Asus PRIME B550M-A WIFI II-CSM Manuel utilisateur

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Motherboard
PRIME B550M-A WIFI II
ii
E22625
Revised Edition v2
September 2023
Copyright © 2023 ASUSTeK COMPUTER INC. All Rights Reserved.
No part of this manual, including the products and software described in it, may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into any language in any form or by any
means, except documentation kept by the purchaser for backup purposes, without the express written
permission of ASUSTeK COMPUTER INC. (“ASUS”).
Product warranty or service will not be extended if: (1) the product is repaired, modied or altered, unless
such repair, modication of alteration is authorized in writing by ASUS; or (2) the serial number of the
product is defaced or missing.
ASUS PROVIDES THIS MANUAL “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OR CONDITIONS OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL ASUS, ITS
DIRECTORS, OFFICERS, EMPLOYEES OR AGENTS BE LIABLE FOR ANY INDIRECT, SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF PROFITS,
LOSS OF BUSINESS, LOSS OF USE OR DATA, INTERRUPTION OF BUSINESS AND THE LIKE),
EVEN IF ASUS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES ARISING FROM ANY
DEFECT OR ERROR IN THIS MANUAL OR PRODUCT.
SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUAL ARE FURNISHED FOR
INFORMATIONAL USE ONLY, AND ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE,
AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY ASUS. ASUS ASSUMES NO
RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR INACCURACIES THAT MAY APPEAR IN THIS
MANUAL, INCLUDING THE PRODUCTS AND SOFTWARE DESCRIBED IN IT.
Products and corporate names appearing in this manual may or may not be registered trademarks or
copyrights of their respective companies, and are used only for identication or explanation and to the
owners’ benet, without intent to infringe.
iii
Contents
Safety information ...................................................................................................... iv
About this guide .......................................................................................................... v
Package contents ....................................................................................................... vi
PRIME B550M-A WIFI II specifications summary .................................................... vi
Chapter 1 Product Introduction
1.1 Before you proceed ......................................................................................1-1
1.2 Motherboard overview .................................................................................1-1
1.3 Central Processing Unit (CPU) ....................................................................1-8
1.4 System memory ............................................................................................1-9
Chapter 2 BIOS and RAID Support
2.1 Knowing BIOS ...............................................................................................2-1
2.2 BIOS Setup program ....................................................................................2-2
2.3 ASUS EZ Flash 3 ...........................................................................................2-3
2.4 ASUS CrashFree BIOS 3 .............................................................................. 2-4
2.5 RAID configurations .....................................................................................2-5
Appendix
Notices ..................................................................................................................... A-1
Warranty ................................................................................................................... A-8
ASUS contact information .................................................................................... A-10
Service and Support ............................................................................................. A-10
iv
Safety information
Electrical safety
• To prevent electrical shock hazard, disconnect the power cable from the electrical outlet
before relocating the system.
• When adding or removing devices to or from the system, ensure that the power cables
for the devices are unplugged before the signal cables are connected. If possible,
disconnect all power cables from the existing system before you add a device.
• Before connecting or removing signal cables from the motherboard, ensure that all power
cables are unplugged.
• Seek professional assistance before using an adapter or extension cord. These devices
could interrupt the grounding circuit.
• Ensure that your power supply is set to the correct voltage in your area. If you are not
sure about the voltage of the electrical outlet you are using, contact your local power
company.
• If the power supply is broken, do not try to x it by yourself. Contact a qualied service
technician or your retailer.
Operation safety
• Before installing the motherboard and adding components, carefully read all the manuals
that came with the package.
• Before using the product, ensure all cables are correctly connected and the power cables
are not damaged. If you detect any damage, contact your dealer immediately.
• To avoid short circuits, keep paper clips, screws, and staples away from connectors,
slots, sockets and circuitry.
• Avoid dust, humidity, and temperature extremes. Do not place the product in any area
where it may become wet.
• Place the product on a stable surface.
• If you encounter technical problems with the product, contact a qualied service
technician or your retailer.
• Your motherboard should only be used in environments with ambient temperatures
between 0°C and 40°C.
