Bitaxe Gamma v601 Open Source Bitcoin Miner - Bithalo Black Edition 
GekkoScience Compac A2 – BM1370 Bitcoin USB-Stick Miner up to 1 TH/s
The GekkoScience Compac A2 is the most powerful and most efficient generation of GekkoScience USB stick miners and the first USB miner ever to deliver 1 TH/s from a single USB port. Inside is a single Bitmain BM1370 ASIC in 7 nm process – the same chip used in the popular Bitaxe Gamma. The Compac A2 thus raises USB stick mining to an efficiency level previously only achievable with pod miners.
Hashrate scales almost linearly with clock rate (rule of thumb: ~2 GH/s per MHz). At its factory baseline of 400 MHz and 270 mV, the A2 delivers a stable 800 GH/s at around 13–14 W. Optimized for efficiency, it runs at ~300 MHz and 250 mV producing 600 GH/s at just 10 W – the ideal configuration for quiet, low-power 24/7 solo mining. Pushed to the limit at 500 MHz, 300 mV, it reaches the full 1 TH/s (1000 GH/s) at roughly 16–17 W.
All operating parameters (clock rate, core voltage, fan speed) are software-controlled via the Java API integrated into CGMiner. A real-time telemetry stream exposes voltage, ASIC and PCB temperature, and current fan speed – ideal for custom dashboards and temperature-controlled deployments. The included Icepac fan is PWM-controlled and can be addressed directly through the API, making the Compac A2 one of the quietest USB miners on the market.
Key benefits at a glance
- Up to 1 TH/s from a single USB port – a first in the USB stick miner segment.
- Bitmain BM1370 ASIC (7 nm) – the same chip used in the Bitaxe Gamma.
- Efficiency ≈ 16–17 W/TH – nearly twice as efficient as the Compac A1 (~30 W/TH).
- Low-power mode: 600 GH/s at just 10 W – perfect for quiet 24/7 solo mining.
- Factory setting: 800 GH/s @ 400 MHz / 270 mV (~13–14 W) – safe and stable out of the box.
- Overclock to 1 TH/s at 500 MHz / 270 mV → ~16–17 W.
- Scaling rule: hashrate (GH/s) ≈ 2 × clock rate (MHz) – simple capacity planning.
- Icepac fan with PWM control, directly addressable from the CGMiner Java API.
- Live telemetry: voltage, ASIC temperature, PCB temperature, fan speed, hashrate – all readable and adjustable via API.
- Cross-platform: Windows (32/64-bit), Linux (x86 / ARM, including Raspberry Pi), macOS.
- Ships from Germany – fast EU delivery, English- and German-language support, illustrated setup guides.
Who is the Compac A2 for?
The Compac A2 is the first choice for ambitious solo lottery miners and Bitcoin enthusiasts who want maximum hashrate at minimum power draw from their desk. At 600 GH/s in low-power mode (10 W) it runs comfortably 24/7 next to a Bitcoin full node – nearly silent, barely noticeable on the power bill, and with a real shot at finding a solo block. If you know the BM1370 from the Bitaxe Gamma, the A2 gives you the same chip in a convenient USB stick form factor. For small home mining setups with multiple sticks on a smart hub, the A2 is the most economical option in the current USB miner segment thanks to its outstanding efficiency.
