ASROCK B550 Phantom Gaming-ITX/ax User manual

Version 1.0
Published May 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.

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

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B550 Phantom Gaming-ITX/ax
Motherboard Layout
Top Side View

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Back Side View

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B550 Phantom Gaming-ITX/ax
No. Description
1 ATX 12V Power Connector (ATX12V1)
2 CPU Fan Connector (CPU_FAN1)
3 Addressable LED Header (ADDR_LED1)
4 RGB LED Header (RGB_LED1)
5 CPU/Water Pump Fan Connector (CPU_FAN2/WP)
6 2 x 288-pin DDR4 DIMM Slots (DDR4_A1, DDR4_B1)
7 ATX Power Connector (ATXPWR1)
8 SATA3 Connectors (SATA3_1_2)
9 SATA3 Connectors (SATA3_3_4)
10 USB 3.2 Gen1 Header (USB3_5_6)
11 System Panel Header (PANEL1)
12 USB 2.0 Header (USB_1_2)
13 Front Panel Type C USB 3.2 Gen2 Header (USB32_TC_2)
14 Clear CMOS Jumper (CLRCMOS1)
15 Chassis/Water Pump Fan Connector (CHA_FAN1/WP)
16 Chassis Speaker Header (SPEAKER1)
17 Front Panel Audio Header (HD_AUDIO1)

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I/O Panel
No. Description No. Description
1 2.5G LAN RJ-45 Port (Intel® I225V)* 6 Antenna Ports
2USB 3.2 Gen2 Type-A Port
(USB32_TA_1) 7 Microphone (Pink)**
3 DisplayPort 1.4 8 USB 3.2 Gen1 Ports
4 Line In (Light Blue)** 9 HDMI Port
5 Front Speaker (Lime)** 10 USB 3.2 Gen2 Type-C Port
(USB32_TC_1)
ACT/LINK LED
SPEED LED
LAN Port
* 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/1Gbps connection
On Link Green 2.5Gbps connection
7
5
4
6
9
3
8
2
1
10
** 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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B550 Phantom Gaming-ITX/ax
WiFi-802.11ax Module and ASRock WiFi 2.4/5 GHz Antenna
WiFi-802.11ax + BT Module
is motherboard comes with an exclusive WiFi 802.11 a/b/g/n/ax + BT v5.1 module
(pre-installed on the rear I/O panel) that oers support for WiFi 802.11 a/b/g/n/
ax connectivity standards and Bluetooth v5.1. WiFi + BT module is an easy-to-use
wireless local area network (WLAN) adapter to support WiFi + BT. Bluetooth v5.1
standard features Smart Ready technology that adds a whole new class of functionality
into the mobile devices. BT 5.1 also includes Low Energy Technology and ensures
extraordinary low power consumption for PCs. e 2T2R WiFi solution sets a WiFi
high speed standard and oers max link rate up to 2.4Gbps.
* e transmission speed may vary according to the environment.
ASRock WiFi 2.4/5 GHz Antenna

