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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 identication or explanation and to the owners’ benet, without intent to
infringe.
Disclaimer:
Specications 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, ocers, employees, or agents be liable for
any indirect, special, incidental, or consequential damages (including damages for
loss of prots, 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 : +886-2-28965588 ext.123 (Standard
International call charges apply)
e terms HDMI® and HDMI High-Denition Multimedia Interface, and the
HDMI logo are trademarks or registered trademarks of HDMI Licensing LLC in the
United States and other countries.

CE Warning
is device complies with directive 2014/53/EU issued by the Commision of the European
Community.
is equipment complies with EU radiation exposure limits set forth for an uncontrolled
environment.
is equipment should be installed and operated with minimum distance 20cm between
the radiator & your body.
Operations in the 5.15-5.35GHz band are restricted to indoor usage only.
Radio transmit power per transceiver type
Function Frequency Maximum Output Power (EIRP)
WiFi
2400-2483.5 MHz 18.5 + / -1.5 dbm
5150-5250 MHz 21.5 + / -1.5 dbm
5250-5350 MHz 18.5 + / -1.5 dbm (no TPC)
21.5 + / -1.5 dbm (TPC)
5470-5725 MHz 25.5 + / -1.5 dbm (no TPC)
28.5 + / -1.5 dbm (TPC)
Bluetooth 2400-2483.5 MHz 8.5 + / -1.5 dbm

Contents
Chapter 1 Introduction 1
1.1 Package Contents 1
1.2 Specications 2
1.3 Motherboard Layout 7
1.4 I/O Panel 9
1.5 WiFi-802.11ac Module and ASRock WiFi 2.4/5 GHz
Antenna 11
Chapter 2 Installation 13
2.1 Installing the CPU 14
2.2 Installing the CPU Fan and Heatsink 16
2.3 Installing Memory Modules (DIMM) 25
2.4 Expansion Slots (PCI Express Slots) 28
2.5 Jumpers Setup 29
2.6 Onboard Headers and Connectors 30
2.7 M.2_SSD (NGFF) Module Installation Guide (M2_1) 35
Chapter 3 Software and Utilities Operation 38
3.1 Installing Drivers 38
3.2 A-Tuning 39
3.2.1 Installing A-Tuning 39
3.2.2 Using A-Tuning 39
3.3 ASRock Live Update & APP Shop 42
3.3.1 UI Overview 42

3.3.2 Apps 43
3.3.3 BIOS & Drivers 46
3.3.4 Setting 47
3.5 ASRock Polychrome SYNC 48
Chapter 4 UEFI SETUP UTILITY 51
4.1 Introduction 51
4.1.1 UEFI Menu Bar 51
4.1.2 Navigation Keys 52
4.2 Main Screen 53
4.3 OC Tweaker Screen 54
4.4 Advanced Screen 57
4.4.1 CPU Conguration 58
4.4.2 North Bridge Conguration 59
4.4.3 South Bridge Conguration 60
4.4.4 Storage Conguration 61
4.4.5 ACPI Conguration 62
4.4.6 Trusted Computing 63
4.4.7 AMD CBS 64
4.4.8 AMD PBS 72
4.5 Tools 73
4.6 Hardware Health Event Monitoring Screen 74
4.7 Security Screen 76
4.8 Boot Screen 77
4.9 Exit Screen 79

B450M/ac
1
English
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.
In this manual, Chapter 1 and 2 contains the introduction of the motherboard
and step-by-step installation guides. Chapter 3 contains the operation guide of the
soware and utilities. Chapter 4 contains the conguration guide of the BIOS setup.
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)
Because the motherboard specications and the BIOS soware might be updated, the
content of this manual will be subject to change without notice. In case any modica-
tions 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 specic information about the model you are using. You
may nd the latest VGA cards and CPU support list on ASRock’s website as well.
ASRock website http://www.asrock.com.

English
2
1.2 Specications
Platform • Micro ATX Form Factor
• 2oz Copper PCB
• Solid Capacitor design
CPU • AMD AM4 Socket
• Digi Power design
• 9 Power Phase design
Chipset • AMD Promontory B450
Memory • 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, un-
buered memory*
• AMD Ryzen series CPUs (Summit Ridge) support DDR4
3200+(OC)/2933(OC)/2667/2400/2133 ECC & non-ECC, un-
buered memory*
• AMD Ryzen series CPUs (Raven Ridge) support DDR4
3200+(OC)/2933/2667/2400/2133 non-ECC, un-buered
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 24 for DDR4 UDIMM maximum frequency
support.
• 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: p8-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: p8-x4 mode)

B450M/ac
3
English
AMD Athlon series CPUs
• 1 x PCI Express 3.0 x16 Slot (PCIE1: p9-x4 mode)*
• 1 x PCI Express 2.0 x16 Slot (PCIE2: p9-x4 mode)
* Supports NVMe SSD as boot disks
• Supports AMD Quad CrossFireXTM and CrossFireXTM
• 1 x Vertical M.2 Socket (Key E) with the bundled WiFi-
802.11ac module (on the rear I/O)
Graphics • 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 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
Audio • 7.1 CH HD Audio with Content Protection (Realtek ALC892
Audio Codec)
• Premium Blu-ray Audio support
• Supports Surge Protection
• ELNA Audio Caps
LAN • PCIE p9-x1 Gigabit LAN 10/100/1000 Mb/s
• Realtek RTL8111H
• Supports Wake-On-LAN
• Supports Lightning/ESD Protection
• Supports Energy Ecient Ethernet 802.3az
• Supports PXE

English
4
Wireless
LAN
• 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
Rear Panel
I/O
• 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
Storage • 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 p10-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
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.

