Antminer control boards and hash boards

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Antminer control boards and hash boards

Which platform your miner control board runs on, how many chips sit on one hash board and which board revisions exist. A table covering 47 models, put together from our own machines and from the ones that came through the workshop.

01What a control board is

A miner holds two different kinds of electronics. The hash boards do the counting, the control board runs them: it keeps the network up, serves the web panel, watches temperature and hands out work. It is a small single board computer built around one of four processors.

Platform	Full name	What sets it apart
aml	Amlogic	Fitted to the newer models. Fast boot, firmware over SD card or straight into memory.
xil	Xilinx	The long running workhorse of the S19 series, also found in X21 hydro machines.
cv	CVitek	Came in to replace boards that were in short supply, often shipped as an alternative on the same model.
bb	BeagleBone	The earliest S19 series boards. Rarely seen now.

Knowing the platform matters for three reasons. Buying firmware: an Amlogic file will not load on Xilinx. Repair: a replacement board is picked by platform, not by miner name. Buying a used miner: the same model can carry any of the boards listed in the table.

02How to find out your platform

Look at the board itself. The marking is printed on the PCB and the processor is visible right there.
Open the miner web panel and find the system version section. The firmware line usually names the platform.
Check against the table below. If the model has one platform, that settles it. If it has several, you will have to look with your own eyes.

Careful with used machinesControl boards get swapped during repairs, so the one inside may not be the one that left the factory. Go by what is fitted now, not by the year of manufacture.

03Hash board revisions

A number such as BHB68603 is the hash board revision. Bitmain builds the same miner model with different boards: the layout changes, the power scheme changes, sometimes the chip placement too. From the outside the machines look identical.

For a buyer this matters in one case: ordering spare parts. A replacement board is matched by revision, not by miner model. The revision is printed on the board itself, usually near the edge.

The table below lists the revisions we have come across. The list is open ended: Bitmain keeps adding new ones.

04How many chips a miner has

The table gives the chip count per hash board, not per miner. To get the total, multiply by the number of boards. Air cooled Antminers usually have three.

Model	Chips per board	Boards	Total chips
Antminer S21	108	3	324
Antminer L9	110	3	330
Antminer L7	120	3	360

The domain column is the number of power groups on a board. Chips inside a domain are powered in series, so when one domain fails the whole group drops out. That is why a fault looks the way it does: the hashrate does not lose a single chip, it loses a noticeable share.

05Model table

Columns: cooling, control board platform, chips per hash board, power domains per board, known board revisions.

X21 series

Model	Cooling	Platform	Chips per board	Domains	Hash board revisions
Antminer S21	Air	aml	108	12	BHB68603-/BHB68603/BHB68606/HB68606P/HB68603P
Antminer S21 Hydro	Hydro	xil	216	18	HHB68501/HHB68502/HHB68503/HHB68601
Antminer S21 Imm	Immersion	aml	156	13	IHB68601
Antminer S21 Pro	Air	aml	65	13	A3HB70602/A3HB70601/A3HB70603
Antminer S21 Pro+	Air	aml	65	13	n/d
Antminer S21 XP	Air	aml	91	13	A3HB70501/A3HB70502/A3HB70503
Antminer S21 XP Hydro	Hydro	xil	160	20	H6HB70501/H6HB70502
Antminer S21 XP Imm	Immersion	aml	91	13	M1HB70601/M1HB70602
Antminer S21+	Air	aml	55	11	A3HB70701/A3HB70703/A3HB70702
Antminer S21+ Hydro	Hydro	cv,xil	95	19	H6HB70701/H6HB70702/H6HB70704
Antminer S21++	Air	aml	55	11	A3HB70705
Antminer S21e Hydro	Hydro	aml,xil	85	17	H6HB70802/H6HB70801
Antminer S21e XP Hydro	Hydro	xil	160	20	H6HB70802/H6HB70601
Antminer T21	Air	aml,cv,xil	108	12	BHB68701/BHB68703
Antminer U3S21EXPH	Hydro	xil	160	20	H1HB70602/H1HB70604

