On May 19th, 2019, MicroBT’s new product launch with the theme of “Ultimate Win-Win, Success Reproduction” was held in Chengdu, China. MicroBT officially released the latest Whatsminer M20 series, a total of five models equipped with 8nm Samsung chips. Meanwhile, MircroBT’s new LOGO also revealed what was more vivid with better features.

Whatsminer M20 series nominal parameters are as follows.

Whatsminer M20S-68T is the highest hashrate model. Nominal power consumption is 48W/T. Recently, EastShore received the M20S-68 bitcoin miner, thus presenting the third-party independent experience evaluation as follows.

Product parameters(default mode)

Brand WhatsMiner
Model M20S WhatsMiner
Algorithm SHA-256
Submodel 68TH/s @ 3300w
Hashrate 68TH/s ± 5%
Power Consumption 3300w ± 10%
Power Supply With PSU, plug & play

Whatsminer M20S appearance

Whatsminer M20S is relatively simple and compact. On the industrial carton is the Whatsminer M20S logo and SN code. Package size 485x230x355mm, 12.3KG.

Custom-made EPE foams and a transparent plastic dust bag inside reinforce the inside to protect the machine during transport.

Whatsminer M20S is equipped with one dedicated 16A 3×1.5mm power cord. (Note: power plug is only 16A jack, power plug is only 16A power cord interface).

Whatsminer M20S has a classic single-tube design, size 390x158x240mm, weight 11.4KG.

On one side of Whatsminer M20S is MicroBT’s latest logo and series mark, and on the other side are the precautions: check before power on, no touch during operation, moisture proof, stable power supply, professional maintenance, etc.

Control board side air inlets and metal shield power interface. Air outlet fans are not equipped with protective shield.

Whatsminer M20S Internal Structure

Due to the single-tube design, it’s convenient to disassemble Whatsminer M20S. Remove the fixing screws around the control board first, then remove the power line and data cable connecting to hashrate board to remove the control board.

Whatsminer M20S and M10 adopt the same interface control boards.

Remove the screws that fix the power supply and the screws on the hashrate board to remove the power supply.

Whatsminer M20S has a new P20-12-3350-V1 power supply model to provide 12V 265A and 12V 12A DC output with a maximum nominal power of 3350W.

Whatsminer P20 uses high-quality materials. As for transformer, it adopts Whatsminer’s traditional dual-voltage mode, divided into upper and lower parts. Two PFCs are responsible for voltage rise with two-stage low-pass, and two LLCs are responsible for voltage drop. LLC has higher efficiency at lower voltage losses.

Whatsminer P20 is software-based with programming interface to control voltage. Despite adopting two inductors and two transformers with higher costs, it can ensure more stable power supply. A 8cm 12V 1.5A cooling fan is installed at the rear of the power supply for ventilation heat dissipation. Instead of blowing air, it adopts the way of air exhaustion to effectively prevent oxidation and intrusion of moisture, so it can also be used in humid mining environments. Also, power supply case thickness is good for heat dissipation.

16A Connector Power

Whatsminer M20S uses two 14cm 12V 9A PFC1412HE-00 fans to dissipate heat by blowing air on one side and exhaust air on the other.

Remove fans, hashrate board, and controller adapter board to remove the hashrate board.

The miner chassis is made of aluminum alloy, inserting and fixing the hashrate board through the grooves inside.

There are three hashrate boards with aluminum heat sinks on both sides. Aluminum heat sink has high density and 26 spring screws fix the two heat sinks.

When removing the heat sink, we can see Whatsminer M20S hashrate chips. Thermal silica gel is added between sinks and chips. Each hashrate board has 105 Samsung 8nm ASIC chips coded KF1920.

The rear aluminum substratum is coated with thermal grease to directly contact the sinks.

Detailed M20S decommissioning

Whatsminer M20S installation and set-up

Before the miner is on, no physical abnormalities such as wire disconnection or abnormal noise must be confirmed. Confirm power socket supports 16A. Connect miner to power cord and network cable once confirmed.

Whatsminer M20S detailed installation and configuration tutorial is introduced in another article. We won’t go into details here.

Whatsminer M20S Standard Mode Test

Currently, the low-power mode was not enabled, so we only conducted the standard 24-hour test.

The environment temperature is about 28℃, the noise value is 50db and the switch-on power consumption is 125W. Since two 9A fans run at full speed of 7200 rpm, the noise has reached 102db.

Whatsminer M20S is in auto frequency stage within 20 minutes. The hashrate varies between 14-19T with power consumption fluctuating between 1100-2500W, fan speed varies between 1000-2200 rpm and noise is as low as 60db. Such a stage will last relatively long after every miner starts. The users may feel confused about it, but it’s normal as a matter of fact.

After about 20 minutes, the hashrate will automatically rise to 68T quickly and calculate the running time from 0. It’s at this moment that the miner starts its normal operation. The measured power consumption is 3340W, the tested close-in noise being 93.7db.

The temperature on the side of the miner is 45.3℃ and on the air outlet is 59℃. The temperature tested at the cooling fan bearing is 66.5℃.

The temperature at the junction of power supply and hashrate board is 37.3℃ and the temperature at the air outlet of power supply is 48.3℃.

After 24 hours of testing, with rising ambient temperature, power consumption will increase slightly. Since the overall power consumption has exceeded 3000W, the wire temperature is also recorded between 36-39℃. The highest temperature 55.3℃ is tested around the power plug.

After 24 hours of testing on Whatsminer M20S, we got the hashrate as follows: the average hashrate on configuration page is about 69T, and the hashrate the btc.com pool receives within 24 hours is 68.3T. The hashrate is stable and the rejection rate is 0, so the power consumption ratio is 48.9W/T.

Summary

After 24 hours of uninterrupted EastShore testing, the average M20S-68T bitcoin miner has reached 68.3T in the pool for 24 hours with 3340W power consumption and 48.9W/T power consumption ratio, consistent with nominal values. Since single-miner power consumption exceeded 3000W, wire and socket load capacity should be considered for deployment in mining farms. Moreover, the mining farm’s ambient temperature will also affect energy consumption, so mining farms should have good heat dissipation. Although the noise is slightly higher than that of previous miners, the noise level for mining farms is sometimes not so important.

Whatsminer M20S controlled the 50W/T power consumption ratio to maximize bitcoin miner’s stand-alone hashrate. As the single miner with the industry’s highest hashrate, Whatsminer series has always maintained their consistent hashrate style.

This content was originally published here.

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