”, 300 “Hex”, 400 “Supra”, 600 “Gamma”, 650 “Gamma Duo” and 801 “Gamma Turbo”. Within a series, the exact number identifies a board revision. The ESP-Miner firmware has configuration files for Ultra boards 201 to 207, Supra boards 400 to 403 and Gamma boards 601 to 603, and its factory images are built for each board version. That is why the number on your board matters when you flash firmware, as our Bitaxe setup and AxeOS guide explains.
Single-chip Bitaxe models compared
| Model | Series | ASIC | Chip comes from | Performance documented by the project | Power input |
|---|---|---|---|---|---|
| Max | 100 | BM1397 | Antminer S17 and T17 | 250 to 450 GH/s at up to 15 W | 5 V |
| Ultra | 200 | BM1366 | Antminer S19 XP and S19k Pro | 300 to 600 GH/s at up to 15 W | 5 V |
| Supra | 400 | BM1368 | Antminer S21 | No hashrate figure published | 5 V |
| Gamma | 600 | BM1370 | Antminer S21 Pro | About 1.2 TH/s | 5 V, more than 4 A |
Max and Ultra ranges come from the OSMU wiki; the Gamma figure comes from the bitaxeGamma repository. 1,000 GH/s equals 1 TH/s; our guide to hashrate and J/TH explains the units.
Bitaxe Max (BM1397)
The Max is the original design, described in its repository as the first fully open-source hardware Bitcoin ASIC miner. Its BM1397 is mostly used in the Antminer S17 and T17, and the project quotes Bitmain’s efficiency claim for that chip as 0.03 J/GH, or 30 J/TH. The web flasher lists one Max board version, 102.
Bitaxe Ultra (BM1366)
The repository calls the Ultra the third major revision. Its BM1366 is the chip used in the Antminer S19 XP and S19k Pro, with a Bitmain efficiency claim of 0.021 J/GH (21 J/TH) as cited by the project. Ultra boards 201 to 207 appear in the firmware and the web flasher.
Bitaxe Supra (BM1368)
The Supra is the fourth major revision and moves to the BM1368 from the Antminer S21, which Bitmain claims runs at 17.5 J/TH. Like the Ultra, it takes a 5 V supply the project says should handle over 15 W. The Supra repository and wiki page do not publish a hashrate figure, so we do not quote one here. The web flasher lists Supra boards 401, 402 and 403.
Bitaxe Gamma (BM1370)
The Gamma uses the BM1370 from the Antminer S21 Pro, for which Bitmain claims 15 J/TH. The repository explains its hashrate estimate: the S21 Pro has a nominal 234 TH/s across three hashboards of 65 chips each, 195 chips in total, and a Gamma carries one of them, so it delivers about 1.2 TH/s. The first Gamma, board 600, was based on the Supra 402 hardware with the new chip, a TPS546 voltage regulator, and the INA260 power meter and DS4432U+ current DAC removed. The project also warns that the Gamma uses more power and overheats more easily than earlier boards, especially with the stock heatsink and fan.
Bitaxe Gamma 601 vs 602 (and 603)
The bitaxeGamma repository publishes each revision as a release:
| Board | Released in the repository | What the release notes say |
|---|---|---|
| 600 | October 10, 2024 | First Gamma: Supra 402 hardware with the BM1370 and a TPS546 regulator |
| 601 | January 7, 2025 | Adds a 4-pin SMD JST fan connector for easier assembly; improved fan track routing |
| 602 | April 7, 2025 | “DFM and routing improvements” |
| 603 | February 17, 2026 | Published without detailed notes |
DFM stands for design for manufacturing: changes that make a board easier to produce. What stays the same between the 601 and 602 matters more for owners:
- Both use one BM1370 chip, and neither release note mentions a change in hashrate.
- ESP-Miner’s factory configuration is identical for both: 525 MHz frequency and 1,150 mV core voltage.
- The web flasher lists both under the Gamma model and offers a separate factory image for each.
So when comparing the Bitaxe Gamma 601 vs 602, treat the number as a manufacturing revision. The practical difference is firmware: flash the factory image that matches your board. At the time of writing, the web flasher lists Gamma boards 601 and 602; the 603 has a configuration file in ESP-Miner but is not among them.
The Gamma design files are published under CERN-OHL-S-2.0, an open hardware licence, so boards built to the design can come from different producers.
Multi-chip boards in the Bitaxe family
The project has also scaled the design up to several chips per board. These are the multi-chip devices listed in the official web flasher, with details from their repositories and the OSMU wiki:
| Model | Board version | ASICs | Notes from the project |
|---|---|---|---|
| Gamma Duo | 650 | 2 × BM1370 | Puts lower-performing chips from the S21 lineup to use |
| Gamma Turbo (GT) | 801 | 2 × BM1370 | First dual-chip design with current-generation ASICs; 12 V accessory port |
| UltraHex | 302, 303 | 6 × BM1366 | 12 V input; the wiki cites about 2.7 to 3 TH/s at roughly 60 W in development, and the repository marks it unfinished |
| SupraHex | 701, 702 | 6 × BM1368 | Listed in the web flasher |
| GammaHex | 1300 | 6 × BM1370 | 12 V input through a 6-pin Molex connector; 1.9-inch color LCD |
The bitaxeorg GitHub organization also hosts experimental designs built on chips from Auradine, Intel and Canaan. Separately, the NerdQaxe++ is another open-source design that runs four BM1370 chips; we list the NerdQaxe++ (4.8 TH/s) at $279.00 at the time of writing (October 4, 2026).
Why the chip generation matters
Each Bitaxe generation follows Bitmain’s chip roadmap. Using the efficiency claims the project cites, the step from BM1397 to BM1370 goes from 30 J/TH to 15 J/TH, half the energy for the same work. A newer chip also does more work per board: the single-chip Gamma is documented at about 1.2 TH/s, against 300 to 600 GH/s for the Ultra. Our guide to ASIC chips and hashboards explains how the same chips are packed by the hundred into full-size machines.
What Bitminers sells
We sell one Bitaxe model, the Bitaxe Gamma 601, new. Our listing shows 1.2 TH/s at 17 W (14.2 J/TH), air cooling and a listed noise level of 35 dB. Bitminers price at the time of writing (October 4, 2026): $77.17. We do not sell the Max, Ultra, Supra, Gamma 602 or the multi-chip Bitaxe boards. Browse all home and solo miners for other compact units, and read solo mining and lottery miners before you decide what to expect from 1.2 TH/s. A Bitaxe is a hobby and learning device; Bitminers does not guarantee mining profitability.
Frequently asked questions
What is the difference between the Bitaxe Gamma 601 and 602?
Both are single-chip BM1370 boards. The 601 release added a 4-pin SMD JST fan connector and improved fan routing, and the 602 release notes describe design-for-manufacturing and routing improvements. Their factory firmware settings are identical, but each has its own factory image.
Is the Bitaxe Gamma 602 faster than the 601?
The project’s release notes do not describe a hashrate difference. Both are Gamma boards, which the project documents at about 1.2 TH/s.
What chip does the Bitaxe Supra use?
The Supra uses the BM1368, the chip from the Antminer S21. Bitmain claims 17.5 J/TH for it; the project does not publish a Supra hashrate figure.
Which Bitaxe models does Bitminers sell?
Only the Bitaxe Gamma 601, 1.2 TH/s at 17 W according to our listing. We do not sell other Bitaxe boards.
Does a Gamma 601 use the same firmware as a 602?
Both run ESP-Miner, and the esp-miner.bin file used for AxeOS updates is the same for every board. For USB flashing, use the factory image built for your board number.