Bitaxe overclocking increases the core frequency and voltage of the ASIC chip beyond factory defaults through the AxeOS web interface. No additional software is required. At conservative to moderate levels, no hardware changes are needed either. The BM1370, BM1368, and BM1366 chips all support real-time adjustment natively. Higher frequency means more SHA-256 hash computations per second, which means more hashrate. A stock Bitaxe Gamma 602 runs at 525 MHz / 1150 mV and produces 1.07 TH/s. On our bench with a Dark Horse heatsink and Mean Well LRS-50-5, the same unit reaches 1.84 TH/s at 900 MHz / 1250 mV, a 72% increase. The additional power draw is approximately 17.4 watts, or $1.50/month at $0.12/kWh.
The overclocking ceiling for each unit depends on three factors: the ASIC chip generation (BM1370 has the most headroom), the quality of your cooling and power delivery, and the silicon lottery, the natural manufacturing variation that makes every chip slightly different.
This bitaxe overclocking guide covers every model ever made: the current lineup (Bitaxe Gamma 602, Bitaxe Duo 650, Bitaxe GT 801, Bitaxe Turbo Touch) plus the legacy models (Bitaxe Supra, Bitaxe Hex, Bitaxe Ultra) for owners of older hardware. Each profile includes frequency, voltage, temperature, power, and efficiency data at every overclock step.
Table of Contents
- Why Overclock Your Bitaxe?
- Bitaxe Model Reference
- How Overclocking Works: Frequency, Voltage, and Temperature
- Pre-Overclocking Checklist
- Step-by-Step Overclocking Process
- Bitaxe Gamma 602 (BM1370)
- Bitaxe Duo 650 (2x BM1370)
- Bitaxe GT 801 (2x BM1370)
- Bitaxe Turbo Touch (2x BM1370, Enclosed)
- Bitaxe Supra (BM1368)
- Bitaxe Ultra (BM1366) (Legacy)
- Bitaxe Hex (6x BM1366) (Legacy)
- All Models Compared: Stock vs Overclocked
- Cooling Solutions for Overclocking
- Advanced Techniques
- Monitoring Hashrate Errors During Overclocking
- Troubleshooting
- Overclocked Bitaxe Miners Have Won Real Blocks
- Related Guides
Why Overclock Your Bitaxe?
Every SHA-256 hash your Bitaxe computes is an independent attempt to find a valid nonce that satisfies the current network difficulty target. The ASIC chip processes these attempts in parallel across multiple computational cores, each executing a fixed number of hash rounds per clock cycle. When you increase the clock frequency, every core completes its rounds faster, producing more valid hash results per second.
At stock settings, the BM1370’s cores complete approximately 1.07 trillion operations per second (1.07 TH/s). At 900 MHz, those same cores complete approximately 1.84 trillion (1.84 TH/s). The silicon itself has not changed. You have simply increased the rate at which it executes instructions. The tradeoff is higher current draw through the transistor gates, which generates more heat and demands more from your power supply and cooling system.
This is why overclocking is the single most cost-effective performance upgrade available. Adding a second Bitaxe doubles your hashrate but also doubles your hardware cost, desk space, and power infrastructure. Overclocking extracts 30 to 90% more performance from hardware you already own, at the cost of a few extra watts and proper thermal management.
The practical payoff depends on how you mine. For solo miners, every additional gigahash directly improves your probability of finding a block. The potential reward is 3.125 BTC plus transaction fees. For pool miners, additional hashrate translates to proportionally higher daily payouts. Either way, overclocking converts a small increase in electricity cost into a measurable increase in mining output.
