Asrock B450M/ac R2.0 Quick Installation Guide

Version 1.0
Published September 2020
Copyright©2020 ASRock INC. All rights reserved

Copyright Notice:

No part of this documentation may be reproduced, transcribed, transmitted, or
translated in any language, in any form or by any means, except duplication of
documentation by the purchaser for backup purpose, without written consent of
ASRock Inc.

Products and corporate names appearing in this documentation 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.

Disclaimer:

Specications and information contained in this documentation are furnished for
informational use only and subject to change without notice, and should not be
constructed as a commitment by ASRock. ASRock assumes no responsibility for
any errors or omissions that may appear in this documentation.

With respect to the contents of this documentation, ASRock does not provide
warranty of any kind, either expressed or implied, including but not limited to
the implied warranties or conditions of merchantability or tness for a particular
purpose.

In no event shall ASRock, its directors, ocers, employees, or agents be liable for
any indirect, special, incidental, or consequential damages (including damages for
loss of prots, loss of business, loss of data, interruption of business and the like),
even if ASRock has been advised of the possibility of such damages arising from any
defect or error in the documentation or product.

is device complies with Part 15 of the FCC Rules. Operation is subject to the following
two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that

may cause undesired operation.

CALIFORNIA, USA ONLY

e Lithium battery adopted on this motherboard contains Perchlorate, a toxic substance
controlled in Perchlorate Best Management Practices (BMP) regulations passed by the
California Legislature. When you discard the Lithium battery in California, USA, please
follow the related regulations in advance.
“Perchlorate Material-special handling may apply, see www.dtsc.ca.gov/hazardouswaste/
perchlorate”

ASRock Website: http://www.asrock.com

AUSTRALIA ONLY

Our goods come with guarantees that cannot be excluded under the Australian
Consumer Law. You are entitled to a replacement or refund for a major failure and
compensation for any other reasonably foreseeable loss or damage caused by our
goods. You are also entitled to have the goods repaired or replaced if the goods fail
to be of acceptable quality and the failure does not amount to a major failure. If
you require assistance please call ASRock Tel : [phone] ext.123 (Standard
International call charges apply)

e terms HDMI® and HDMI High-Denition Multimedia Interface, and the
HDMI logo are trademarks or registered trademarks of HDMI Licensing LLC in the
United States and other countries.

Motherboard Layout

5

1

14

ATXPWR1

Sup er

I/O

CLRCMOS1

1

PCIE1

1

USB_3_4

HD_AUDIO1

1

CPU_FAN1

Top:

LINE IN

Center :

FRONT

Bottom :

MIC IN

RJ- 45 LAN

USB 2.0
T: USB1
B: USB2

SOCKETAM4

CMOS

Battery

ATX12V1

M2_1

Ultra M.2

PCIe Gen3x4

USB3_5 _6

1

CHA_FAN1

CHA_FAN2

HDLED RESET

PLED PWRBTN

PANEL1

1

RoHS

SPK_PLED1

1

DDR4 _A1 (64 b it, 288 -pin mo dule)

DDR4 _A2 (64 b it, 288 -pin mo dule)

DDR4 _B1 (64 b it, 288 -pin mo dule)

DDR4 _B2 (64 b it, 288 -pin mo dule)

PCIE2

AMD

Promontory

B450

USB 3.2 Gen1
T: USB1
B: USB2

USB 3.2 Gen1
T: USB3
B: USB4

1

AMD_FAN_LED1

1

USB_7

1

M2_1_CT3M2_1_CT2M 2_1_CT1

1

USB_5_6

23

HDMI 1

M2_WIFI

ADDR_LED1

1

RGB_HEADER1

B450M/ac

CI1

15

10

11

12

SATA3_3

SATA3_4

SATA3_1

SATA3_2

9

B450M/ac R2.0

3

2

4

6

7

8

BIOS
ROM

English

1

No. Description

1 ATX 12V Power Connector (ATX12V1)

2 CPU Fan Connector (CPU_FAN1)

3 2 x 288-pin DDR4 DIMM Slots (DDR4_A1, DDR4_B1)

4 2 x 288-pin DDR4 DIMM Slots (DDR4_A2, DDR4_B2)

