MSI MAG B550 TOMAHAWK MAX WIFI User Manual

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

Fan connectors can be classified as PWM (Pulse Width Modulation) Mode or DC Mode.
PWM Mode fan connectors provide constant 12V output and adjust fan speed with
speed control signal. DC Mode fan connectors control fan speed by changing voltage.
The auto mode fan connectors can automatically detect PWM and DC mode. However,
you can follow the instruction below to adjust the fan connector to PWM or DC Mode
manually.

You can switch between PWM mode and DC mode and adjust fan speed in BIOS >
HARDWARE MONITOR.
Select PWM mode or  mode

Important
Make sure fans are working properly after switching the PWM/ DC mode.
There are gradient points of the fan speed that allow you to adjust
fan speed in relation to CPU temperature.
Pin definition of fan connectors
CPU_FAN1
SYS_FAN5 SYS_FAN4
SYS_FAN3
PUMP_FAN1
SYS_FAN1
SYS_FAN6
SYS_FAN2

Default fan
mode
Max.
current
Max.

CPU_FAN1 Auto mode 2A 24W
PUMP_FAN1 PWM mode 3A 36W
SYS_FAN1~6 DC mode 1A 12W
1
PWM Mode pin definition
1 Ground 2 +12V
3 Sense 4 Speed Control Signal
1

1 Ground 2 Voltage Control
3 Sense 4 NC

MSI MAG B550 TOMAHAWK MAX WIFI Specifications

General

Processor socket	Socket AM4
Processor manufacturer	AMD
Compatible processor series	AMD Ryzen 3 3rd Gen, AMD Ryzen 5, AMD Ryzen 5 5th Gen, AMD Ryzen 7 3rd Gen, AMD Ryzen 7 5th Gen, AMD Ryzen 9 5th Gen
Audio chip	Realtek ALC897
Component for	PC
Motherboard chipset	AMD B550
Audio output channels	7.1 channels
Motherboard form factor	ATX
Windows operating systems supported	Windows 10 x64, Windows 11 x64
Non-ECC	Yes
Memory channels	Dual-channel
Memory slots type	DIMM
Number of memory slots	4
Supported memory types	DDR4-SDRAM
Maximum internal memory	128 GB
Supported memory clock speeds	2133, 2400, 2666, 2933, 3000, 3200, 3300, 3333, 3400, 3466, 3600, 3733, 3866, 4000, 4133, 4200, 4266, 4300, 4400, 4533, 4600, 4800, 4866, 5000, 5100 MHz
Supported memory clock speed (max)	5100 MHz
Number of SATA III connectors	6
USB 3.2 Gen 1 (3.1 Gen 1) connectors	3
USB 3.2 Gen 2 (3.1 Gen 2) connectors	-
Peripheral (Molex) power connectors (4-pin)	1
Number of M.2 (M) slots	2
RAID levels	0, 1, 10
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
Digital audio optical out	5
LAN controller	Realtek RTL8125B
Wi-Fi standards	802.11a, 802.11b, 802.11g, Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac), Wi-Fi 6 (802.11ax), Wi-Fi 6E (802.11ax)
Bluetooth version	5.2
Top Wi-Fi standard	Wi-Fi 6E (802.11ax)
Ethernet interface type	2.5 Gigabit Ethernet
DirectX version	12.0
Parallel processing technology support	Crossfire

Weight and Dimensions

Depth	305 mm
Width	244 mm