Button/Coin Batteries Safety Information
WARNING
KEEP OUT OF REACH OF CHILDREN
Swallowing can lead to chemical burns,
perforation of soft tissue, and death.
Severe burns can occur within 2 hours
of ingestion. Seek medical attention
immediately.
v
About this guide
This user guide contains the information you need when installing and conguring the
motherboard.
How this guide is organized
This guide contains the following parts:
• Chapter 1: Product Introduction
This chapter describes the features of the motherboard and the new technology it
supports. It includes descriptions of the switches, jumpers, and connectors on the
motherboard.
• Chapter 2: BIOS and RAID Support
This chapter tells how to boot into the BIOS, upgrade BIOS using the EZ Flash Utility
and support on RAID.
Where to find more information
Refer to the following sources for additional information and for product and software
updates.
1. ASUS website
The ASUS website (www.asus.com) provides updated information on ASUS hardware
and software products.
2. Optional documentation
Your product package may include optional documentation, such as warranty flyers,
that may have been added by your dealer. These documents are not part of the
standard package.
Conventions used in this guide
To ensure that you perform certain tasks properly, take note of the following symbols used
throughout this user guide.
CAUTION: Information to prevent damage to the components and injuries to
yourself when trying to complete a task.
IMPORTANT: Instructions that you MUST follow to complete a task.
NOTE: Tips and additional information to help you complete a task.
vi
Package contents
Check your motherboard package for the following items.
Motherboard 1 x PRIME B550M-A WIFI II motherboard
Cables 2 x SATA 6Gb/s cables
Miscellaneous
1 x I/O Shield
1 x M.2 SSD screw package
1 x ASUS Wi-Fi moving antennas
Application DVD 1 x Support DVD
Documentation 1 x User manual
If any of the above items is damaged or missing, contact your retailer.
PRIME B550M-A WIFI II specifications summary
CPU
AMD Socket AM4 for AMD Ryzen™ 5000 Series / 5000 G-Series / 4000
G-Series / 3000 Series Desktop Processors*
*Refer to www.asus.com for CPU support list.
Chipset AMD B550 Chipset
Memory
4 x DIMM, Max. 128GB, DDR4 4866(OC)/4800(OC)/4600(OC)/4466(OC)/
4400(OC)/4333(OC)/4266(OC)/4200(OC)/4133(OC)/4000(OC)/3866(OC)/
3733(OC)/3600(OC)/3466(OC)/3400(OC)/3333(OC)/3200/3000/2933/2800/
2666/2400/2133, Un-buffered Memory*
Dual Channel Memory Architecture
* ECC memory(ECC mode) support varies by CPU.
* Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists), and memory
frequency support depends on the CPU types.
Graphics
1 x D-Sub port
1 x DVI-D port
1 x HDMI® port**
* Graphics specifications may vary between CPU types.
** Support 4K@60Hz as specified in HDMI® 2.1.
Expansion Slots
AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors
1 x PCIe 4.0 x16 slot (supports x16 mode)
AMD Ryzen™ 5000 G-Series / 4000 G-Series Desktop Processors
1 x PCIe 3.0 x16 slot (supports x16 mode)
AMD B550 Chipset
2 x PCIe 3.0 x1 slots
Storage
Total supports 2 x M.2 slots and 4 x SATA 6Gb/s ports
AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors
M.2_1 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 4.0 x4 & SATA
modes)
AMD Ryzen™ 5000 G-Series / 4000 G-Series Desktop Processors
M.2_1 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 3.0 x4 & SATA
modes)
AMD B550 Chipset
M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 3.0 x4 & SATA modes)
4 x SATA 6Gb/s ports
Supports RAID 0, 1, 10
(continued on the next page)
vii
PRIME B550M-A WIFI II specifications summary
Ethernet 1 x Realtek 1Gb Ethernet
Wireless &
Bluetooth
Wi-Fi 6
2x2 Wi-Fi 6 (802.11 a/b/g/n/ac/ax)
Supports 2.4/5GHz frequency band
Bluetooth v5.2
USB
Rear USB (Total 6 ports)
2 x USB 3.2 Gen 2 ports (2 x Type-A)
4 x USB 3.2 Gen 1 ports (4 x Type-A)
Front USB (Total 6 ports)
1 x USB 3.2 Gen 1 header supports additional 2 USB 3.2 Gen 1 ports
2 x USB 2.0 headers support additional 4 USB 2.0 ports
Audio
Realtek 7.1 Surround Sound High Denition Audio CODEC*
- Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking
- Supports up to 24-Bit/192kHz playback
Audio Features
- Audio Shielding
- LED-illuminated audio trace path design
- Premium audio capacitors
- Dedicated audio PCB layers
* A chassis with an HD audio module in the front panel is required to support 7.1
Surround Sound audio output.