5 AMD Fan LED Header (AMD_FAN_LED1)

6 ATX Power Connector (ATXPWR1)

7 USB 3.2 Gen1 Header (USB3_5_6)

8 AMD LED Fan USB Header (USB_7)

9 SATA3 Connector (SATA3_3)(Upper)

10 SATA3 Connector (SATA3_4)(Lower)

11 SATA3 Connector (SATA3_2)(Lower)

12 SATA3 Connector (SATA3_1)(Upper)

13 System Panel Header (PANEL1)

14 Power LED and Speaker Header (SPK_PLED1)

15 Chassis Intrusion Header (CI1)

16 Chassis Fan Connector (CHA_FAN2)

17 USB 2.0 Header (USB_3_4)

18 USB 2.0 Header (USB_5_6)

19 Clear CMOS Jumper (CLRCMOS1)

20 RGB LED Header (RGB_HEADER1)

21 Addressable LED Header (ADDR_LED1)

22 Front Panel Audio Header (HD_AUDIO1)

23 Chassis/Water Pump Fan Connector (CHA_FAN1)

English

2

I/O Panel

B450M/ac R2.0

2

1

3

6 589 7

No. Description No. Description

1 LAN RJ-45 Port* 6 USB 3.2 Gen1 Ports (USB3_1_2)

2 Line In (Light Blue)** 7 HDMI Port

3 Front Speaker (Lime)** 8 USB 2.0 Ports (USB_1_2)

4 Microphone (Pink)** 9 Antenna Ports

5 USB 3.2 Gen1 Ports (USB3_3_4)

* ere are two LEDs on each LAN port. Please refer to the table below for the LAN port LED indications.

ACT/LINK LED

SPEED LED

LAN Por t

Activity / Link LED Speed LED

Status Description Status Description

O No Link O 10Mbps connection
Blinking Data Activity Orange 100Mbps connection
On Link Green 1Gbps connection

4

** Function of the Audio Ports in 7.1-channel Conguration:

Port Function

Light Blue (Rear panel) Rear Speaker Out
Lime (Rear panel) Front Speaker Out
Pink (Rear panel) Central /Subwoofer Speaker Out
Lime (Front panel) Side Speaker Out

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3

Chapter 1 Introduction

ank you for purchasing ASRock B450M/ac R2.0 motherboard, a reliable
motherboard produced under ASRock ’s consistently stringent quality control.
It delivers excellent performance with robust design conforming to ASRock’s
commitment to quality and endurance.

Becau se the motherboard specication s and the BIOS soware might be updated, the
content of this manual will be subjec t to change without notice. In case any modica­tions of this manual occur, the updated version will be available on ASRock’s website
without further notice. If you require technical support related to this motherboard,
please visit our website for specic information about the model you are using. You
may nd the l atest VGA cards and CPU support list on ASRock’s website as well.
ASRock website http://www.asrock.com.

1.1 Package Contents

ASRock B450M/ac R2.0 Motherboard (Micro ATX Form Factor)

•

ASRock B450M/ac R2.0 Quick Installation Guide

•

ASRock B450M/ac R2.0 Support CD

•

1 x I/O Panel Shield

•

2 x Serial ATA (SATA) Data Cables (Optional)

•

2 x ASRock WiFi 2.4/5 GHz Antennas (Optional)

•

1 x Screw for M.2 Socket (Optional)

•

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4

1.2 Specications

Platform

CPU

Chipset

Memory

•

•

•

•

•

•

•

•

•

•

•

•

•

•

* For Ryzen Series CPUs (Picasso and Raven Ridge), ECC is only
supported with PRO CPUs.
* Please refer to Memory Support List on ASRock's website for
more information. (http://www.asrock.com/)

