Asrock B450M/ac Quick Installation Guide

Version 1.0
Published May 2019
Copyright©2019 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.

English

B450M/ac

Motherboard Layout

5

10

1

14

12

11

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

SATA3_3

SATA3_4

SATA3_1

SATA3_2

23

HDMI 1

M2_WIFI

ADDR_LED1

1

RGB_HEADER1

B450M/ac

CI1

15

3

2

4

6

7

8
9

BIOS
ROM

1

English

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)

10 SATA3 Connector (SATA 3_4)

11 SATA3 Connector (SATA3_2)

12 SATA3 Connector (SATA3_1)

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)

2

I/O Panel

B450M/ac

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

English

3

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Chapter 1 Introduction

ank you for purchasing ASRock B450M/ac 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cations and the BIOS soware might be updated, the
content of this manual will be subject to change without notice. In ca se any modica­tions of this manual occur, the updated version will be available on ASRock’s website
without further notice. If you require technical suppor t related to this motherboard,
please visit our website for spe cic information about the model you are using. You
may nd the l atest VGA cards and CPU support list on ASRock’s website a s well.
ASRock website http://www.asrock.com.

1.1 Package Contents

ASRock B450M/ac Motherboard (Micro ATX Form Factor)

•

ASRock B450M/ac Quick Installation Guide

•

ASRock B450M/ac 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)

•

4

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B450M/ac

1.2 Specications

Platform

CPU

Chipset

Memory

•

•

•

•

•

•

•

•

•

•

•

•

* For Ryzen Series CPUs (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/)
* Please refer to page 22 for DDR4 UDIMM maximum frequency
support.

•

•

Micro ATX Form Factor
2oz Copper PCB
Solid Capacitor design

AMD AM4 Socket
Digi Power design
9 Power Phase design

AMD Promontory B450

Dual Channel DDR4 Memory Technology
4 x DDR4 DIMM Slots
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 (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
15μ Gold Contact in DIMM Slots

Expansion
Slot

AMD Ryzen series CPUs (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)

•

AMD Ryzen series CPUs (Raven Ridge)

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

•

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

•

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English

Graphics

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-

•

TM

802.11ac module (on the rear I/O)

TM

Integrated AMD Radeon

•

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 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

•

6

Audio

LAN

7.1 CH HD Audio with Content Protection (Realtek ALC892

•

Audio Codec)

Premium Blu-ray Audio support

•

Supports Surge Protection

•

ELNA Audio Caps

•

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

•

English

B450M/ac

Wireless
LAN

Rear Panel
I/O

Storage

Connector

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 Summit Ridge, Raven Ridge and Pinnacle Ridge)

or Gen3 x2 (16 Gb/s) (with Athlon 2xxGE series APU)*
* Supports NVMe SSD as boot disks
* Supports ASRock U.2 Kit

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.

7

English

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

•

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)

•

English

B450M/ac

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

Please realize that the re is a certain risk involved with overclocking, including adjust­ing the setting in the BIOS, applying Untied Ove rclocking Technology, or using third­party overclocking tools. 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 responsible for possible damage cau sed by overclocking.

9

English

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.

10

English

B450M/ac

2.1 Installing the CPU

Unplug all power cables be fore installing the CPU.

1

2

11

English

3

12

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B450M/ac

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

2

13

English

3

14

4

1

N

FA

_

U

P

C

English

B450M/ac

Installing the AM4 Box Cooler SR2

1

2

15

English

3

16

English

B450M/ac

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).

17

English

Installing the AM4 Box Cooler SR3

1

18

2

English

B450M/ac

3

4

19

English

5

4-pin FAN cable

FAN1

CPU_

20

English

B450M/ac

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).

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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 in stall identical (the same
brand, speed , size and chip-type) DDR4 DIMM pairs.

2. It is unable to activate Du al Channel Memory Technology with only one or three
memory module installed.

3. It is not allowed to install a DDR, DDR2 or DDR3 memory module into a DDR4
slot; otherwise, this motherboard and DIMM may be damaged.

4. We suggest that you install the memory modules on DDR4_A 2 and DDR4_B2 rst
for better DRAM compatibility on 2 DIMM s conguration.

AMD non-XMP Memory Frequency Support

Ryzen Series CPUs (Pinnacle Ridge):

22

UDIMM Memory Slot

A1 A2 B1 B2

Frequency

(Mhz)

- 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

English

B450M/ac

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)

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, 1Rx4 or 1Rx8 on DIMM module label

DR: Dual rank DIMM, 2Rx4 or 2R x8 on DIMM module label

Frequency

(Mhz)

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English

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

1

2

24

3

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B450M/ac

2.4 Expansion Slots (PCI Express Slots)

ere are 2 PCI Express slots on the motherboard.

Before installing an ex pansion card, please make sure that the power supply is
switched o or the power cord is unplugged. Plea se read the documentation of the
expan sion card and make necessary hardware settings for the card before you start
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 (Pinnacle Ridge) x16 x4

Ryzen Series CPUs (Summit Ridge) x16 x4

Ryzen Series CPUs (Raven Ridge) x8 x4

Athlon 2x xGE series APU x4 x4

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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
(CLRMO S1)
(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

26

If you clear the CMOS, the case open may be detec ted. Please adjust the BIOS option
“Clear Status” to clear the record of previou s chassis intrusion status.

English

B450M/ac

2.6 Onboard Headers and Connectors

PLED+

1

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-pi n PANEL1)
(see p.1, No. 13)

PWRBTN (Power Button):

Connec t to the power button on the chassis front 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 chassi s front panel. Press the reset button to
restar t the computer if the computer freezes and fails to perform a nor mal restart.

PLED (Syste m Power LED):
Connec t to the power status indicator on the chassis front panel. e LED i s on when
the system is ope rating. e LED keeps blinking when the system i s 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 front panel. e LED is on
when the hard drive i s reading or writing data.

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

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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English

Power LED and Speaker

R

1

+5V

DUMMY

PLED+

PLED+

PLED-

DUMMY

SPEAKER

DUMMY

GND

GND

P+

P-

USB_PWR

P+

P-

USB_PWR

1

Header
(7-pin SPK_PLED1)
(see p.1, No. 14)

Please connect the
chassis power LED and
the chassis speaker to this
header.

Serial ATA3 Connectors
(SATA3_1:
see p.1, No. 12)
(SATA3_2:
see p.1, No. 11)
(SATA3_3:
see p.1, No. 9)
(SATA3_4:
see p.1, No. 10)

AMD LED Fan USB
Header
(4-pin USB_7)
(see p.1, No. 8)

USB 2.0 Headers
(9-pin USB_3_4)
(see p.1, No. 17)
(9-pin USB_5_6)
(see p.1, No. 18)

SATA3_3

SATA3_1

1

GND

P+

P-

USB_PW

ese four SATA3
connectors support SATA

SATA3_4

data cables for internal
storage devices with up to

6.0 Gb/s data transfer rate.

SATA3_2

is header is used for
connecting the USB
connector on the AMD
SR3 Heatsink.

ere are two headers
on this motherboard.
Each USB 2.0 header can
support two ports.

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