Back Panel I/O Ports
2 x USB 3.2 Gen 2 ports (2 x Type-A)
4 x USB 3.2 Gen 1 ports (4 x Type-A)
1 x D-Sub port
1 x DVI-D port
1 x HDMI® port
1 x Wi-Fi Module
1 x Realtek 1Gb Ethernet port
3 x Audio jacks
1 x PS/2 Keyboard/Mouse combo port
Internal I/O
Connectors
Fan and Cooling related
1 x 4-pin CPU Fan header
1 x 4-pin CPU OPT Fan header
2 x 4-pin Chassis Fan headers
Power related
1 x 24-pin Main Power connector
1 x 8-pin +12V Power connector
Storage related
2 x M.2 slots (Key M)
4 x SATA 6Gb/s ports
USB
1 x USB 3.2 Gen 1 header supports additional 2 USB 3.2 Gen 1 ports
2 x USB 2.0 headers support additional 4 USB 2.0 ports
(continued on the next page)
viii
PRIME B550M-A WIFI II specifications summary
Internal I/O
Connectors
Miscellaneous
1 x Addressable Gen 2 header
2 x AURA RGB headers
1 x Clear CMOS header
1 x COM Port header
1 x Front Panel Audio header (AAFP)
1 x S/PDIF Out header
1 x Speaker header
1 x SPI TPM header (14-1 pin)
1 x 10-1 pin System Panel header
Special Features
ASUS 5X PROTECTION III
- DIGI+ VRM
- LANGuard
- Overvoltage Protection
- SafeSlot Core
- Stainless-Steel Back I/O
ASUS Q-Design
- Q-DIMM
- Q-Slot
ASUS Thermal Solution
- VRM heatsink design
AURA Sync
- AURA RGB headers
- Addressable Gen 2 header
Software
Features
ASUS Exclusive Software
Armoury Crate
- AURA Creator
- AURA Sync
AI Suite 3
- Performance and Power Saving Utility
TurboV EVO
EPU
DIGI+ VRM
Fan Xpert 2+
- EZ update
- Lighting Control
ASUS CPU-Z
AI Charger
DAEMON Tools
MyASUS
Norton Anti-virus software (Free Trial version)
WinRAR
UEFI BIOS
ASUS EZ DIY
- ASUS CrashFree BIOS 3
- ASUS EZ Flash 3
- ASUS UEFI BIOS EZ Mode
(continued on the next page)
ix
PRIME B550M-A WIFI II specifications summary
BIOS 256 Mb Flash ROM, UEFI AMI BIOS
Manageability WOL by PME, PXE
Operating System Windows® 11 64-bit
Windows® 10 64-bit
Form Factor mATX Form Factor
9.6 inch x 9.6 inch (24.4 cm x 24.4 cm)
• Specications are subject to change without notice. Refer to
the ASUS website for the latest specications.
• MyASUS offers a variety of support features such as helping
to troubleshoot issues, optimizing product performance,
integrating ASUS software, and recovery drive creation.
Please scan the QR Code for installation guide and FAQ.
x
1-1
Product Introduction
1.1 Before you proceed
Take note of the following precautions before you install motherboard components or change
any motherboard settings.
• Unplug the power cord from the wall socket before touching any component.
• Before handling components, use a grounded wrist strap or touch a safely grounded
object or a metal object, such as the power supply case, to avoid damaging them due
to static electricity.