•

•

•

B450M/ac R2.0

Micro ATX Form Factor
2oz Copper PCB
Solid Capacitor design

AMD AM4 Socket
Digi Power design
10 Power Phase design

AMD Promontory B450

Dual Channel DDR4 Memory Technology
4 x DDR4 DIMM Slots
AMD Ryzen series CPUs (Matisse) support DDR4
3200/2933/2667/2400/2133 ECC & non-ECC, un-buered
memory*
AMD Ryzen series CPUs (Pinnacle Ridge) support DDR4
3200+(OC)/2933(OC)/2667/2400/2133 ECC & non-ECC, un­buered memory*
AMD Ryzen series CPUs (Picasso) support DDR4
2933/2667/2400/2133 non-ECC, un-buered memory*
AMD Ryzen series CPUs (Summit Ridge) support DDR4
3200+(OC)/2933(OC)/2667/2400/2133 ECC & non-ECC, un­buered memory*
AMD Ryzen series CPUs (Raven Ridge) support DDR4
3200+(OC)/2933/2667/2400/2133 non-ECC, un-buered
memory*

Max. capacity of system memory: 64GB
Supports Extreme Memory Prole (XMP) memory modules
15μ Gold Contact in DIMM Slots

Expansion
Slot

AMD Ryzen series CPUs (Matisse, Summit Ridge and

Pinnacle Ridge)

1 x PCI Express 3.0 x16 Slot (PCIE1: x16 mode)*

•

1 x PCI Express 2.0 x16 Slot (PCIE2: x4 mode)

•

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5

Graphics

AMD Ryzen series CPUs (Picasso, Raven Ridge)

1 x PCI Express 3.0 x16 Slot (PCIE1: x8 mode)*

•

1 x PCI Express 2.0 x16 Slot (PCIE2: x4 mode)

AMD Athlon series CPUs

1 x PCI Express 3.0 x16 Slot (PCIE1: x4 mode)*

•

1 x PCI Express 2.0 x16 Slot (PCIE2: x4 mode)

•

* Supports NVMe SSD as boot disks

Supports AMD Quad CrossFireXTM and CrossFireX

•

1 x Vertical M.2 Socket (Key E) with the bundled WiFi-

•

802.11ac module (on the rear I/O)

Integrated AMD RadeonTM Vega Series Graphics in Ryzen

•

Series APU*

* Actual support may vary by CPU

DirectX 12, Pixel Shader 5.0

•

Shared memory default 2GB. Max Shared memory supports

•

up to 16GB.
* e Max shared memory 16GB requires 32GB system memory
installed.

Supports HDMI 1.4 with max. resolution up to 4K x 2K

•

(4096x2160) @ 24Hz / (3840x2160) @ 30Hz

Supports Auto Lip Sync, Deep Color (12bpc), xvYCC and

•

HBR (High Bit Rate Audio) with HDMI 1.4 Port (Compliant

HDMI monitor is required)

Supports HDCP 1.4 with HDMI 1.4 Port

•

Supports 4K Ultra HD (UHD) playback with HDMI 1.4 Port

•

TM

English

6

Audio

LAN

7.1 CH HD Audio with Content Protection (Realtek

•

ALC892/897 Audio Codec)

Supports Surge Protection

•

PCIE x1 Gigabit LAN 10/100/1000 Mb/s

•

Realtek RTL8111H

•

Supports Wake-On-LAN

•

Supports Lightning/ESD Protection

•

Supports Energy Ecient Ethernet 802.3az

•

Supports PXE

•

Wireless
LAN

Rear Panel
I/O

Storage

Intel® 802.11ac WiFi Module

•

Supports IEEE 802.11a/b/g/n/ac

•

Supports Dual-Band (2.4/5 GHz)

•

Supports high speed wireless connections up to 433Mbps

•

Supports Bluetooth 4.2 / 3.0 + High speed class II

•

2 x Antenna Ports

•

1 x HDMI Port

•

2 x USB 2.0 Ports (Supports ESD Protection)

•

4 x USB 3.2 Gen1 Ports (Supports ESD Protection)

•

1 x RJ-45 LAN Port with LED (ACT/LINK LED and SPEED

•

LED)
HD Audio Jacks: Line in / Front Speaker / Microphone

•

4 x SATA3 6.0 Gb/s Connectors, support RAID (RAID 0,

•

RAID 1 and RAID 10), NCQ, AHCI and Hot Plug
1 x Ultra M.2 Socket (M2_1), supports M Key type

•

2242/2260/2280 M.2 PCI Express module up to Gen3 x4 (32
Gb/s) (with Matisse, Picasso, Summit Ridge, Raven Ridge
and Pinnacle Ridge) or Gen3 x2 (16 Gb/s) (with Athlon series

APU)*
* Supports NVMe SSD as boot disks
* Supports ASRock U.2 Kit

B450M/ac R2.0

Connector

1 x Chassis Intrusion Header

•

1 x Power LED and Speaker Header

•

1 x RGB LED Header

•

* Supports in total up to 12V/3A, 36W LED Strip

1 x Addressable LED Header

•

* Supports in total up to 5V/3A, 15W LED Strip

1 x AMD Fan LED Header

•

*e AMD Fan LED Header supports LED strips of maximum
load of 3A (36W) and length up to 2.5M.

