ASROCK B450 Pro4 R2.0 User manual

Version 1.0
Published October 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.

Contents
Chapter 1 Introduction 1
1.1 Package Contents 1
1.2 Specications 2
1.3 Motherboard Layout 7
1.4 I/O Panel 9
Chapter 2 Installation 11
2.1 Installing the CPU 12
2.2 Installing the CPU Fan and Heatsink 14
2.3 Installing Memory Modules (DIMM) 22
2.4 Expansion Slots (PCI Express Slots) 26
2.5 Jumpers Setup 27
2.6 Onboard Headers and Connectors 28
2.7 CrossFireXTM and Quad CrossFireXTM Operation Guide 33
2.7.1 Installing Two CrossFireXTM-Ready Graphics Cards 33
2.7.2 Driver Installation and Setup 35
2.8 M.2_SSD (NGFF) Module Installation Guide (M2_1) 36
2.9 M.2_SSD (NGFF) Module Installation Guide (M2_2) 39
Chapter 3 Software and Utilities Operation 42
3.1 Installing Drivers 42
3.2 A-Tuning 43
3.3 ASRock Live Update & APP Shop 46
3.3.1 UI Overview 46

3.3.2 Apps 47
3.3.3 BIOS & Drivers 50
3.3.4 Setting 51
3.4 ASRock Polychrome LED 52
Chapter 4 UEFI SETUP UTILITY 55
4.1 Introduction 55
4.1.1 UEFI Menu Bar 55
4.1.2 Navigation Keys 56
4.2 Main Screen 57
4.3 OC Tweaker Screen 58
4.4 Advanced Screen 60
4.4.1 CPU Conguration 61
4.4.2 North Bridge Conguration 62
4.4.3 South Bridge Conguration 63
4.4.4 Storage Conguration 64
4.4.5 Super IO Conguration 65
4.4.6 ACPI Conguration 66
4.4.7 Trusted Computing 67
4.4.8 AMD PBS 68
4.5 Tool 69
4.6 Hardware Health Event Monitoring Screen 71
4.7 Security Screen 73
4.8 Boot Screen 74
4.9 Exit Screen 77

B450 Pro4 R2.0
1
English
Chapter 1 Introduction
ank you for purchasing ASRock B450 Pro4 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.
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
soware and utilities. Chapter 4 contains the conguration guide of the BIOS setup.
1.1 Package Contents
• ASRock B450 Pro4 R2.0 Motherboard (ATX Form Factor)
• ASRock B450 Pro4 R2.0 Quick Installation Guide
• ASRock B450 Pro4 R2.0 Support CD
• 1 x I/O Panel Shield
• 2 x Serial ATA (SATA) Data Cables (Optional)
• 2 x Screws for M.2 Sockets (Optional)
Because 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 case any modica-
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 specic 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.

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1.2 Specications
Platform • ATX Form Factor
• Solid Capacitor design
CPU • AMD AM4 Socket
• Digi Power design
• 10 Power Phase design
Chipset • AMD Promontory B450
Memory • 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, un-
bu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, un-
buered memory*
• AMD Ryzen series CPUs (Raven Ridge) support DDR4
3200+(OC)/2933/2667/2400/2133 non-ECC, un-buered
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/)
• Max. capacity of system memory: 64GB
• Supports Extreme Memory Prole (XMP) memory modules
• 15μ Gold Contact in DIMM Slots

B450 Pro4 R2.0
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Expansion
Slot
AMD Ryzen series CPUs (Matisse, Summit Ridge and Pinnacle
Ridge)
• 2 x PCI Express 3.0 x16 Slots (PCIE2: x16 mode; PCIE4: x4
mode)*
AMD Ryzen series CPUs (Picasso, Raven Ridge)
• 2 x PCI Express 3.0 x16 Slots (PCIE2: x8 mode; PCIE4: x4
mode)*
AMD Athlon series CPUs
• 2 x PCI Express 3.0 x16 Slots (PCIE2: x4 mode; PCIE4: x2
mode)*
* Supports NVMe SSD as boot disks
* If M2_1 is occupied, PCIE4 will be disabled.
• 4 x PCI Express 2.0 x1 Slots
• Supports AMD Quad CrossFireXTM and CrossFireXTM**
** is feature is only supported with Ryzen Series CPUs
(Matisse, Summit Ridge, Pinnacle Ridge, Picasso and Raven
Ridge).
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.
• ree graphics output options: D-Sub, HDMI and
DisplayPort 1.2
• Supports Triple Monitor
• Supports HDMI 1.4 with max. resolution up to 4K x 2K
(4096x2160) @ 24Hz / (3840x2160) @ 30Hz
• Supports DisplayPort 1.2 with max. resolution up to 4K x 2K
(4096x2160) @ 60Hz
• Supports D-Sub with max. resolution up to 1920x1200 @
60Hz