• Before you install or remove any component, ensure that the ATX power supply is
switched off or the power cord is detached from the power supply. Failure to do so
may cause severe damage to the motherboard, peripherals, or components.
Unplug the power cord before installing or removing the motherboard. Failure to do so can
cause you physical injury and damage motherboard components.
The pin denitions are for reference only and are subject to change.
1.2 Motherboard overview
Place this
side towards
the rear of the
chassis
DDR4 DIMM_A1 (64bit, 288-pin module)
DDR4 DIMM_A2* (64bit, 288-pin module)
DDR4 DIMM_B1 (64bit, 288-pin module)
DDR4 DIMM_B2* (64bit, 288-pin module)
DIGI+
VRM
CHA_FAN2
CPU_FAN
CPU_OPT
COM_DEBUG
AURA
CHA_FAN1
TPM
RGB_HEADER2
RGB_HEADER1
ADD_GEN 2
SPEAKER
F_PANEL
AAFP
SPDIF_OUT
SATA6G_4
CLRTC
SATA6G_3 SATA6G_2 SATA6G_1
256Mb
BIOS
EATX12V
EATXPWR
U32G1_12
BATTERY
U32G2_56
LAN_U32G1_34
KBMS
_U32G1
_78
DVI
VGA
HDMI
AUDIO
M.2(WIFI)
Super
I/O
PCIEX1_1
PCIEX1_2
M.2_1(SOCKET3)
M.2_2(SOCKET3)
22110
2260 2242
2280 2260 2242
PCIEX16
USB34USB12
COM
24.4cm(9.6in)
24.4cm(9.6in)
SOCKET AM4
2280
AMD
B550
Ethernet
Audio
Codec
8
12
6
5
10 11 4131415
3
5 118 24 4
717169
11
1
ASUS PRIME B550M-A WIFI II
Chapter 1: Product Introduction
1-2
1.2.1 Layout contents
1. CPU socket
The motherboard comes with an AMD Socket AM4 designed for AMD Ryzen™ 5000 Series /
5000 G-Series/ 4000 G-Series/ 3000 Series Desktop Processors.
For more details, refer to Central Processing Unit (CPU).
2. DDR4 DIMM slots
The motherboard comes with Dual Inline Memory Modules (DIMM) slots designed for DDR4
(Double Data Rate 4) memory modules.
For more details, refer to System memory.
3. Expansion slots
This motherboard supports one PCIe x16 graphics card and two PCIe 3.0 x1 network cards,
SCSI cards and other cards that comply with the PCI Express specication.
• AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors
1 x PCIe 4.0 x16 slot (supports x16 mode)
• AMD Ryzen™ 5000 G-Series / 4000 G-Series Desktop Processors
1 x PCIe 3.0 x16 slot (supports x16 mode)
4. Fan headers
The Fan headers allow you to connect fans to cool the system.
5. Power connectors
These Power connectors allow you to connect your motherboard to
a power supply. The power supply plugs are designed to t in only one orientation. Find the
proper orientation and push down rmly until the power supply plugs are fully inserted.
Ensure to connect the 8-pin power plug.
• For a fully congured system, we recommend that you use a power supply unit
(PSU) that complies with ATX 12V Specication 2.0 (or later version) and provides a
minimum power of 350W.
• We recommend that you use a PSU with a higher power output when conguring a
system with more power-consuming devices. The system may become unstable or
may not boot up if the power is inadequate.
• If you are uncertain about the minimum power supply requirement for your system, we
recommend you to refer to online resources for Power Supply Wattage Calculator.
6. M.2 slots (Key M)
The M.2 slots allow you to install M.2 devices such as M.2 SSD modules.
FAN PWM
FAN IN
FAN PWR
GND
FAN PWM
FAN IN
FAN PWR
GND
Chapter 1: Product Introduction
1-3
• AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors
M.2_1 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 4.0 x4 & SATA
modes)
• AMD Ryzen™ 5000 G-Series / 4000 G-Series Desktop Processors
M.2_1 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 3.0 x4 & SATA
modes)
• AMD B550 Chipset
M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 3.0 x4 & SATA modes)
7. SATA 6Gb/s ports
The SATA 6Gb/s ports allow you to connect SATA devices such as optical disc drives and
hard disk drives via SATA cables.