B450M/ac
7
English
1.3 Motherboard Layout
3 42
6
5
7
8
9
10
1
1417
16
12
11
1819 13
BIOS
ROM
ATXPWR1
Supe r
I/O
CLR CMO S1
1
PCIE1
1
USB_ 3_4
HD_AUDIO1
1
CPU_ FAN1
Top:
LIN E IN
Cen t er:
FRO NT
Bot t om:
MIC I N
RJ- 45 LA N
US 2.B 0
T: 1USB
B: USB 2
SOCKET AM4
CMOS
Batt ery
ATX 112 V
M2_1
Ultr M.a 2
PCIe x 4 Ge n3
USB 3_5_6
1
CHA_FAN1
CHA_FAN2
HDL ED ESET R
PL ED PW RBT N
PAN EL 1
1
RoHS
SPK_ PLE D 1
1
DDR 4_A1 (64 bit, 288-pin m odul e)
DDR 4_A2 (64 bit, 288-pin m odul e)
DDR 4_B1 (6 4 bit, 288- pi n m odule)
DDR 4_B2 (6 4 bit, 288- pi n m odule)
PCIE2
AMD
Promont ory
B450
US 3. Gen1B 2
T: 1USB
B: USB 2
US 3. Gen1B 2
T: 3USB
B: USB 4
1
AM D _F AN _ LED 1
1
USB_ 7
1
M 3M 2M 1 2_1_CT2_1_CT2_1_CT
1
USB_ 5_6
SAT A3 _3
SAT A3 _4
SAT A3 _1
SAT A3 _2
22
23
HDM I1
M2_WIFI
20
ADDR _L ED1
1
RG B _HE ADE R 1
B450M/ac
CI1
1521

English
8
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 (SATA3_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)

B450M/ac
9
English
1.4 I/O Panel
No. No.Description 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.
Activity / Link LED Speed LED
Status StatusDescription Description
O ONo Link 10Mbps connection
Blinking Data Activity Orange 100Mbps connection
On Link Green 1Gbps connection
ACT/LINK LED
SPEED LED
LAN Port
6 589 7
1
4
3
2
** Function of the Audio Ports in 7.1-channel Conguration:
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
10
1.5 WiFi-802.11ac Module and ASRock WiFi 2.4/5 GHz
Antenna
WiFi-802.11ac + BT Module
is motherboard comes with an exclusive WiFi 802.11 a/b/g/n/ac + BT v4.2
module (pre-installed on the rear I/O panel) that oers support for WiFi 802.11 a/b/
g/n/ac connectivity standards and Bluetooth v4.2. WiFi + BT module is an easy-to-
use wireless local area network (WLAN) adapter to support WiFi + BT. Bluetooth
v4.2 standard features Smart Ready technology that adds a whole new class of
functionality into the mobile devices. BT 4.2 also includes Low Energy Technology
and ensures extraordinary low power consumption for PCs.
* e transmission speed may vary according to the environment.

B450M/ac
11
English
WiFi Antennas Installation Guide
Step 1
Prepare the WiFi 2.4/5 GHz Antennas that come
with the package.
Step 2
Connect the two WiFi 2.4/5 GHz Antennas to
the antenna connectors. Turn the antenna clock-
wise until it is securely connected.
Step 3
Set the WiFi 2.4/5 GHz Antenna as shown in the
illustration.
*You may need to adjust the direction of
the antenna for a stronger signal.

English
12
is is a Micro ATX form factor motherboard. Before you install the motherboard,
study the conguration 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.
Chapter 2 Installation

English
14
3

B450M/ac
15
English
2.2 Installing the CPU Fan and Heatsink
Aer 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.
Installing the CPU Box Cooler SR1
Please turn o the power or remove the power cord before changing a CPU or heatsink.
1
2

B450M/ac
17
English
Installing the AM4 Box Cooler SR2
1
2

English
18
3

B450M/ac
19
English
4-pin FAN cable
RGB LED Cable
+12V
*e diagram shown here are for reference only. Please refer to page 33 for the orientation of
AMD Fan LED Header (AMD_FAN_LED1).
5
CPU_FAN
1
AM
D_
FA N
_
LED
1
4
C
PU
_
FAN1

English
20
Installing the AM4 Box Cooler SR3
1
2

B450M/ac
21
English
3
4

English
22
5
CPU_
FAN1
4-pin FAN cable

B450M/ac
23
English
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 Soware".
*e diagram shown here are for reference only. Please refer to page 33 for the orientation of AMD Fan
LED Header (AMD_FAN_LED1) and page 30 for the orientation of AMD LED Fan USB Header (USB_7).
7
6
C
PU
_FAN
1
AM
D
_FA
N
_L
ED
1
C
PU
_FAN
1
AM
D
_FA
N
_L
E
D
1
U
SB
_5
or
+12V
Produktspecifikationer
Varumärke: | Asrock |
Kategori: | moderkort |
Modell: | B450M/ac |
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