The answers to your questions

1. General issues

Is it possible to rent out my ASIC, how can I do it, I've heard renting out ruins ASICs?

Services where you can rent out your ASIC hash power:

  1. Miningrigrentals – an excellent service for renting out your hash power. Renting is possible for BTC, LTC, ETH, BCH. Profitability compared to mining pools is over 10% higher. Instructions on how to set up the service can be found here or here.

  2. Nicehash – thanks to regular payouts, excellent support, high security, system stability, and delivery of a massive amount of mining power, NiceHash has quickly become a well-known brand among cryptocurrency miners. ATTENTION! For XNSUB to work correctly, you need to add the /#xnsub key to the stratum server address (on custom firmware), or #xnsub on the stock firmware. More information about what XNSUB is and how it improves ASIC performance on Nicehash can be found HERE.

There are many opinions that renting out your ASICs ruins them. From our experience, we haven’t noticed any specific connection between rentals and breakdowns using the Miningrigrentals service for over half a year. However, the decision is entirely up to you. You are the equipment owner, and all possible risks lie with you!

"What does HW and other names in the ASIC interface mean?"

Miner light signals analysis and methods for troubleshooting.

Ⅰ. Signal Lamp: Malfunction (Red) / Operation (Green).
Under normal circumstances: Green light flashes, red light does not.
In abnormal situation:
Red light flashes.
1. High temperature.
2. Internet connection lost: check network, reconnect.
Green light stays on constantly.
1. Network problem.
2. IP problem.
Neither red nor green lights are on.
Reason: Fan failure—-replace fan with new one or return fan to factory for repair.
Red light flashes, green light is off.
Reason: Duplicate IP addresses.
IP repeated (one static, one dynamic): set all IPs to static.
Ⅱ. Network Interface Lamp
Under normal circumstances: Yellow light stays on constantly, green light flashes.
In abnormal situation: Neither yellow nor green lights are on.
1. Network cable is loose: reinsert network cable.
2. Control panel malfunction: return to factory for repair.
3. No power to the switch: supply power to the switch.

Few words about mining modes (made by ChatGPT):

PPS (Pay Per Share) – is a cryptocurrency mining mode where the miner receives a fixed reward for each share they contribute to the mining pool. Regardless of how effective the miner is at solving the task, they will receive a certain amount for each share provided. In this mode, the miner is not dependent on the overall success of the mining pool and receives a stable reward for their work.

PPS+ (Pay Per Share Plus) – is an enhanced version of the PPS mode, where the miner receives additional rewards based on the performance of the mining pool. In addition to the fixed amount for each share, the miner also receives a bonus based on the overall success of the pool. This mode allows miners to receive higher payouts if the mining pool achieves good results.

SOLO (Solo Mining) – is a mining mode where the miner works alone, without participating in a mining pool. In this mode, the miner independently solves tasks and receives all rewards for the found cryptocurrency blocks. SOLO mining can be profitable if the miner has a sufficiently large computing power, but it also carries the risk of not receiving any reward if a new block is not found.

PPLNS (Pay Per Last N Shares) – is a mining mode where the miner’s reward is determined based on the number of shares they have contributed in the last specified period of time (N). Here, the significance of each share decreases over time, and the miner receives a payout proportional to the number of shares they contributed in the last period of time. This mode allows miners to receive higher payouts if they consistently contribute shares over a certain period.

PROP (Proportional) – is a mining mode where the miner’s reward is determined proportionally to their contribution to the mining pool’s work. In this mode, each miner receives a payout proportional to the number of shares they contribute to the pool. If a miner contributes more to the pool’s work, they will receive a larger share of the reward according to their contribution to the pool’s total computing power. This mode is commonly used in large mining pools, where fair distribution of rewards is important for miners.

Tests of power consumption for common fans used to cool your miners.

Video opens in full size on PC with a double click.

How to create your own VPN server in about 30 minutes and for approximately 30 dollars a year?

Nice manual on setting up your own WireGuard server can be found Here!
I would like to add that at the end of step 3 “Installing the WireGuard server,” you need to enter the following command in the console:
apt-get install linux-headers-$(uname -r|sed ‘s/[^-]*-[^-]*-//’)
I couldn’t bring up the VPN tunnel without it. Any questions about setting up a VPN server can be asked in the general chat.
For myself, I found a decent VPS server in Germany:
With my internet speed of 300 Mbps, the tunnel speed fluctuates around 120 Mbps (I set up the tunnel on a Keenetic router, only passing through it devices that require a constant VPN)..