8. USB 3.2 Gen 1 header
The USB 3.2 Gen 1 header allows you to connect a USB 3.2 Gen 1
module for additional USB 3.2 Gen 1 ports. The USB 3.2 Gen 1 header
provides data transfer speeds of up to 5 Gb/s.
The USB 3.2 Gen 1 module is purchased separately.
9. USB 2.0 headers
The USB 2.0 headers allow you to connect USB modules for additional USB
2.0 ports. The USB 2.0 headers provide data transfer speeds of up to 480
Mb/s.
DO NOT connect a 1394 cable to the USB connectors. Doing so will
damage the motherboard!
The USB 2.0 module is purchased separately.
10. Addressable Gen 2 header
The Addressable Gen 2 header allows you to connect individually
addressable RGB WS2812B LED strips or WS2812B based LED strips.
The Addressable Gen 2 header supports WS2812B addressable RGB
LED strips (5V/Data/Ground), with a maximum power rating of 3A (5V)
and the addressable headers on this board can handle a combined
maximum of 500 LEDs.
Before you install or remove any component, ensure that the power supply is switched off
or the power cord is detached from the power supply. Failure to do so may cause severe
damage to the motherboard, peripherals, or components.
• Actual lighting and color will vary with LED strip.
• If your LED strip does not light up, check if the addressable RGB LED strip is
connected in the correct orientation, and the 5V connector is aligned with the 5V
header on the motherboard.
• The addressable RGB LED strip will only light up when the system is powered on.
• The addressable RGB LED strip is purchased separately.
USB3+5V
IntA_P1_SSRX-
IntA_P1_SSRX+
GND
IntA_P1_SSTX-
IntA_P1_SSTX+
GND
IntA_P1_D-
IntA_P1_D+
GND
PIN 1
USB3+5V
IntA_P2_SSRX-
IntA_P2_SSRX+
GND
IntA_P2_SSTX-
IntA_P2_SSTX+
GND
IntA_P2_D-
IntA_P2_D+
PIN 1
USB+5V
USB_P1-
USB_P1+
GND
NC
USB+5V
USB_P2-
USB_P2+
GND
ADD_GEN 2
ASUS PRIME B550M-A WIFI II
1-4
11. AURA RGB headers
The RGB headers allow you to connect RGB LED strips.
The RGB headers support 5050 RGB multi-color LED strips (12V/G/R/B), with a maximum
power rating of 3A (12V), and no longer than 3m.
Before you install or remove any component, ensure that the ATX power supply is switched
off or the power cord is detached from the power supply. Failure to do so may cause severe
damage to the motherboard, peripherals, or components.
• Actual lighting and color will vary with LED strip.
• If your LED strip does not light up, check if the RGB LED extension cable and the
RGB LED strip are connected in the correct orientation, and the 12V connector is
aligned with the 12V header on the motherboard.
• The LED strip will only light up when the system is powered on.
• The LED strip is purchased separately.
12. Clear CMOS header
This header allows you to clear the CMOS RTC RAM data of the system setup
information such as date, time, and system passwords.
To erase the RTC RAM:
1. Turn OFF the computer and unplug the power cord.
2. Use a metal object such as a screwdriver to short the two pins.
3. Plug the power cord and turn ON the computer.
4. Hold down the <Del> key during the boot process and enter BIOS setup to re-
enter data.
If the steps above do not help, remove the onboard battery and short the two pins again to
clear the CMOS RTC RAM data. After clearing the CMOS, reinstall the battery.
13. COM Port header
This header is for a serial (COM) port. Connect the serial port module cable to
this header, then install the module to a slot opening at the back of the system
chassis.
14. Front Panel Audio header
This header is for a chassis-mounted front panel audio I/O module that
supports HD audio standard. Connect one end of the front panel audio
I/O module cable to this header.
We recommend that you connect a high-denition front panel audio
module to this header to avail of the motherboard’s high-denition
audio capability.