1 x CPU Fan Connector (4-pin)

•

* e CPU Fan Connector supports the CPU fan of maximum
1A (12W) fan power.

English

7

BIOS
Feature

1 x Chassis Fan Connector (3-pin)

•

* e Chassis Fan Connector supports the chassis fan of
maximum 1A (12W) fan power.

1 x Chassis/Water Pump Fan Connector (4-pin) (Smart Fan

•

Speed Control)
* e Chassis/Water Pump Fan supports the water cooler fan of
maximum 2A (24W) fan power.
* CHA_FAN1 can auto detect if 3-pin or 4-pin fan is in use.

1 x 24 pin ATX Power Connector

•

1 x 8 pin 12V Power Connector

•

1 x Front Panel Audio Connector

•

1 x AMD LED Fan USB Header

•

2 x USB 2.0 Headers (Support 4 USB 2.0 ports) (Supports ESD

•

Protection)

1 x USB 3.2 Gen1 Header (Supports 2 USB 3.2 Gen1 ports)

•

(Supports ESD Protection)

AMI UEFI Legal BIOS with multilingual GUI support

•

Supports “Plug and Play”

•

ACPI 5.1 compliance wake up events

•

Supports jumperfree

•

SMBIOS 2.3 support

•

DRAM Voltage multi-adjustment

•

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8

Hardware
Monitor

OS

Certica­tions

Temperature Sensing: CPU, Chassis, Chassis/Water Pump

•

Fans

Fan Tachometer: CPU, Chassis, Chassis/Water Pump Fans

•

Quiet Fan (Auto adjust chassis fan speed by CPU tempera-

•

ture): CPU, Chassis, Chassis/Water Pump Fans

Fan Multi-Speed Control: CPU, Chassis, Chassis/Water

•

Pump Fans

CASE OPEN detection

•

Voltage monitoring: +12V, +5V, +3.3V, Vcore

•

Microso® Windows® 10 64-bit

•

FCC, CE

•

ErP/EuP ready (ErP/EuP ready power supply is required)

•

* For detailed product infor mation, please visit our website: http://www.asrock .com

Please realize that there is a certain risk involved with overclocking, including adjust­ing the setting in the BIOS, applying Untied Overclocking Technology, or using third­party overclocking tool s. Overclocking may aect your system’s stability, or even cause
damage to the components and devices of your system. It should be done at your own
risk and expense. We are not re sponsible for possible damage caused by overclocking.

B450M/ac R2.0

English

9

Chapter 2 Installation

is is a Micro ATX form factor motherboard. Before you install the motherboard,
study the conguration of your chassis to ensure that the motherboard ts into it.

Pre-installation Precautions

Take note of the following precautions before you install motherboard components
or change any motherboard settings.

Make sure to unplug the power cord before installing or removing the motherboard.

•

Failure to do so may cause physical injuries to you and damages to motherboard
components.
In order to avoid damage from static electricity to the motherboard’s components,

•

NEVER place your motherboard directly on a carpet. Also remember to use a grounded
wrist strap or touch a safety grounded object before you handle the components.
Hold components by the edges and do not touch the ICs.

•

Whenever you uninstall any components, place them on a grounded anti-static pad or

•

in the bag that comes with the components.
When placing screws to secure the motherboard to the chassis, please do not over-

•

tighten the screws! Doing so may damage the motherboard.

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10

2.1 Installing the CPU

Unplug all power cables before installing the CPU.