2. Antminer S19 Hydro ASIC-miners

"What models of Antminer Hydro ASICs are being produced, and what are their differences?"
  • S19 Hydro and its twin brother, S19 Hydro, have a hashrate of 132-158 TH/s with 104 chips 1398bb on the board (similar to S19 with 76 chips). There are 8 temperature sensors on the board, likely measuring the temperature directly from the chips rather than calculating it mathematically relative to the board temperature. They have an energy efficiency of 25-35 watts/TH and can be overclocked to 180-200 TH/s with power consumption up to 6500 watts. The water blocks are large and have high hydro resistance.
  • S19Pro Hydro and its twin brother, S19Pro Hyd, have a hash rate of 170-184 TH/s with 180 chips 1362AC (similar to S19jpro PCB). There are 4 temperature sensors on the board, and in the stock firmware, only board temperature is measured. The chip temperature in 7Miners Vnish firmware is calculated mathematically, with a +15 (in previous firmware) or +5 (in newer firmware) offset relative to the board temperature. They have an energy efficiency of 22-33 watts/TH and can be overclocked to 220-240 TH/s with power consumption up to 6500 watts. The water blocks are approximately 30% smaller than those on the S19 Hydro, resulting in lower hydro resistance.
  • S19Pro+ Hydro differs from S19Pro Hydro only in chips (1362AC like in S19 with 126 chips) and has a stock hashrate of 191 TH/s. There is limited information available about them.
What are the power requirements for the Hydro series?

The Hydro series requires connection to a three-phase power supply. The connector for the Hydro contains 4 contacts – 3 phases and grounding. The neutral conductor is not used. The interphase voltage should be between 340-420 volts. It will not operate on a single-phase power supply. It is possible to operate without grounding, using only three phase conductors. However, it is not recommended to operate without grounding as there is a risk of electric shock in case of malfunction and the possibility of electrolysis.

What is used to cool the Hydro series ASICs?

Cooling for the Hydro series ASICs can be achieved using:

– Water-cooling heat exchangers;
– Air conditioner blocks;
– Car radiators;
– Refrigeration condensers;
– Swimming pools;
– Home heating during the winter period;
– Utilizing pipes in rivers/creeks/lakes;
– Specialized Chinese radiators (not recommended).

Is it worth buying Chinese radiators for cooling the Hydros (supposedly 12 kW)?

These radiators are intended for testing ASICs or demonstration stands. They are not effectively cool a single Hydro. They are very noisy.

What coolant should be used for the Hydro?

The ideal coolant is water after reverse osmosis. To prevent the growth of bacteria or algae in the water, it is recommended to use an antiseptic or a small amount of ethylene glycol (poisonous). In winter, various antifreezes can be used, diluted according to the temperatures in your area. The lower the water content, the worse the cooling will be.

What is the optimal temperature of the coolant?

From +25 to +40 degrees Celsius at the input to the ASIC. 

What is the maximum water temperature can I get at the output of the miner?

Without downvolt (reducing the operating voltage), it can reach approximately +53 degrees Celsius. With downvolt, it may be possible to achieve higher temperatures, but there is no information available on specific values.

What is the optimal chip temperature for the Hydras?
  • For S19 Hydro, the optimal temperature range on the chips is 65-80 degrees Celsius.
  • For S19Pro Hydro, the optimal temperature range on the boards is 58-68 degrees Celsius.

On the latest 7Miners Vnish firmware, the chip temperature will be +5 degrees Celsius from the board temperature, while on previous firmware, it will be +15 degrees Celsius from the board temperature.

On stock firmware, the Hydro does not start, and the log shows an error about the water being too cold. What should I do?

Install the 7Miners Vnish firmware or heat up the water. However, with our firmware, it is not recommended to start the ASIC at a water temperature below +15 degrees Celsius, while on stock firmware, there is a software limit of no lower than +20 degrees Celsius.

Is it possible to run Hydro ASICs at negative temperatures?

We strongly advise against running the ASIC at a coolant temperature below +10 degrees Celsius. Some users have even run it at negative coolant temperatures, but often this has led to hashboard failures over time.

What to do if my Hydro shows a temperature sensor error?

In the advanced mining settings of the 7Miners Vnish firmware, enable “Ignore non-working temperature sensors.” This is safe because temperature sensor errors are usually software-related, and the sensors themselves are functioning properly. However, if a sensor shows an unrealistic temperature (for example, 255 degrees), it indicates that repair is needed.

If my Hydro starts gaining hashrate and then restarts, what should I do?

In the advanced mining settings of the 7Miners Vnish firmware, reduce the “Increase chip voltage at startup” parameter to 0.5V or 0V.