CLRTC
+3V_BAT
GND
PIN 1
PIN 1
COM
DCD
TXD
GND
RTS
RI
RXD
DTR
DSR
CTS
AAFP
AGND
NC
SENSE1_RETUR
SENSE2_RETUR
PORT1 L
PORT1 R
PORT2 R
SENSE_SEND
PORT2 L
HD-audio-compliant
pin definition
Chapter 1: Product Introduction
1-5
15. S/PDIF Out header
This header is for an additional Sony/Philips Digital Interface (S/PDIF) port.
Connect the S/PDIF Out module cable to this header, then install the module to
a slot opening at the back of the system chassis.
16. Speaker header
The 4-pin header is for the chassis-mounted system warning speaker. The
speaker allows you to hear system beeps and warnings.
17. 10-1 pin System Panel header
This header supports several chassis-mounted functions.
• System power LED (2-pin +PWR_LED-)
This 2-pin header is for the system power LED. Connect the chassis
power LED cable to this header. The system power LED lights up when
you turn on the system power, and blinks when the system is in sleep
mode.
• Hard disk drive activity LED (2-pin +HDD_LED-)
This 2-pin header is for the HDD Activity LED. Connect the HDD Activity LED cable to
this header. The HDD LED lights up or flashes when data is read from or written to the
HDD.
• Power button/Soft-off button (2-pin PWR_BTN)
This header is for the system power button.
• Reset button (2-pin RESET)
This 2-pin header is for the chassis-mounted reset button for system reboot without
turning off the system power.
18. SPI TPM header
This header supports a Trusted Platform Module (TPM)
system with a Serial Peripheral Interface (SPI), allowing you
to securely store keys, digital certicates, passwords, and
data. A TPM system also helps enhance network security,
protects digital identities, and ensures platform integrity.
The SPI TPM module is purchased separately.
SPDIF_OUT
+5V
SPDIFOUT
GND
+5V
GND
GND
Speaker Out
SPEAKER
PIN 1
PIN 1
PWR_BTN
PWR_LED+
PWR_LED-
PWR
GND
HDD_LED+
HDD_LED-
Ground
HWRST#
(NC)
F_PANEL
+PWR_LED-
+HDD_LED- RESET
TPM
PIN 1
VCCSPI
S_PLTRST#
NC
+3V_SPI
F_SPI_CS0#_R
T_SPI_MISO
F_SPI_HOLD#_R
S_SPI_TPM_IRQ#
S_SPI_TPM_CS2#
F_BIOS_WP#_R
GND
T_SPI_CLK
T_SPI_MOSI
ASUS PRIME B550M-A WIFI II
1-6
1.2.2 Rear panel connectors
Ethernet port
Speed
LED
Activity Link
LED
Activity/Link LED Speed LED
Status Description Status Description
OFF No link OFF 10 Mbps connection
ORANGE Linked ORANGE 100 Mbps connection
BLINKING Data activity GREEN 1 Gbps connection
1 2
6 8 9 6
10 11
3 4 5
7
Ethernet port LED indications
1. PS/2 Keyboard/Mouse combo port. This port is for a PS/2 keyboard or mouse.
2. Video Graphics Adapter (VGA) port. This 15-pin port is for a VGA monitor or other
VGA-compatible devices.
3. Ethernet port. This port allows Gigabit connection to a Local Area Network (LAN)
through a network hub. Refer to the table below for the Ethernet port LED indications.
4. Line In port (light blue). This port connects the tape, CD, DVD player, or other audio
sources.
5. Line Out port (lime). This port connects a headphone or a speaker. In 4-channel,
5.1-channel, and 7.1-channel congurations, the function of this port becomes Front
Speaker Out.
6. USB 3.2 Gen 1 (up to 5Gbps) ports. These 9-pin Universal Serial Bus (USB) ports
connect to USB 3.2 Gen 1 devices.
7. DVI-D port. This port is for any DVI-D compatible device.
DVI-D can not be converted to output from RGB Signal to CRT and is not compatible with
DVI-I.
8. HDMI® port. This port is for a High-Denition Multimedia Interface (HDMI®) connector,
and is HDCP compliant allowing playback of HD DVD, Blu-ray, and other protected
content.