1

B450M/ac R2.0

2

English

11

3

English

12

2.2 Installing the CPU Fan and Heatsink

Aer you install the CPU into this motherboard, it is necessary to install a larger
heatsink and cooling fan to dissipate heat. You also need to spray thermal grease
between the CPU and the heatsink to improve heat dissipation. Make sure that the
CPU and the heatsink are securely fastened and in good contact with each other.

Please turn o the power or remove the power cord before changing a CPU or heatsink .

Installing the CPU Box Cooler SR1

1

B450M/ac R2.0

2

English

13

3

English

14

4

1

N

FA

_

U

P

C

Installing the AM4 Box Cooler SR2

1

B450M/ac R2.0

2

English

15

3

English

16

B450M/ac R2.0

4

1

N

FA

_

U

P

C

5

4-pin FAN cable

RGB LED Cable

1

FAN

CPU_

1

D

LE

_

N

FA

_

D

AM

+12V

*e diagram shown here are for reference only. Please refer to page 32 for the orientation of
AMD Fan LED Header (AMD_FAN_LED1).

English

17

Installing the AM4 Box Cooler SR3

1

English

18

2

B450M/ac R2.0

4

3

English

19

5

4-pin FAN cable

FAN1

CPU_

English

20

B450M/ac R2.0

6

1

N

FA

_
U
P

C

1

D

E

L

_

N

FA

_

D

AM

+12V

or

7

1

N

FA

_
U
P

C

1

D

E

L

_

N

FA

_

D

AM

5

_

B

S

U

Please note that only one cable should be used at a time in this step.
If you select AMD_FAN_LED1, please install ASRock utility "ASRock Polychrome SYNC".
If you select USB connector, please install AMD utility "SR3 Settings Soware".

*e diagram shown here are for reference only. Please refer to page 32 for the orientation of AMD Fan
LED Header (AMD_FAN_LED1) and page 29 for the orientation of AMD LED Fan USB Header (USB_7).

21

English

2.3 Installing Memory Modules (DIMM)

is motherboard provides four 288-pin DDR4 (Double Data Rate 4) DIMM slots,
and supports Dual Channel Memory Technology.

1. For dual channel conguration, you always need to install identical (the same
brand, speed, size and chip-ty pe) DDR4 DIMM pairs.

2. It is unable to activate Dual Channel Memory Technology w ith only one or three
memory module installed.

3. It is not allowed to install a DDR, DDR2 or DDR 3 memory modul e into a DDR4
slot; otherwise, this motherboard and DIMM may be damaged.

AMD non-XMP Memory Frequency Support

Ryzen Series CPUs (Matisse):

English

22

UDIMM Memory Slot

A1 A2 B1 B2

- SR - - 3200

- DR - - 3200

- SR - SR 3200

- DR - DR 3200

SR SR SR SR 2933

SR/DR DR SR/DR DR 2667

SR/DR SR/DR SR/DR SR/DR 2667

Frequency

(Mhz)

Ryzen Series CPUs (Pinnacle Ridge):

UDIMM Memory Slot

A1 A2 B1 B2

- SR - - 2933

- DR - - 2933

- SR - SR 2933

- DR - DR 2933

SR SR SR SR 2933

SR/DR DR SR/DR DR 2667

SR/DR SR/DR SR/DR SR/DR 2133-2400

Frequency

(Mhz)

Ryzen Series CPUs (Picasso):

B450M/ac R2.0

UDIMM Memory Slot

A1 A2 B1 B2

- SR - - 2933

- DR - - 2667

- SR - SR 2667

- DR - DR 2400

SR SR SR SR 2133

SR/DR DR SR/DR DR 1866

SR/DR SR/DR SR/DR SR/DR 186 6

Frequency

(Mhz)

Ryzen Series CPUs (Summit Ridge):

UDIMM Memory Slot

A1 A2 B1 B2

- SR - - 2667

- DR - - 2667

- SR - SR 2667

- DR - DR 2667

SR SR SR SR 2667

SR/DR DR SR/DR DR 2667

SR/DR SR/DR SR/DR SR/DR 2133-2400

Frequency

(Mhz)

23

English

Ryzen Series CPUs (Raven Ridge):

UDIMM Memory Slot

A1 A2 B1 B2

- SR - - 2933

- DR - - 2667

- SR - SR 2667

- DR - DR 2667

SR SR SR SR 2667

SR/DR DR SR/DR DR 2667

SR/DR SR/DR SR/DR SR/DR 2133-2400

SR: Single rank DIMM, 1R x4 or 1Rx8 on DIMM module label

DR: Dual rank DIMM, 2R x4 or 2Rx8 on DIMM module label

Frequency

(Mhz)

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24

e DIMM only ts in one correct orientation. It will cause permanent damage to
the motherboard and the DIMM if you force the DIMM into the slot at incorrect
orientation.