If the boards on the ASIC miner show 0 chips, what to do?

Check the water temperature. Heat the water to a temperature ranging from +20 to +40 degrees Celsius. Try disabling the configured profile, reset all settings, and run the miner at stock voltage and frequency values. Additionally, without increasing the frequency, you can try increasing the voltage to 20 volts. 

3. Antminer x19 series ASIC-miners

What film covers the surface of hashboards?

What is the purpose and meaning of the film covering the hashboards of the 19th series with slots opposite the chips?

The purpose is very simple for anyone who has ever disassembled the boards and seen how the power buses are routed inside them. Still not getting it? Considering that the buses are very powerful, with huge currents and the proximity between these exposed buses and the radiators is extremely high. Consequently, if it weren’t for this additional and powerful dielectric, all the dust, insects that get sucked into the fans, accumulates in these small gaps between the buses and the radiator. Where there’s a bit of humid air and… right, resistance builds up in the dust accumulations, and consequently, arcing can occur. That’s the purpose of this film. And the Chinese aren’t fools; they calculated that it would be better this way. Andrey also correctly wrote that everyone is free to act as they see fit, but advising others to deliberately reduce the reliability of the device is completely unreasonable!


How to distinguish the S19 90 TH/s version by its packaging?

J1-11 – 126 chips on the hashboard
240-Ch – 88 chips on the hashboard

What types of PSU suitable for x19 series, and how to upgrade them?

The S19 series ASICs have different versions of the APW12 power supply. Before purchasing an APW12 power supply, be sure to check the sticker on your device.
Currently, the following versions are known: 1215a, 1215b, 1215c, 1215d, 1215e, 1215f

1️⃣ Versions APW121215a/b/c are universal among themselves (without voltage feedback).
2️⃣ Versions APW121215d/e/f are universal among themselves (with voltage feedback).
3️⃣ Version APW121215d/e/f can replace part a/b/c by firmware update, but version a/b/c cannot be used with replacement d/e/f.

Additionally, you can modify the power supply for use with overclocked ASICs, instructions for the APW-12 power supply are below. 👇

Download the instruction guide (RU)


What hash rate and real power consumption does K Pro 115 TH have on the 7Miners Vnish firmware?

Stock Aug: 115-117TH – Power: 2700w – 23.4 J/T

7Miners Vnish 1.2.1
Preset 3270 (126TH)
Hashrate: 122TH*
Power: 2750w
with target 70° – 2750w
with target 65° – 2700w
Power efficiency: 22.6 J/T

Preset 3400 (131TH)
Hashrate: 127TH*
Power: 2900w (Target temp 65°c)
Power efficiency: 22.9 J/T

Preset 3530 (136TH)
Hashrate: 132TH*
Power: 3100w (Target temp 65°c)
Power efficiency: 23.5 J/T

Preset 3660 (142TH)
Hashrate: 137TH*
Power: 3300w (Target temp 65°c)
Power efficiency: 24.1 J/T

Preset 3920 (152TH)
Hashrate: 145TH*
Power: 3600w (Target temp 65°c)
Power efficiency: 24.8 J/T

*”Net” hashrate, after deducting the 2.8% commission.

Working Temperature: ~10°C

4. Antminer L7 ASIC-miners

What are the versions of L7 and what is the difference between them?

Currently, there are versions ranging from 9500 to 8050 MH/s. In terms of hardware components, quantity, and chip branding, the devices are identical. From a technical and software standpoint, starting from 9500 down to 8800, it involves chip selection and voltage and frequency tuning from the factory. From 8550 onwards, it involves refurbishment (reconditioned, repaired, cleaned, and restored). In other words, these are used boards with reduced voltages and frequencies assembled in new casings with new power supplies at the Bitmain factory.

Which pool is better to use with L7?

ViaBTC – one of the leaders in the mining world. LTC + DOGE is mined on the L7.
Advantages: stable payouts, automatic payouts without commission, the option for auto-conversion into the cryptocurrency of choice for the user, the ability to choose between PPLNS or PPS+ mining methods. Calculations are also conducted in LTC and DOGE. Pool commission is 4% (PPS+).
Users of our chat have an exclusive opportunity to receive poil fee permanent discount, reducing it to 1.5% for mining any of the coins available on the pool. This means that the pool fee for our participants using the PPS+ payment system is 2.5% instead of the usual 4%. To get the discount, contact the chat administrator @AndreyRR1977 via DM.
Mining servers:

Litecoinpool – One of the oldest and most stable European pools. Mining is done using the PPS+ system. LTC + DOGE is mined there. Pool commission – 0%.
Mining servers:

Trustpool – a popular mining pool in the Russian segment. Operates on the PPS+ system. LTC+DOGE is mined. Daily automatic payouts without commission. Pool commission – 1%.
Mining servers:

Participants of our chat have a PERMANENT discount on the commission of 20% off its regular value.
If you have a large hashrate starting from 5 PH for BTC and from 150 GH for LTC+DOGE, contact us for an individual offer for an even greater discount percentage!
To get the discount, contact @AndreyRR1977 via DM.