9. USB 3.2 Gen 2 (up to 10Gbps) ports (teal blue, Type A). These 9-pin Universal
Serial Bus 3.2 (USB 3.2) ports are for USB 3.2 Gen 2 devices.
Chapter 1: Product Introduction
1-7
10. Wi-Fi ports. Connect the bundled ASUS Wi-Fi antenna connectors to these ports.
11. Microphone port (pink). This port connects a microphone.
Refer to the audio conguration table on the next page for the function of the audio ports in
2, 4, 5.1, or 7.1-channel conguration.
Audio 2, 4, 5.1 or 7.1-channel configuration
Port Headset
2-channel 4-channel 5.1-channel 7.1-channel
Light Blue (Rear panel) Line In Rear Speaker Out Rear Speaker Out Rear Speaker Out
Lime (Rear panel) Line Out Front Speaker Out Front Speaker Out Front Speaker Out
Pink (Rear panel) Mic In Mic In Bass/Center Bass/Center
Lime (Front panel) — — — Side Speaker Out*/
Headphone
Pink (Front panel) — — — Mic In*/
Side Speaker Out
* Multi-streaming is disabled by default, and the Lime (front panel) jack may be used as Side Speaker Out. If multi-
streaming is enabled, the Lime (front panel) jack will support headphone, and Pink (front panel) jack will support
Side Speaker Out.
To configure a 7.1-channel audio output:
Use a chassis with HD audio module in the front panel to support a 7.1-channel audio
output.
ASUS PRIME B550M-A WIFI II
1-8
1.3 Central Processing Unit (CPU)
The motherboard comes with an AMD Socket AM4 designed for AMD
Ryzen™ 5000 Series / 5000 G-Series/ 4000 G-Series/ 3000 Series
Desktop Processors.
Unplug all power cables before installing the CPU.
Installing the CPU
Apply the Thermal Interface Material to the CPU heatsink and CPU before you install the
heatsink and fan if necessary.
1
3
2
4
The AM4 socket has a different pinout design. Ensure that you use a CPU designed for the
AM4 socket. The CPU ts in only one correct orientation. DO NOT force the CPU into the
socket to prevent bending the connectors on the socket and damaging the CPU!
Chapter 1: Product Introduction
1-9
1.4 System memory
This motherboard comes with four Double Data Rate 4 (DDR4) Dual Inline Memory Module
(DIMM) sockets. The gure illustrates the location of the DDR4 DIMM sockets:
• You may install varying memory sizes in Channel A and Channel B. The system
maps the total size of the lower-sized channel for the dual-channel conguration. Any
excess memory from the higher-sized channel is then mapped for single-channel
operation.
• Always install DIMMs with the same CAS latency. For optimal compatibility, we
recommend that you install memory modules of the same version or date code (D/C)
from the same vendor. Check with the retailer to get the correct memory modules.
• A DDR4 memory module is notched differently from a DDR, DDR2, or DDR3 module.
DO NOT install a DDR, DDR2, or DDR3 memory module to the DDR4 slot.
Recommended memory configuration
Channel Sockets
Channel A DIMM_A1 & DIMM_A2*
Channel B DIMM_B1 & DIMM_B2*
• The default memory operation frequency is dependent on its Serial Presence
Detect(SPD), which is the standard way of accessing information from a memory
module. Under the default state, some memory modules for overclocking may operate
at a lower frequency than the vendor-marked value.
• For system stability, use a more efcient memory cooling system to support a full
memory load (4 DIMMs).
• Refer to www.asus.com for the latest Memory QVL (Qualied Vendors Lists), and
memory frequency support depends on the CPU types.
DIMM_B2*
DIMM_A1
DIMM_A2*
DIMM_B2*
DIMM_A2*
DIMM_B1
DIMM_B2*
DIMM_A2*
DIMM_A1
DIMM_B2*
DIMM_B1
ASUS PRIME B550M-A WIFI II
1-10
Installing a DIMM
1 2
B
A
A
To remove a DIMM
B
A
Chapter 1: Product Introduction
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