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• 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 and DisplayPort 1.2 Ports
• Supports 4K Ultra HD (UHD) playback with HDMI 1.4 and
DisplayPort 1.2 Ports
Audio • 7.1 CH HD Audio with Content Protection (Realtek
ALC892/897 Audio Codec)
• Supports Surge Protection
LAN • 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
Rear Panel
I/O
• 1 x PS/2 Mouse/Keyboard Port
• 1 x D-Sub Port
• 1 x HDMI Port
• 1 x DisplayPort 1.2
• 2 x USB 2.0 Ports (Supports ESD Protection)
• 1 x USB 3.2 Gen2 Type-A Port (10 Gb/s) (Supports ESD Pro-
tection)
• 1 x USB 3.2 Gen2 Type-C Port (10 Gb/s) (Supports ESD Pro-
tection)
• 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

B450 Pro4 R2.0
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English
Storage • 4 x SATA3 6.0 Gb/s Connectors, support RAID (RAID 0,
RAID 1 and RAID 10), NCQ, AHCI and Hot Plug*
• 2 x SATA3 6.0 Gb/s Connectors by ASMedia ASM1061, sup-
port NCQ, AHCI and Hot Plug
* M2_2, SATA3_3 and SATA3_4 share lanes. If either one of
them is in use, the others will be disabled.
• 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)**
• 1 x M.2 Socket (M2_2), supports M Key type
2230/2242/2260/2280/22110 M.2 SATA3 6.0 Gb/s module and
M.2 PCI Express module up to Gen3 x2 (16 Gb/s) **
** If M2_1 is occupied, PCIE4 will be disabled.
** Supports NVMe SSD as boot disks
** Supports ASRock U.2 Kit
Connector • 1 x COM Port Header
• 1 x TPM 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.
• 1 x CPU/Water Pump Fan Connector (4-pin) (Smart Fan
Speed Control)
* e CPU/Water Pump Fan supports the water cooler fan of
maximum 2A (24W) fan power.
• 3 x Chassis/Water Pump Fan Connectors (4-pin) (Smart Fan
Speed Control)

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* e Chassis/Water Pump Fan supports the water cooler fan of
maximum 2A (24W) fan power.
* CPU_FAN2/WP, CHA_FAN1/WP, CHA_FAN2/WP and
CHA_FAN3/WP 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
• 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)
BIOS
Feature
• 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
Hardware
Monitor
• Temperature Sensing: CPU, MB
• Fan Tachometer: CPU, CPU/Water Pump, Chassis/Water
Pump Fans
• Quiet Fan (Auto adjust chassis fan speed by CPU tempera-
ture): CPU, CPU/Water Pump, Chassis/Water Pump Fans
• Fan Multi-Speed Control: CPU, CPU/Water Pump, Chassis/
Water Pump Fans
• Voltage monitoring: +12V, +5V, +3.3V, Vcore
OS • Microso® Windows® 10 64-bit
Certica-
tions
• FCC, CE
• ErP/EuP ready (ErP/EuP ready power supply is required)
* For detailed product information, please visit our website: http://www.asrock.com
Please realize that there is a certain risk involved with overclocking, including adjust-
ing the setting in the BIOS, applying Untied Overclocking Technology, or using third-
party 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 caused by overclocking.