Bitaxe Model Reference
Every Bitaxe variant ever produced, with factory specifications:
| Model | ASIC Chip | Chips | Stock Hashrate | Stock Power | Efficiency | Power Input | Status |
|---|---|---|---|---|---|---|---|
| Bitaxe Gamma (600 Series) | BM1370 | 1 | 1.07 TH/s | 17.8 W | ~16.6 J/TH | 5V barrel jack | Current |
| Bitaxe Gamma Duo (600 Series) | BM1370 | 2 | 1.63 TH/s | 25.8 W | ~15.8 J/TH | 5V barrel jack | Current |
| Bitaxe GT (800 Series) | BM1370 | 2 | 2.15 TH/s | 43 W | ~20.0 J/TH | 12V XT30 | Current |
| Bitaxe Turbo Touch (800 Series) | BM1370 | 2 | 2.15 TH/s | 43 W | ~20.0 J/TH | 12V XT30 | Current |
| Bitaxe Supra (400 Series) | BM1368 | 1 | 500-650 GH/s | 12 W | ~22.0 J/TH | 5V barrel jack | Legacy |
| Bitaxe Ultra (200 Series) | BM1366 | 1 | 400-500 GH/s | 12 W | ~27.0 J/TH | 5V barrel jack | Legacy |
| Bitaxe Hex (700 Series) | BM1366 | 6 | ~3.0 TH/s | 65-75 W | ~23.0 J/TH | 12V XT30 | Legacy |
The BM1370 (Gamma, Duo, GT, Touch) is sourced from the Bitmain Antminer S21 Pro. It has the best efficiency and the most overclocking headroom. The BM1368 (Supra) is from the Antminer S21 family. The BM1366 (Ultra, Hex) is from the Antminer S19 XP. All single-chip models use a 5V DC barrel jack (5.5×2.1 mm). Multi-chip models (GT, Touch, Hex) use 12V XT30.
Every ASIC chip is subject to the silicon lottery: manufacturing variations mean your specific chip may overclock better or worse than identical models. Two BM1370 chips from the same production batch can have different stable ceilings. The settings in this guide are bench-tested starting points. Always tune for your specific unit.
How Overclocking Works: Frequency, Voltage, and Temperature
Three variables control your overclock. Understanding how they interact prevents hardware damage and unstable results.
Core Frequency (MHz)
Frequency determines how many hash computations the ASIC executes per second. The relationship is roughly linear: 50% more frequency yields approximately 50% more hashrate. In AxeOS, frequency adjusts in 25 MHz increments. Stock values: BM1370 defaults to 525 MHz, BM1368 to 490 MHz, BM1366 to 485 MHz.
Core Voltage (mV)
Voltage provides electrical headroom for higher frequencies. The BM-series chips use a Maxim DS4432U+ current DAC for digital voltage adjustment, typically 1100 to 1300 mV. When frequency exceeds what the current voltage can support, the chip produces invalid hashes (ASIC errors) or crashes. Increasing voltage restores stability but increases power and heat. Power scales with the square of voltage: a 10% voltage increase produces roughly 21% more heat.
Do not exceed 1300 mV for sustained 24/7 operation. Voltages above 1300 mV accelerate electromigration and shorten chip lifespan.
Temperature: The Limiting Factor
Every watt consumed becomes heat. When chip temperature rises too high, the ASIC produces increased computation errors (visible as rising hashrate error percentage in AxeOS), thermal throttling (AxeOS reduces frequency automatically), accelerated silicon degradation, and at extreme temperatures, automatic shutdown.
| Zone | Range | Status |
|---|---|---|
| Optimal | 40-55 °C | Full performance, maximum chip longevity |
| Acceptable | 55-65 °C | Safe for 24/7 operation |
| Caution | 65-75 °C | Monitor closely, not recommended sustained |
| Danger | 75-85 °C | Thermal throttling, degradation risk |
| Critical | 85+ °C | Auto shutdown, permanent damage risk |
The Diminishing Returns Curve
The relationship between frequency, voltage, and power is not linear. At lower overclocks, modest frequency increases yield proportional hashrate gains with minimal extra power. As you push higher, each 25 MHz step requires disproportionately more voltage and generates disproportionately more heat.
| Overclock Level | Hashrate Gain | Power Increase | Efficiency Impact |
|---|---|---|---|
| Stock | Baseline | Baseline | Best J/TH |
| Conservative (+10-20%) | +10-20% | +15-30% | Slight decrease |
| Aggressive (+30-50%) | +30-50% | +50-80% | Noticeable decrease |
| Extreme (+60-90%) | +60-90% | +100-200% | Significant decrease |
Maximum stable hashrate is almost always the right target when overclocking. The cost difference between 18W and 35W is approximately $1.50/month at $0.12/kWh. The performance difference is 770 billion additional hash attempts per second.
Pre-Overclocking Checklist
Do not skip these. Overclocking on a weak foundation produces unstable results and misleading data.