Technical specifications
| Hashrate (low-power mode) | ≈ 600 GH/s @ ~300 MHz / 250 mV / 10 W |
|---|---|
| Hashrate (factory setting) | ≈ 800 GH/s @ 400 MHz / 270 mV / 13–14 W |
| Hashrate (Overclock) | up to 1 TH/s (1000 GH/s) @ 500 MHz / 270 mV / 16–17 W |
| Scaling formula | hashrate (GH/s) ≈ 2 × clock rate (MHz) |
| ASIC chip | 1× Bitmain BM1370 (7 nm SHA-256) – same chip as the Bitaxe Gamma |
| Algorithm | SHA-256 / SHA256d (Bitcoin, Bitcoin Cash, etc.) |
| Efficiency | ≈ 16–17 W/TH (= 0.016–0.017 W/GH) |
| Power consumption | 10–17 W depending on operating point |
| Clock rate | software-adjustable (CGMiner console parameter or Java API) |
| Core voltage | software-adjustable – no soldering, no hardware tweaking |
| Telemetry / monitoring | voltage, ASIC temperature, PCB temperature, fan speed, hashrate, status – all live readable and adjustable via API; automatic safety shutdown on overheat |
| Fan | Icepac fan, PWM-controlled, directly addressable through the CGMiner Java API |
| Interface | USB 2.0 (powered USB hub with 5 V / 2–4 A recommended) |
| Operating systems | Windows (32/64-bit), Linux (x86 / ARM, Raspberry Pi), macOS |
| Mining software | Modified CGMiner build with Java API (by Kano) |
| Manufacturer | GekkoScience LLC, Shelbina, Missouri, USA |
Package contents
- 1× GekkoScience Compac A2 USB stick miner with BM1370 ASIC
- Icepac fan (PWM, pre-installed)
- Cardboard packaging
What else do I need?
- A host PC or Raspberry Pi running Windows, Linux or macOS.
- A powered USB hub with strong power delivery (5 V, 2–4 A per port). Recommended: GekkoScience 7-port USB hub or GekkoScience Smart Hub. At 1 TH/s the Compac A2 draws up to 17 W – an under-spec port can be damaged.
- A Bitcoin mining pool account (solo pool, public solo CKPool, Braiins, F2Pool, Ocean, etc.) and a Bitcoin wallet address for payouts.
Recommended operating points
| Target hashrate | Clock | Voltage | Power | Use case |
|---|---|---|---|---|
| 600 GH/s | ~300 MHz | 250 mV | 10 W | Quiet, low-power 24/7 operation |
| 800 GH/s | 400 MHz | 270 mV | 13–14 W | Factory baseline, safe and stable |
| 1 TH/s | 500 MHz | 300 mV | 16–17 W | Maximum hashrate for solo lottery mining |
Setup & instructions
Frequently Asked Questions (FAQ) about the GekkoScience Compac A2
Was ist der GekkoScience Compac A2?
The GekkoScience Compac A2 is the current top-of-the-line generation of Bitcoin USB stick miners – the first USB miner to reach 1 TH/s from a single USB port. Inside is a Bitmain BM1370 ASIC chip in 7 nm process (the same chip as in the Bitaxe Gamma). Clock rate, core voltage and fan speed are all software-adjustable via the Java API in CGMiner, and a live telemetry feed monitors every operating parameter.
How many GH/s does the Compac A2 deliver?
Depending on the configuration, the Compac A2 delivers between 600 GH/s and 1 TH/s. Rule of thumb: Hashrate (GH/s) ≈ 2 × frequency (MHz). Typical operating points are 600 GH/s at 10 W (low-power mode), 800 GH/s at 13–14 W (factory setting) and 1000 GH/s at 16–17 W (overclocked to 500 MHz, 300 mV).
Welcher Chip ist im Compac A2 verbaut?
The Compac A2 uses a single Bitmain BM1370 ASIC in 7 nm process – the exact same chip used in the popular open-source Bitcoin miner Bitaxe Gamma. If you know the BM1370 from the Bitaxe Gamma, the A2 delivers the same performance in a convenient USB stick form factor.
How much power does it consume?
The Compac A2 achieves around 16–17 W/TH efficiency, making it nearly twice as efficient as the Compac A1 (~30 W/TH). In low-power mode it produces 600 GH/s at just 10 W – among the best efficiency figures in today’s USB miner segment.
How efficient is the Compac A2?
The Compac A2 achieves an efficiency of approximately 16–17 W/TH, making it almost twice as efficient as the Compac A1 (~30 W/TH). In low-power mode, it delivers 600 GH/s at only 10 W – one of the best values in the current USB miner segment.
Can you earn Bitcoin with the Compac A2?
In classic pool mining, even a 1 TH/s stick produces modest earnings that, at European electricity prices, are generally below the cost of power. The Compac A2 is therefore mainly used for solo (“lottery”) mining, for learning, and for home setups with multiple sticks. A successful solo block still pays out the full block reward.
What software do I need for the Compac A2?
