[Mining Machine Review] Unraveling the mystery, Shenma M21S mining machine review

Written by: Jack, Layout by: Bu Er

WeChat Official Account: Blockchain Hardware Alliance

(ID: miner_hardware)

The new product launch conference of BitMicro Miner was held at Chengdu Marriott Hotel on May 19. It is understood that the Shenma M21S mining machine has a computing power of up to 56T and a power consumption ratio as low as 60W/T. The mining machine is scheduled to be shipped in batches in early July. The M21S supports the SHA256 algorithm and has the characteristics of low power consumption, integration, easy heat dissipation, and high computing power.

Recently, we conducted actual testing and confirmation on the Shenma M21S mining machine . The following is our evaluation content .

1

Mining machine introduction

Official website mining machine appearance

Official website introduction:

Official parameters:

2

Mining machine evaluation

Appearance packaging:

There is no logo on the front, the box size is: 478*230*345mm (there are errors in manual measurement)

There is a small label on the side:

Unboxing:

The protective layer inside the box is wrapped in a dustproof bag and an EPE board is added to enhance the vibration reduction effect. The EPE board is customized to fit the main body and comes with a power cord.

The power cord uses an international 300/500V 3-core*1.5mm wire diameter, which is significantly thicker than the more common 3*0.75 international wire on the market. ( A 16A socket is required )

Machine physical picture:

The power board is integrated with the mining machine, and the fans are arranged side by side for air intake. The air inlet is as follows:

Air outlet: fan exhaust

Front and side

Close-up details

Mining pool and mining machine settings :

A: Find the mining machine IP: After the power is supplied, the mining machine starts to start. After the green light of the mining machine starts to flash, find the mining machine IP, open the software, select the "Detect IP" tab, set the room number, rack number, layer number on the rack, and position number of the layer where the mining machine is located, click "Start", and then press the IP button on the mining machine. The computer will feedback the mining machine IP.

B: After finding the IP of the mining machine, enter the obtained IP address in the web page, enter the username and password, log in, and enter the Cgminer configuration page. In the Cgminer configuration interface, modify the mining pool address and miner name. After modification, click "Save & Apply" in the lower right corner to save the modified configuration.

C: Modify the IP address (applicable to the management of large-scale mining machines in mining factories, and can be skipped for a small number of mining machines)

Click on the upper menu bar

"Configuration/Interfaces" enters the mining software IP address setting interface, click "Edit" to set the IP address to a fixed IP. After the project modification is completed, click "Status/CGMiner Status" in the upper menu bar to return to the home page.

The ambient temperature of the general mode test is 26.4 degrees Celsius and the noise level is 46.7dB ( the machine's air outlet is facing the outdoors )

The machine enters the general working mode and restarts. The background information is:

30 minutes after power-on:

The computing power of the whole machine is 58.8T, the power consumption of the machine is 3639W, the air outlet noise is 98.7dB, and the air outlet temperature is 67.9 degrees Celsius.

The computing power of the computing boards are: 18.7T, 20.1T, and 20.1T respectively.

The maximum PCB temperatures are 71, 70.5, and 72.5 respectively.

The fan speeds are: 4980 rpm and 4980 rpm respectively.

Power on for 1 hour:

The computing power of the whole machine is 58.8T, the power consumption of the machine is 3646W, the air outlet noise is 99.4dB, and the air outlet temperature is 66 degrees Celsius.

Power on for 2 hours:

The computing power of the whole machine is 58.8T, the power consumption of the machine is 3652W, the air outlet noise is 99.6dB, and the air outlet temperature is 65.1 degrees Celsius.

The computing power of the computing boards are: 18.6T, 20.0T, and 20.1T respectively.

The maximum PCB temperatures are 71, 71, and 72.5 respectively.

The fan speeds are 4980 rpm and 4950 rpm respectively.

Power on for 3 hours:

The computing power of the whole machine is 58.7T, the power consumption of the machine is 3668W, the air outlet noise is 99.4dB, and the air outlet temperature is 63.6 degrees Celsius.

Power on for 4 hours:

The computing power of the whole machine is 58.7T, the power consumption of the machine is 3657W, the air outlet noise is 99.1dB, and the air outlet temperature is 64.7 degrees Celsius.

The computing power of the computing boards are: 18.5T, 20.1T, and 20.1T respectively.

The maximum PCB temperatures are 70.5, 71, and 73 respectively.

The fan speeds are: 5280 rpm and 5280 rpm respectively.

Working current: 16.51A

Power consumption: 15.36 degrees

Detailed appearance of the mining machine

Control board and external connections:

Connection between power board and hash board:

3

PCBA Analysis and Evaluation

Machine interior diagram:

Take out the middle hash board:

Take out the hash board, and the air duct of the mining machine is as follows:

The installation direction of the hash board M21S is as shown in the figure:

The distance between the air inlet and the air outlet of the M21S mining machine is 305mm:

The following is a picture of the Whatsma M21S hashboard. The hashboard is 303mm long, has two heat sinks, and has high wind resistance:

Control panel installation diagram:

After removing the heat sink

Front view:

Reverse:

PCBA version: CB4_V2

PCBA SIZE: 104.5mm*74mm (manual measurement may result in errors)

Close-up of details (NAND FLASH, DDR, PMIC, main control):

The M21S control board uses the Allwinner Technology H6 chip as the main control. The H6 is an ARM quad-core A53 CPU, with a MaliT720 GPU, supporting OpenGL3.1, DDR4, and EMMC5.0. The chip performance is 77% higher than the previous generation; decoding supports 4K@60fps, and the highest resolution can reach 6K (5780×2890); supports HDR10, HLG, and integrates the Allwinner Smartcolor3.0 intelligent image quality engine.

Chip block diagram:

Basic specifications:

Important components of the control panel:

A single mining machine has 3 hash boards

Power supply and hash board connection part:

Front of the hashboard:

The reverse side of the hash board:

Side of the heat sink of the hash board:

After removing the heat sink of the hash board

Front view of the hashboard:

Heat sink and nut pictures:

Connection between hash board and adapter board:

Adapter board part

Front view of the adapter board:

Back view of the adapter board:

Power connection part

Copper bars connecting the power board and the hash board:

There are two types of hashing chips in the three M21S hashing boards. The following is a comparison of the two hashing boards. The circuit layout is basically the same:

From the barcode suffixes on the edge of the board, we can see that there are two types, KF1921 and KF1922, corresponding to different hashing boards:

Hash power chips: KF1922 and KF1991, single hash power board 66PCS, single mining machine: 66*3 (hash power board) = 198PCS

Some important device models: SN74LVC1T45, LM75A

Power Board

The power board is embedded in the upper part of the mining machine, front view:

side view:

parameter:

Output: 12V-12A and 12V-265A.

Power input side:

Output side: (The output is connected to the hash board through a copper bar)

Power supply fan:

EMI, PFC circuit:

The power board is divided into two parts

Front of the power board:

Back side of power board:

Power master control:

Detail close-up, output end:

PFC capacitor:

Machine:

4

Summarize

When the Shenma M21S mining machine is working, the power of the whole machine will exceed 3600W. The power cord configured by the original factory tends to get hot when working, so it is recommended to replace it. In addition, the mining machine computing board uses two chips (KF1921/KF1922), which is very rare in previous mining machines.