1. Power Supply
An undersized or noisy PSU is the number one cause of failed overclocks. Voltage ripple from cheap adapters causes ASIC errors identical to frequency instability.
| Model | Connector | Min PSU (Stock) | Recommended (OC) | Solo Satoshi PSU |
|---|---|---|---|---|
| Gamma 602 | 5V barrel jack | 5V / 4A (20W) | 5V / 10A (50W) | Mean Well LRS-50-5 |
| Duo 650 | 5V barrel jack | 5V / 6A (30W) | 5V / 10A (50W) | Mean Well LRS-50-5 |
| Supra | 5V barrel jack | 5V / 4A (20W) | 5V / 6A (30W) | 5V 6A PSU |
| Ultra (Legacy) | 5V barrel jack | 5V / 4A (20W) | 5V / 6A (30W) | 5V 6A PSU |
| GT 801 | 12V XT30 | 12V / 5A (60W) | 12V / 10A (120W) | 12.4V 124W PSU |
| Turbo Touch | 12V XT30 | 12V / 5A (60W) | 12V / 10A (120W) | 12.4V 124W PSU |
| Hex (Legacy) | 12V XT30 | 12V / 8A (96W) | 12V / 10A (120W) | Mean Well LRS-350-12 |
For Mean Well LRS units, use the trim pot to set output to 5.10-5.20V (5V models) or 12.1-12.4V (12V models). This compensates for cable voltage drop under load. Do not use phone chargers. Single-chip Bitaxe models use a 5V DC barrel jack, not USB-C. Complete wiring walkthrough: Beginner’s Guide to Mean Well Power Supplies.
2. Thermal Solution
Stock heatsinks handle stock settings. Overclocking demands better thermal transfer.
Heatsink: The Dark Horse pin-fin heatsink drops ASIC temperatures 7-10 degrees C versus stock at equivalent overclock settings. Compatible with all single-chip models (Gamma, Duo, Supra, Ultra).
Thermal paste: Replace stock thermal pads with Thermal Grizzly Kryonaut Extreme (14.2 W/mK). This alone drops temperatures 5-10 degrees C. Rice-grain-sized dot on the ASIC center, firm even heatsink pressure.
MOSFET heatsinks: Above 700 MHz on the BM1370, the VRM and surrounding MOSFETs overheat before the ASIC itself. AxeOS reports VR temperature on the dashboard, but many overclockers focus only on the ASIC reading and miss the VR climbing into dangerous territory. The VRM is rated for 100 degrees C per the manufacturer documentation, but sustained operation near that limit accelerates component wear. Our Gamma 602 bench data shows the VRM hitting 94 degrees C at 800 MHz while the ASIC sat at a safe 62.4 degrees C, just 6 degrees from the rated maximum. Our copper MOSFET heatsink kit drops VRM temps up to 15 degrees C. Exact placement locations: MOSFET Heatsink Placement Guide.
3. Baseline Benchmark
Run at stock settings for 24 hours. Record: average hashrate, ASIC temperature at steady state, fan speed, power draw (use a Kill-A-Watt meter), accepted/rejected shares, ASIC error count, and hashrate error percentage. Every overclock is measured against this baseline.
4. Firmware
Run the latest stable AxeOS. Check ESP-Miner GitHub releases. As of March 2026, v2.13.0 is current. The v2.11.0 release added hashrate register statistics initialization (PR #1263 by developer WantClue), enabling accurate error percentage reporting. Update guide: How to Update Bitaxe Firmware.
5. WiFi
All Bitaxe models connect to their mining pool over 2.4 GHz WiFi. Check RSSI in AxeOS. RSSI is measured in negative dBm, so values closer to zero are stronger:
- -30 to -50 dBm: Excellent. No connectivity concerns.
- -50 to -60 dBm: Good. Stable for 24/7 mining.
- -60 to -70 dBm: Fair. Monitor for stale shares.
- -70 dBm or worse (further from zero): Weak. Likely to cause stale shares and connection drops that mimic overclocking instability. Move closer to your router or add a 2.4 GHz extender.
6. Watt Meter
A Kill-A-Watt (or equivalent) plug-in meter lets you measure actual wall power at each setting. Pair it with your hashrate to calculate true J/TH efficiency per overclock step.
Step-by-Step Overclocking Process
This applies to every Bitaxe model. Specific values differ by chip (see profiles below).
Step 1: Access AxeOS
Navigate to your Bitaxe’s IP address in a browser (same WiFi network). The dashboard shows real-time hashrate, temperature, frequency, voltage, and share statistics.
Step 2: Increase Frequency by 25 MHz
Go to Settings. Increase frequency by 25 MHz from stock. Do not change voltage yet. Save no restart necessary. Wait 15-20 minutes. Monitor: hashrate from dashboard (should increase), temperature (few degrees higher expected), hashrate error percentage (should stay below 2%).