The Compac A2 runs on a GekkoScience-specific modified version of the CGMiner mining software (build by Kano; version v4.13.5 supports the Compac A2). Clock rate, core voltage, fan speed and all telemetry values are controlled and queried via the integrated Java API – no soldering, no hardware tweaking.
What monitoring and telemetry features does the Compac A2 offer?
The Compac A2 provides complete real-time monitoring via Java API: Voltage, ASIC temperature, PCB temperature, fan speed, and hashrate can be read and controlled in real time. An automatic safety shutdown occurs in case of critical overheating. The Icepac fan speed can be controlled directly from the API via PWM – ideal for quiet setups and dashboards.
Does the Compac A2 work with a Raspberry Pi?
Yes. The Compac A2 runs under Linux x86 as well as Linux ARM, and therefore also on the Raspberry Pi. Important: At 1 TH/s, the A2 draws up to 17 W – this significantly exceeds the power handling capacity of a Raspberry Pi USB port (even the Pi 5 has a maximum of 8 W per port with a 27 W power supply). Therefore, an active USB hub with its own power supply is strongly recommended.
Do I need a powered USB hub?
Yes, definitely. At full performance (1 TH/s) the Compac A2 draws up to 17 W – more than any regular USB port can safely deliver, with risk of damaging the port. A powered USB hub with 5 V and 2–4 A per port is recommended, e.g. the GekkoScience 7-port USB hub or the GekkoScience Smart Hub.
Wie funktioniert die Lüfter-Versorgung beim Compac A2?
The Compac A2 ships with a pre-installed Icepac fan powered directly from the miner. The fan speed is PWM-controlled and can be addressed live through the Java API in CGMiner – enabling extremely quiet setups (low RPM at moderate hashrate) just as easily as maximum cooling in 1 TH/s overclocked operation.
Which cryptocurrencies can I mine with the Compac A2?
All cryptocurrencies based on the SHA-256 algorithm (SHA256d) – first and foremost Bitcoin (BTC), plus Bitcoin Cash (BCH) and other SHA-256 forks.
How is the Compac A2 different from the Compac A1?
The Compac A2 is the successor to the Compac A1 and brings three major leaps: higher hashrate (up to 1 TH/s vs 350–500 GH/s), significantly better efficiency (~16–17 W/TH vs ~30 W/TH), and a modern single-ASIC layout with the BM1370 chip (vs two BM1362 chips). The telemetry features match the Compac A1, extended with PWM-controlled fan management through the Java API.
Where does the Compac A1 ship from?
bitshopper.de ships the Compac A1 from Germany. There are no additional customs charges within the EU; outside the EU, import duties and taxes may apply.
Is there English-speaking support?
Yes. bitshopper offers German-language customer service via email (info@bitshopper.de) and telephone, as well as illustrated setup instructions for Windows, Linux/Raspberry Pi and macOS.
Alex Dutriaux (verified owner)
This shop is a very good shop, and Ernst is very nice and gives full answers to all the questions you may have about this product.
I were having a small rig with various usb miner, like antminer or block erupter. Those usb miner were small but enough for a solo mining 10 years ago. Today, those are really under efficient. So I was looking for a good usb miner to add to my rig, and found the Compac A2, by Gekkoscience.
In Europe, bitshopper is selling Gekkoscience product.
So I’ve ordered a Compac A2.
The shipping was a bit complicated, due to the transporter, but the product finally arrived.
It’s necessary to run it under cgminer, since there is no other mining software that still evolve, and that integrate the correct driver for the Compac A2, which is based upon a BM1370.
And, on Raspberry PI, you need to have your raspian in the Debian Trixie, since there are some issue with GCC under raspian Bookworm.
So after having face all those issues, I’ve started to mine some bitcoin shares…
At 300 MHz, it’s about 600 GH that is generated.
Since I have, few years ago, tweak some processor with overclocking, and since this Compac A2 is ready to be a bit overclocked, I’ve started to tweak it.
Quickly, I’ve found that my A2 is able to run at 400 MHz, under 275 mV for the core, and is quite stable at 41 / 42 °C even during this hot period.
Many Thanks Ernst for your support.