1

2

B450M/ac R2.0

3

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25

2.4 Expansion Slots (PCI Express Slots)

ere are 2 PCI Express slots on the motherboard.

Before installing an expansion card, please mak e sure that the power supply is
switched o or the power cord is unplug ged. Please read the documentation of the
expan sion card and make necessary hardware settings for the card before you star t
the installation.

PCIe slots:

PCIE1 (PCIe 3.0 x16 slot) is used for PCI Express x16 lane width graphics cards.
PCIE2 (PCIe 2.0 x16 slot) is used for PCI Express x4 lane width graphics cards.

PCIe Slot Congurations

PCIE1 PCIE2

Ryzen Series CPUs (Matisse Ridge) x16 x4

Ryzen Series CPUs (Pinnacle Ridge) x16 x4

Ryzen Series CPUs (Summit Ridge) x16 x4

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26

Ryzen Series CPUs (Picasso Ridge) x8 x4

Ryzen Series CPUs (Raven Ridge) x8 x4

Athlon Series CPUs x4 x4

2.5 Jumpers Setup

e illustration shows how jumpers are setup. When the jumper cap is placed on
the pins, the jumper is “Short”. If no jumper cap is placed on the pins, the jumper is

“Open”.

Clear CMOS Jumper
(CLR MOS1)
(see p.1, No. 19)

CLRMOS1 allows you to clear the data in CMOS. To clear and reset the system
parameters to default setup, please turn o the computer and unplug the power
cord from the power supply. Aer waiting for 15 seconds, use a jumper cap to
short the pins on CLRMOS1 for 5 seconds. However, please do not clear the
CMOS right aer you update the BIOS. If you need to clear the CMOS when you
just nish updating the BIOS, you must boot up the system rst, and then shut it
down before you do the clear-CMOS action. Please be noted that the password,
date, time, and user default prole will be cleared only if the CMOS battery is
removed. Please remember toremove the jumper cap aer clearing the CMOS.

2-pin Jumper

B450M/ac R2.0

If you clear the CMOS, the case open may be detected. Please adjust the BIOS option
“Clear Status” to clear the record of prev ious chassis intru sion status.

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27

2.6 Onboard Headers and Connectors

PLED+

Onboard headers and connectors are NOT jumpers. Do NOT place jumper caps over
these headers and connectors. Placing jumper caps over the headers and connectors
will cause permanent damage to the motherboard.

System Panel Header
(9-p in PA NEL1)
(see p.1, No. 13)

PWRBTN (Power But ton):

Connec t to the power button on the chassis f ront panel. You may congure the way to
turn o your system using the power button.

RESET (Reset Button):
Connec t to the reset button on the chassis f ront panel. Pre ss the reset button to
restar t the computer if the computer freezes and fails to perform a normal restart.

PLED (Syste m Power LED):
Connec t to the power status indicator on the chassi s front panel. e LED is on when
the system is operating. e LED keeps blinking when the system is in S1/S3 sleep
state. e LED is o when the system is in S4 sleep state or powered o (S5).

HDLED (Ha rd Drive Activity LED):
Connec t to the hard drive activity LED on the chassis f ront panel. e LED is on
when the hard drive is reading or writing data.

e front panel design may dier by chassis . A front panel module mainly consists
of power button, reset but ton, power LED, hard drive activity LED, speaker and etc.
When connecting your cha ssis front panel module to this header, make sure the wire
assig nments and the pin assignments are matched correctly.

1

PLED-

HDLED-

HDLED+

PWRBTN#

GND

RESET#

GND

GND

Connect the power
button, reset button and
system status indicator on
the chassis to this header
according to the pin
assignments below. Note
the positive and negative
pins before connecting
the cables.

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28