X19 series

Model	Cooling	Platform	Chips per board	Domains	Hash board revisions
Antminer S19	Air	xil	76	38	NBS1902
Antminer S19 (126)	Air	aml,bb,cv,xil	126	42	BHB42841
Antminer S19 (88)	Air	aml,bb,cv,xil	88	44	BHB42801/42801/BHB42821/BHB42831
Antminer S19 Hydro	Hydro	xil	104	52	HHB28601
Antminer S19 Pro	Air	xil	114	38	NBP1901
Antminer S19 Pro Hydro	Hydro	xil	180	60	HHB42602/HHB42701
Antminer S19 Pro Hydro (120)	Hydro	aml,bb,xil	120	60	HHBXXX/BHB30601
Antminer S19 Pro+ Hydro	Hydro	xil	180	60	BHBXXXXX/HHB42631
Antminer S19 Pro-A	Air	aml,bb,xil	114	38	BHBXXXX
Antminer S19 XP	Air	aml,cv,xil	110	11	BHB56701/BHB56801/BHB56802/BHB56806
Antminer S19 XP Hydro	Hydro	xil	204	17	HHB56601
Antminer S19 XP+	Air	aml	108	12	BHB68707/BHB68709
Antminer S19 XP+ Hydro	Hydro	xil	180	18	HHB68701
Antminer S19+	Air	xil	80	10	BHB28701
Antminer S19a	Air	xil	72	9	BHB28611
Antminer S19a Pro	Air	xil	100	10	BHB28501
Antminer S19e XP Hydro	Hydro	aml,cv	204	17	H6HB56702
Antminer S19i	Air	xil	80	40	NBS2003
Antminer S19j	Air	bb,cv,xil	108	36	BHB42701
Antminer S19j Pro	Air	aml,bb,cv,xil	126	42	BHB42601/BHB42603/BHB42621/BHB42631/BHB42641/BHB42651
Antminer S19j Pro+	Air	aml,bb,cv,xil	120	40	BHB42612
Antminer S19j Pro-A	Air	aml,bb,cv,xil	126	42	BHB42601
Antminer S19j XP	Air	aml,cv,xil	110	11	BHB56804/BHB56804-
Antminer S19j+	Air	aml,bb,cv,xil	108	36	BHB42701
Antminer S19k Pro	Air	aml,cv,xil	77	11	BHB56902-/BHB56902/BHB56903-/BHB56903/BHB56907
Antminer T19	Air	xil	76	38	NBT1903
Antminer T19 Hydro	Hydro	xil	104	52	HHB28602
Antminer T19 Pro Hydro	Hydro	xil	204	17	HHB56702
Antminer U3S19XP+H	Hydro	cv,xil	180	18	H1HB68601

L series, Scrypt

Model	Cooling	Platform	Chips per board	Domains	Hash board revisions
Antminer L7	Air	xil	120	24	BSL39601
Antminer L9	Air	aml,cv	110	22	BSL41601
Antminer U2L9H	Hydro	aml	170	34	A5SL41701

06Frequently asked questions

Can a control board be swapped for a different platform?

The connectors do not always line up, and the firmware is definitely a different one. In practice a board is replaced with the same platform, otherwise you have to work out both the file and the settings again.

Why does one model have several platforms?

Bitmain built batches on different processors because of component shortages. Model, year and even serial number do not settle it, you have to look at the board.

What do the letters in a revision number mean?

The first part encodes board type and family. Boards with H are usually hydro, with I immersion, with A the air cooled newer series. Bitmain does not publish the full breakdown.

How many chips does my miner have in total?

Multiply the figure from the table by the number of hash boards. Air cooled models have three, hydro and immersion can differ: check the status section of the web panel, it shows the number of chains.

Is the data in the table accurate?

These are our own observations from machines we have serviced. Bitmain does not publish this information, so the list keeps growing. If your revision is missing, write to us.