Step 3: Repeat Until Instability
If stable, increase another 25 MHz. Continue until you see: rising error percentage above 2%, sudden hashrate drops, reboots, or ASIC temperature exceeding 65 degrees C.
Step 4: Adjust Voltage
When the chip becomes unstable, two options. Conservative: back off 25 MHz and accept that ceiling. Aggressive: increase voltage by 25 mV and retry. Each voltage bump increases power and heat. Never exceed 1300 mV for 24/7 operation.
Step 5: Validate 24-72 Hours
A setting that looks stable for an hour can fail overnight as ambient temperature shifts. Run your candidate settings for at least 24 hours (48-72 preferred). Confirm: hashrate error percentage below 2% and ASIC temp below 65 degrees C, zero reboots.
Step 6: Record Your Settings
Firmware updates reset configuration. Write down: date, frequency, voltage, average hashrate, ASIC temp, VR temp, fan speed, power draw. Your chip’s silicon lottery result is unique. These numbers belong to your specific unit.
Bitaxe Gamma 602 Overclocking Profile (BM1370, 1 Chip, 5V)
The Gamma 602 is the most popular Bitaxe and the model with the most bench data. The BM1370 is a 3nm SHA-256 ASIC from the Antminer S21 Pro with the widest overclocking range in the Bitaxe lineup. Community miners have pushed single-chip units past 2 TH/s.
Bench conditions: 69°F (21°C) ambient, auto fan, Dark Horse heatsink, Mean Well LRS-50-5 at 5.15V input, and Kryonaut Extreme thermal paste.
| Freq (MHz) | Volt (mV) | Fan (%) | Noise (dB) | VR °C | ASIC °C | Hashrate (TH/s) | Power (W) | J/TH |
|---|---|---|---|---|---|---|---|---|
| 525 (stock) | 1150 | 44 | 43 | 57 | 49.3 | 1.07 | 17.8 | 16.6 |
| 600 | 1150 | 48 | 44 | 62 | 51.4 | 1.22 | 20.1 | 16.5 |
| 625 | 1250 | 59 | 46 | 71 | 56.1 | 1.27 | 25.2 | 19.8 |
| 700* | 1250 | 65 | 48 | 80 | 58.9 | 1.43 | 28.4 | 19.9 |
| 750 | 1250 | 68 | 49 | 86 | 60.3 | 1.54 | 30.2 | 19.6 |
| 800** | 1250 | 72 | 49 | 94 | 62.4 | 1.63 | 32.2 | 19.8 |
| 850 | 1250 | 71 | 48 | 81 | 61.8 | 1.73 | 33.0 | 19.1 |
| 900*** | 1250 | 74 | 50 | 90 | 64.3 | 1.84 | 35.2 | 19.1 |
* 700+ MHz: use a 50W PSU. ** 800+ MHz: add MOSFET heatsinks. *** 900 MHz: experienced overclockers only, silicon lottery applies heavily.
The BM1370 runs up to 600 MHz at stock voltage (1150 mV) with minimal temperature increase, a 14% free hashrate gain. The sweet spot for most users is 700-750 MHz at 1250 mV (1.43-1.54 TH/s). Note the VR temperature column: at 800 MHz without MOSFET heatsinks, the VRM hits 94 degrees C. That is the real bottleneck, not the ASIC itself. The 850 MHz row shows VR temp dropping to 81 degrees C because MOSFET heatsinks were installed between tests.
Dedicated deep-dive: How to Overclock Bitaxe Gamma.
Bitaxe Duo 650 Overclocking Profile (2x BM1370, 5V)
The Bitaxe Duo 650 packs two BM1370 chips in the same footprint as the Gamma. 1.63 TH/s at 25.8W stock. Same 5V barrel jack. Both chips respond to settings simultaneously. Thermal ceiling is lower than the Gamma because two heat sources share one heatsink.
| Profile | Freq (MHz) | Volt (mV) | Hashrate (TH/s) | ASIC °C | Power (W) | J/TH |
|---|---|---|---|---|---|---|
| Stock | 525 | 1150 | 1.63 | 50-55 | 25.8 | 15.8 |
| Conservative | 600 | 1150 | 1.87 | 54-58 | 30 | 16.0 |
| Aggressive | 700 | 1250 | 2.20 | 58-63 | 42 | 19.1 |
| Extreme | 800+ | 1250 | 2.50+ | 62-68 | 50+ | 20.0 |
At 600 MHz / stock voltage, the Duo delivers 1.87 TH/s, matching an aggressively overclocked single Gamma. The Duo was designed as a plug-and-play budget performer. Conservative to moderate overclocking is the sweet spot. Aggressive (700+ MHz) requires MOSFET heatsinks, and 50W PSU.