Mining Dutch – a European multipool with a wide range of mined coins and the ability to automatically switch between them based on the highest profitability. It’s also notable because it’s the only known pool where you can mine DGB+DOGE.
Mining server:

ATTENTION! The profits of all the above-mentioned pools are approximately the same on average per month!

What is the daily profitability of the L7?

The profitability of the ASIC varies every day depending on the network difficulty and the exchange rate of the mined cryptocurrency. Therefore, it’s better to use calculators available at the following links:

Calculators for estimating profitability:


Technical and repair information

You can find circuit diagrams and other technical information necessary for repairing the L7 by this link.

The chips on all models are the same. The difference lies only in where the crystal is cut from – from the center or from the edge of the wafer. This is called chip binning or grading. Chips from the center are considered the best. Bin1 is the best marking option on the board, bin5 is the worst.

The fan performance of the L7 is 270-350 cubic meters per hour.

There are 4 temperature sensors on the L7. They are connected to chips 47, 48, 56, and 118 (counting from zero).

The following fans can be installed on the L7:
– FCN with 7 blades and a power of 3.14 A.
– Delta with 7 blades and a power of 2.7 A. According to reviews, they maintain the chip temperature range around 71-75 degrees Celsius at different ambient temperatures. Average speeds range from 3200 to 5600.
– Martech with 7 blades and a power of 2.7 A.
– Nidec with 5 blades and a power of 1.65 A.

5. Whatsminer 20/30/50 Series ASIC-miners

What is the difference between Whatsminers with similar hashrate, but with different price?

The main difference lies in energy efficiency.

Let’s consider 2 devices, the Whatsminer M30S+ 102th. As you can see  at the photo (marked in blue), for  example, these values ​​will be 32w/th and 34w/th for the cheaper device.

Decoding the Whatsminer serial number

Decoding the Whatsminer serial number: ZDM1EK503123032110060144133A41091

50 – v5.0 revision

31 – 31wt/th energy efficiency

230321 – YY/DD/MM manufacturing date

100 – 100th hashrate

60 – 1960 type chip 

14 – 14v PSU voltage

413 – 41*3 (123 chip) quantity of chips per hashboard

About successful and unsuccessful revisions of the Whatsminer M50.

Some revisions of the M50 series Whatsminer have encountered a strange phenomenon. Some owners complain of frequent breakdowns and warranty repairs, while others are simply pleased with the stable performance of the device without any issues. So what’s the problem?

Certain revisions of the M50 have inherent factory defects that become apparent almost immediately after the device is plugged in. We recommend familiarizing yourself with the successful revisions of the M50 so that you can immediately recognize which device has the least factory defects at the time of purchase:

Successful revisions: VH8.4, VJ2.2

Unsuccessful revisions: VH7.5, VH8.5, VH2.0

How to determine what hashrate increase I can expect with the 7Miners Whatsminer firmware?

There is no definitive answer to this question, as the overclocking potential of the Whatsminer is always limited by the power supply unit. The peak power of the power supply unit for 30/50 series devices is 3800w. For rough approximate calculations, you can use the following formula: 3800 divided by the energy efficiency of the ASIC. For example, for the M30S+ 104 TH with 32w/th efficiency, the calculation would be 3800 divided by 32, resulting in 118 TH. However, it’s important to note that 3800w is the peak power of the power supply unit, and prolonged operation of the ASIC at 3800w consumption may lead to power supply unit failure. For continuous operation, it’s recommended to use a value of 3600-3650w: 3600 divided by 32, resulting in 112.5 TH.

The 7Miners team recommends installing the 7Miners firmware and checking the peak performance of your device on the standard power supply unit by generating overclocking profiles. To generate overclocking profiles, install the 7Miners firmware, go to Miner Configuration – Overclocking – Generate Profiles. Wait for 20-30 minutes for the device to generate profiles, and then choose the one you prefer.

Whatsminer PSUs compatibility

Where can I download WhatsminerTool manual?

Download HERE!