B450 Pro4 R2.0
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1.3 Motherboard Layout
34
2
6
5
7
8
10
11
1
15
16
18
17
13
12
19
14
21
20
22
25
BIOS
ROM
ATXPWR1
Super
I/O
CLRCMOS2
1
1
USB_3_4
HD_AUDIO1
1
Top:
LINE IN
Center:
FRONT
Bottom:
MIC IN
RJ-45 LAN
SOCKETAM4
1
COM1
HDMI1
CMOS
Battery
ATX12V1
M2_1
Ultra M.2
PCIe Gen3 x4
USB3_5_6
1
CHA_FAN1/WP
HDLED RESET
PLED PWRBTN
PANEL1
1
RoHS
SPK_PLED1
1
DDR4_A1 (64 bit, 288-pin module)
DDR4_A2 (64 bit, 288-pin module)
DDR4_B1 (64 bit, 288-pin module)
DDR4_B2 (64 bit, 288-pin module)
PCIE1
M2_2
AMD
Promontory
B450
USB 3.2 Gen1
T: USB1
B: USB2
USB 3.2 Gen1
T: USB3
B: USB4
AMD_FAN_LED1
1
1
USB_1_2
TPMS1
1
SATA3_1
SATA3_2
SATA3_A1
B450 Pro4
PCIE2
PCIE3
PCIE5
PCIE6
PCIE4
CHA_FAN2/WP CHA_FAN3/WP
SATA3_A2
SATA3_3
SATA3_4
USB 3.2 Gen2
T: USB31_TA_1
B: USB31_TC_1
USB 2.0
T: USB5
B: USB6
PS2
Keyboard
/Mouse
26
27
VGA1
DISPLAY1
CPU_FAN2/WP
CPU_FAN1
1
ADDR_LED1
1
RGB_LED1
9
23
24

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No. Description
1 ATX 12V Power Connector (ATX12V1)
2 2 x 288-pin DDR4 DIMM Slots (DDR4_A1, DDR4_B1)
3 AMD Fan LED Header (AMD_FAN_LED1)
4 CPU Fan / Waterpump Fan Connector (CPU_FAN2/WP)
5 CPU Fan Connector (CPU_FAN1)
6 ATX Power Connector (ATXPWR1)
7 USB 3.2 Gen1 Header (USB3_5_6)
8 SATA3 Connector (SATA3_2)
9 SATA3 Connector (SATA3_1)
10 2 x 288-pin DDR4 DIMM Slots (DDR4_A2, DDR4_B2)
11 SATA3 Connector (SATA3_A1)
12 SATA3 Connector (SATA3_A2)
13 SATA3 Connector (SATA3_3)
14 SATA3 Connector (SATA3_4)
15 Power LED and Speaker Header (SPK_PLED1)
16 System Panel Header (PANEL1)
17 Chassis Fan / Waterpump Fan Connector (CHA_FAN3/WP)
18 Chassis Fan / Waterpump Fan Connector (CHA_FAN2/WP)
19 Clear CMOS Jumper (CLRCMOS2)
20 Addressable LED Header (ADDR_LED1)
21 USB 2.0 Header (USB_3_4)
22 USB 2.0 Header (USB_1_2)
23 COM Port Header (COM1)
24 RGB LED Header (RGB_LED1)
25 TPM Header (TPMS1)
26 Front Panel Audio Header (HD_AUDIO1)
27 Chassis Fan / Waterpump Fan Connector (CHA_FAN1/WP)

B450 Pro4 R2.0
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1.4 I/O Panel
1
8 7
9
1113
3
6
5
4
10
12
2
No. Description No. Description
1 USB 2.0 Ports (USB56) 8 USB 3.2 Gen1 Ports (USB3_12)
2DisplayPort 1.2 9 USB 3.2 Gen2 Type-A Port (USB31_TA_1)
3 LAN RJ-45 Port* 10 USB 3.2 Gen2 Type-C Port (USB31_TC_1)
4 Line In (Light Blue)** 11 HDMI Port
5 Front Speaker (Lime)** 12 D-Sub Port
6 Microphone (Pink)** 13 PS/2 Mouse/Keyboard Port
7 USB 3.2 Gen1 Ports (USB3_34)
* 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 Description Status Description
O No Link O 10Mbps connection
Blinking Data Activity Orange 100Mbps connection
On Link Green 1Gbps connection
ACT/LINK LED
SPEED LED
LAN Port

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**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

B450 Pro4 R2.0
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is is an 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.
Chapter 2 Installation

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2.1 Installing the CPU
Unplug all power cables before installing the CPU.
2
1
90o

B450 Pro4 R2.0
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3

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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.
Installing the CPU Box Cooler SR1
Please turn o the power or remove the power cord before changing a CPU or heatsink.
1
2