Full breakdown: Bitaxe Duo 650: The Sweet Spot Between the Gamma and the GT.
Bitaxe GT 801 Overclocking Profile (2x BM1370, 12V)
The Bitaxe GT 801 is the highest-performance open-board Bitaxe. Two BM1370 chips, 60mm fan, oversized heatsink, 12V XT30 power. 2.15 TH/s stock. Designed from the ground up for overclocking.
| Profile | Freq (MHz) | Volt (mV) | Hashrate (TH/s) | ASIC °C | Power (W) | J/TH |
|---|---|---|---|---|---|---|
| Stock | 525 | 1150 | 2.15 | 48-55 | 43 | 20.0 |
| Conservative | 600 | 1200 | 2.50 | 52-60 | 50 | 20.0 |
| Aggressive | 750 | 1250 | 3.10 | 58-65 | 65 | 21.0 |
| Extreme | 900+ | 1250-1300 | 3.60+ | 62-70 | 80+ | 22.2 |
At 750 MHz / 1250 mV, the GT delivers 3.10 TH/s, more than two stock Gammas combined from a single board. The 12V XT30 provides cleaner power delivery than 5V barrel jack systems, which improves stability at high frequencies. The 60mm cooling fan runs quieter than 40mm fans even at higher RPMs.
Bitaxe Turbo Touch Overclocking Profile (2x BM1370, 12V, Enclosed)
The Bitaxe Turbo Touch uses the GT 801 platform inside a custom enclosure with a 4.3″ capacitive touchscreen and dual-side honeycomb vents. Same 2.15 TH/s stock. It ships with three built-in performance modes selectable directly from the touchscreen, plus full manual overclocking via AxeOS.
| Profile | Freq (MHz) | Volt (mV) | Hashrate (TH/s) | ASIC °C | Power (W) |
|---|---|---|---|---|---|
| Stock | 525 | 1150 | 2.15 | 50-58 | 43 |
| Low (preset) | ~575 | ~1175 | 2.34 | 53-60 | 41 |
| Medium (preset) | ~600 | ~1200 | 2.44 | 55-62 | 45 |
| High (preset) | ~650 | ~1200 | 2.67 | 58-64 | 48 |
| Manual Aggressive | 750 | 1250 | 3.06+ | 62-68 | 65 |
| Manual Extreme | 850+ | 1250-1300 | 3.40+ | 66-73 | 78+ |
The enclosed case adds 3-5 degrees C versus the open-board GT at equivalent settings. The built-in presets make this the most beginner-friendly Bitaxe for overclocking: tap a mode, done. For manual overclocking beyond presets, ensure clearance around the honeycomb vents. Do not place flush against a wall or inside a closed cabinet. The touchscreen continues showing live stats across all 8 screens regardless of overclock level.
Setup guide: Bitaxe Turbo Touch Setup Guide.
Bitaxe Supra Overclocking Profile (BM1368, 1 Chip, 5V)
The Bitaxe Supra runs the BM1368 from the Antminer S21. 12W stock for 500-650 GH/s. Less overclocking headroom than the BM1370, but the BM1368 responds well to moderate tuning. The Supra’s low power draw gives generous thermal margin during tuning, making it excellent for beginners learning the process.
| Profile | Freq (MHz) | Volt (mV) | Hashrate (GH/s) | ASIC °C | Power (W) | J/TH |
|---|---|---|---|---|---|---|
| Stock | 490 | 1200 | 400-650 | 45-55 | 12 | 22.0 |
| Conservative | 550 | 1200 | 550-700 | 50-60 | 15 | 23.1 |
| Aggressive | 600 | 1250 | 650-750 | 55-65 | 19 | 26.6 |
| Extreme | 700+ | 1300 | 750-900+ | 60-70+ | 25+ | 30.0+ |
Many BM1368 chips reach 550 MHz at stock voltage on good silicon. Extreme (700+ MHz) requires upgraded cooling.
Bitaxe Ultra Overclocking Profile (BM1366, 1 Chip, 5V) (Legacy)
The Ultra is a legacy model using the BM1366 from the Antminer S19 XP. No longer manufactured, but many units remain in service. The BM1366 is a mature chip with good overclocking headroom that responds well to frequency increases and is forgiving at moderate voltage bumps.
| Profile | Freq (MHz) | Volt (mV) | Hashrate (GH/s) | ASIC °C | Power (W) | J/TH |
|---|---|---|---|---|---|---|
| Stock | 485 | 1200 | 400-500 | 45-55 | 12 | 27.0 |
| Conservative | 525 | 1200 | 500-575 | 50-60 | 14 | 26.0 |
| Aggressive | 575 | 1250 | 575-650 | 55-65 | 18 | 29.0 |
| Extreme | 625+ | 1300 | 650-750+ | 60-70+ | 22+ | 31.0+ |
Many BM1366 chips reach 525-550 MHz without any voltage increase. Extreme overclocking above 600 MHz requires upgraded cooling. The Ultra was the first Bitaxe model to solo mine a full block: block #887,212 (March 2025, 3.125 BTC at ~0.48 TH/s, 619 million shares submitted).
Bitaxe Hex Overclocking Profile (6x BM1366, 12V) (Legacy)
The Hex runs six BM1366 chips in parallel on a single board. Legacy model, no longer in production. Same overclocking principles as the Ultra, but thermal and power considerations are multiplied by six. The 12V XT30 delivery is more robust than 5V systems.
| Profile | Freq (MHz) | Volt (mV) | Hashrate (TH/s) | ASIC °C | Power (W) | J/TH |
|---|---|---|---|---|---|---|
| Stock | 485 | 1200 | ~3.0 | 50-58 | 70 | 23.3 |
| Conservative | 525 | 1200 | ~3.3 | 55-62 | 80 | 24.2 |
| Aggressive | 575 | 1250 | ~3.7 | 58-66 | 100 | 27.0 |
| Extreme | 625+ | 1300 | ~4.0+ | 62-70+ | 120+ | 30.0+ |
Six chips mean six times the heat. Aggressive overclocking may require supplemental airflow (desk fan pointed at the device or a dedicated enclosure). Monitor individual chip temperatures if your firmware supports it. One hot chip can throttle the entire board. Power at extreme overclocks approaches 120W.
All Bitaxe Models Compared: Stock vs Overclocked
| Model | ASIC | Chips | Input | Stock Hash | Stock W | OC Hash (Aggressive) | OC W | Status |
|---|---|---|---|---|---|---|---|---|
| Gamma 602 | BM1370 | 1 | 5V | 1.07 TH/s | 17.8 | 1.54 TH/s | 30.2 | Current |
| Duo 650 | BM1370 | 2 | 5V | 1.63 TH/s | 25.8 | 2.20 TH/s | 42 | Current |
| GT 801 | BM1370 | 2 | 12V | 2.15 TH/s | 43 | 3.10 TH/s | 65 | Current |
| Turbo Touch | BM1370 | 2 | 12V | 2.15 TH/s | 43 | 3.06 TH/s | 65 | Current |
| Supra | BM1368 | 1 | 5V | 650 GH/s | 12 | 750 GH/s | 19 | Legacy |
| Ultra | BM1366 | 1 | 5V | 500 GH/s | 12 | 650 GH/s | 18 | Legacy |
| Hex | BM1366 | 6 | 12V | 3.0 TH/s | 70 | 3.7 TH/s | 100 | Legacy |
Cooling Solutions for Overclocking
Cooling is the fundamental constraint. Every overclocking ceiling you hit is a thermal wall.
Stock Heatsink Limitations
The heatsink that ships with your Bitaxe depends on where you purchased it. Some sellers ship with a basic 40x40x15mm aluminum block. Others, including Solo Satoshi, ship with upgraded cooling like the Dark Horse pin-fin heatsink on the Gamma 602 and Duo 650. The overclocking ceiling you hit is directly tied to the heatsink your unit arrived with. A basic aluminum block will typically limit you to 550-600 MHz on the BM1366/BM1368 and default settings on the BM1370 before temperatures exceed safe sustained limits. A higher-performance heatsink pushes that ceiling significantly higher.
Upgraded Heatsinks
The Dark Horse heatsink uses a high-density pin array with black anodized coating for increased convective surface area and radiative emissivity. 7-10 degrees C lower ASIC temperatures versus stock at the same settings. That translates directly into higher stable frequencies.
Fan Upgrades
The OEM 40mm fan that ships with Solo Satoshi Bitaxe units pushes 9 CFM at 7,500 RPM. By comparison, the popular Noctua NF-A4x10 moves 4.83 CFM at 4,500 RPM. Noctua fans are quieter because they spin slower, but they move roughly half the air. For overclocking, air volume is more important than noise. The OEM fan is the superior choice when pushing frequencies because it delivers the airflow the heatsink needs to dissipate the additional heat. If noise is your priority over hashrate, a Noctua is a reasonable trade, but understand that you are giving up cooling capacity.
3D Printed Stands and Airflow
The stackable stand elevates the device for convection airflow underneath while directing exhaust outwards and upwards Free STL downloads: Gamma stand, GT stand. For multi-unit setups, space miners apart so exhaust heat from one does not become intake air for the next.
Thermal Paste Replacement
Power off and cool completely. Remove heatsink. Clean ASIC surface and heatsink base with 90%+ isopropyl alcohol and lint-free cloth. Apply rice-grain dot of Kryonaut Extreme (or equivalent, 10+ W/mK) on ASIC center. Remount heatsink with firm, even pressure. Expect 5-10 degree C improvement.
Ambient Temperature Math
ASIC temp = ambient temp + temperature rise from power dissipation. If your cooling adds 30 degrees C above ambient: 15 degree C basement = 45 degree C ASIC (optimal). 22 degree C living room = 52 degree C (acceptable). 30 degree C summer room = 60 degree C (caution). Position your Bitaxe in the coolest spot available. Avoid enclosed cabinets, confined spaces, and direct sunlight.
VRM Cooling
MOSFET heatsinks: At aggressive overclocks above 800 MHz on the BM1370, the VRM runs significantly hotter than the ASIC. AxeOS reports both ASIC and VR temperature on the dashboard. Per the ESP-Miner firmware (power_management_task.c), overheat mode triggers when the VR exceeds 105 degrees C. When triggered, AxeOS sets the fan to 100%, disables core voltage, and resets frequency and voltage to safe defaults. Our Gamma 602 bench data shows the VRM reaching 94 degrees C at 800 MHz without MOSFET heatsinks, just 11 degrees from the overheat threshold. Adding our copper MOSFET heatsink kit drops VRM temps up to 15 degrees C, restoring safe headroom. See the MOSFET Heatsink Placement Guide for exact locations per board.
Advanced Techniques
Undervolting for Efficiency
Reduce core voltage by 25 mV increments from stock while keeping frequency at stock. If errors stay below 2%, you have gained free efficiency. Some BM1370 chips drop 50-100 mV below stock while maintaining full hashrate. Useful for multi-unit setups on limited power, solar deployments, or high ambient temperatures.
Seasonal Tuning
Run aggressive profiles in winter (extra thermal headroom due to ambient temperature). Drop to conservative in summer. A 7 degree C ambient swing can push a stable overclock into instability.
Custom Fan Curves
AxeOS lets you set target temperature and max fan speed. For overclocking: target 55-60 degrees C, allow fan to 80-100%. A louder fan beats a throttled chip.
Auto-Tuning Scripts
The open-source community has built auto-tuning tools that use the AxeOS API to incrementally find optimal settings. Projects like bitaxe-gamma-oc-script and BitaxePID adjust frequency and voltage while monitoring hashrate and temperature. Useful for hands-off tuning, but always validate results with your own 24-hour stability test.
Hashrate Benchmarking
The Bitaxe Hashrate Benchmark tool logs hashrate, temperature, and error data over time from the AxeOS API. Useful for validating overclock stability across long test windows and comparing your chip’s performance against community-submitted results. Run it alongside your 24-hour stability test to generate a data log you can reference when fine-tuning settings.
Multi-Unit PSU Wiring
The Mean Well LRS-350-5 delivers 5V at 60A (300W). Wire up to six single-chip Bitaxe miners using barrel jack pigtails to the screw terminals. The LRS-350-5 has 3 +V and 3 -V terminals, max 2 wires per terminal = 6-miner physical limit. For 12V multi-unit setups, the Mean Well LRS-600-12 powers multiple GT 801 units via XT30 pigtails.
Monitoring Hashrate Errors During Overclocking
The hashrate error percentage displayed in AxeOS is the single most important metric for tuning your overclock. It is a hardware-level measurement from registers built into the ASIC chip itself. Register 0x8C counts total hashes computed. Register 0x4C counts computational errors. The ESP-Miner firmware reads both every 5 seconds and calculates: error_percentage = (error_hashrate / current_hashrate) x 100.
At stock settings, healthy chips show 0 to 2% errors. Above 2%, the chip is approaching its stability limit at the current frequency and voltage. Above 5%, you are wasting electricity on invalid computations that contribute nothing to finding a block. Above 10%, reduce frequency immediately.
This metric is not the same as rejected shares. Hashrate errors happen inside the ASIC chip during computation. Rejected shares are a network latency metric between the miner and the pool. They are unrelated to your overclock settings.
Using the Error Percentage as a Tuning Guide
The hashrate error percentage is the best tool for finding your chip’s silicon lottery ceiling. Increase frequency until errors rise above 2%, then back off 25 MHz. That is your specific chip’s sweet spot. A slightly lower frequency with 1% errors outperforms a higher frequency with 8% errors, because more of your computation produces valid work. For a full technical breakdown of how the error percentage is calculated from ASIC registers, read What Is the Hashrate Error Percentage on Bitaxe?
Troubleshooting
ASIC Not Found After Overclock
Cause: Frequency/voltage too aggressive for the chip to initialize.
Fix: Power cycle (unplug 10 seconds). If AxeOS loads, quickly restore stock values. If not, hold boot button during power-on for factory reset. Last resort: reflash firmware via USB. Guide: firmware update.
High Rejection Rate (Above 1-2%)
Cause: Frequency too high for the current voltage, or ASIC temperature approaching instability threshold.
Fix: Increase voltage by 25 mV or reduce frequency by 25 MHz. Monitor the hashrate error percentage in AxeOS for 15 minutes after each adjustment. Target below 2% for stable 24/7 operation.
Thermal Throttling
Cause: Cooling cannot dissipate heat at current settings.
Fix: Reduce frequency until ASIC stays below 65 degrees C. Then address the thermal bottleneck: Dark Horse heatsink, Kryonaut Extreme paste, MOSFET heatsinks, better airflow, lower ambient temp.
WiFi Disconnects Under Load
Cause: Higher power draw creates electrical noise that interferes with the ESP32-S3 WiFi radio. Poor PSU quality amplifies this.
Fix: Better PSU with cleaner regulation. Move closer to router. Reduce 2.4 GHz interference. Check PSU voltage under load with multimeter: below 4.9V on 5V models means the PSU is sagging.
Hashrate Fluctuates Wildly
Cause: Overclock is on the stability edge. Temperature fluctuations push the chip in and out of stable operation.
Fix: Reduce frequency by 25-50 MHz for stability margin, or increase voltage by 25 mV. Check for HVAC cycling or window drafts affecting ambient temp.
Unexplained Reboots at High Frequencies
Cause: VRM overheating.
Fix: Add copper MOSFET heatsinks. See placement guide. If problem persists, direct airflow across PCB backside.
Reverting to Safe Settings
Through AxeOS: Settings page, restore stock frequency and voltage for your chip (see model reference table above). Firmware reflash: reflash via USB restores all defaults (check “keep configuration” box to keep Wi-Fi credentials).
Overclocked Bitaxe Miners Have Won Real Blocks
Bitaxe miners running the same hardware Solo Satoshi sells have earned over $1 million in documented block rewards with on-chain verification via solo.ckpool.org and mempool.space:
Block #924,569 (November 21, 2025): Six Bitaxe Gamma 602 workers, ~6.6 TH/s combined, CKPool. Payout: 3.08349744 BTC (~$310,000). Best-ever difficulty: 221.39 T. Address: 3K99ATGytaz1Ns2xNiJfjQbECz5ewnCt8M.
Block #887,212 (March 10, 2025): Single Bitaxe Ultra, ~0.48 TH/s, solo.ckpool.org. Payout: 3.125 BTC (~$250,000). 619 million shares submitted before finding the block.
Block intervals between documented open-source mining wins have shrunk from 229 days to 179 to 52 to 25 days, reflecting accelerating adoption. Overclocking is a direct contributor.
Shop All Bitaxe Miners →
Does overclocking void my Bitaxe warranty?
What is the maximum wattage the 5V barrel jack can handle?
Does the power consumption in AxeOS include the fan?
Why does my hashrate in AxeOS differ from my pool dashboard?
Can I run multiple overclocked Bitaxe units on one power supply?
How often should I reapply thermal paste on an overclocked Bitaxe?
What is the difference between the Gamma 601 and 602 for overclocking?
Can I use auto fan control in AxeOS while overclocking?
Does overclocking increase my electricity cost enough to matter?