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Chapter 1 Introduction
ank you for purchasing ASRock B550 Phantom Gaming-ITX/ax 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.
1.1 Package Contents
• ASRock B550 Phantom Gaming-ITX/ax Motherboard (Mini-ITX Form Factor)
• ASRock B550 Phantom Gaming-ITX/ax Quick Installation Guide
• ASRock B550 Phantom Gaming-ITX/ax Support CD
• 2 x Serial ATA (SATA) Data Cables (Optional)
• 1 x Screw for M.2 Socket (Optional)
• 1 x ASRock WiFi 2.4/5 GHz Antenna (Optional)
Because the motherboard specications and the BIOS soware might be updated, the
content of this documentation will be subject to change without notice. In case any
modications of this documentation 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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B550 Phantom Gaming-ITX/ax
1.2 Specications
Platform • Mini-ITX Form Factor
• 8 Layer PCB
• 2oz Copper PCB
CPU • Supports 3rd Gen AMD AM4 RyzenTM / future AMD RyzenTM
Processors (3000 and 4000 Series Processors)*
* Not compatible with AMD RyzenTM 5 3400G and RyzenTM 3
3200G.
• Digi Power design
• 8 Power Phase design
Chipset • AMD B550
Memory • Dual Channel DDR4 Memory Technology
• 2 x DDR4 DIMM Slots
• AMD Ryzen series CPUs (Matisse) support DDR4 4733+
(OC)/4666(OC)/4600(OC)/4533(OC)/4466(OC)/4400
(OC)/4333(OC)/4266(OC)/4200(OC)/4133(OC)/4000
(OC)/3866(OC)/3800(OC)/3733(OC)/3600(OC)/3466
(OC)/3200/2933/2667/2400/2133 ECC & non-ECC, un-
buered memory*
• AMD Ryzen series APUs (Renoir) support DDR4 4733+
(OC)/4666(OC)/4600(OC)/4533(OC)/4466(OC)/4400
(OC)/4333(OC)/4266(OC)/4200(OC)/4133(OC)/4000
(OC)/3866(OC)/3800(OC)/3733(OC)/3600(OC)/3466
(OC)/3200/2933/2667/2400/2133 ECC & non-ECC, un-
buered memory*
* Please refer to Memory Support List on ASRock’s website for
more information. (http://www.asrock.com/)
* Please refer to page 23 for DDR4 UDIMM maximum
frequency support.
• Max. capacity of system memory: 64GB
• Supports Extreme Memory Prole (XMP) memory modules
• 15μ Gold Contact in DIMM Slots

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Expansion
Slot
AMD Ryzen series CPUs (Matisse)
• 1 x PCI Express x16 Slot (PCIE1: Gen4x16 mode)*
AMD Ryzen series APUs (Renoir)
• 1 x PCI Express x16 Slot (PCIE1: Gen3x16 mode)*
* Supports NVMe SSD as boot disks
• 1 x Vertical M.2 Socket (Key E) with the bundled WiFi-
802.11ax module (on the rear I/O)
• 15μ Gold Contact in VGA PCIe Slot (PCIE1)
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.
• Dual graphics output: support HDMI and DisplayPort 1.4
ports by independent display controllers
• Supports HDMI 2.1 with max. resolution up to 4K x 2K
(4096x2160) @ 60Hz
• Supports DisplayPort 1.4 with max. resolution up to 5K
(5120x2880)@120Hz
• Supports Auto Lip Sync, Deep Color (12bpc), xvYCC and
HBR (High Bit Rate Audio) with HDMI 2.1 Port (Compliant
HDMI monitor is required)
• Supports HDR (High Dynamic Range) with HDMI 2.1
• Supports HDCP 2.3 with HDMI 2.1 and DisplayPort 1.4
Ports
• Supports 4K Ultra HD (UHD) playback with HDMI 2.1 and
DisplayPort 1.4 Ports
• Supports Microso PlayReady®
Audio • 7.1 CH HD Audio with Content Protection (Realtek
ALC1220 Audio Codec)
• Premium Blu-ray Audio support
• Supports Surge Protection
• 120dB SNR DAC with Dierential Amplier
• Pure Power-In
• Direct Drive Technology

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B550 Phantom Gaming-ITX/ax
• PCB Isolate Shielding
• Impedance Sensing on Rear Out port
• Individual PCB Layers for R/L Audio Channel
• 15μ Gold Audio Connector
• Nahimic Audio
LAN • 2.5 Gigabit LAN 10/100/1000/2500 Mb/s
• GigaLAN Intel® I225V
• Supports Wake-On-LAN
• Supports Lightning/ESD Protection
• Supports Energy Ecient Ethernet 802.3az
• Supports PXE
Wireless
LAN
• Intel® 802.11ax WiFi Module
• Supports IEEE 802.11a/b/g/n/ax
• Supports Dual-Band (2.4/5 GHz)
• Supports WiFi6 802.11ax (2.4Gbps)
• 2 antennas to support 2 (Transmit) x 2 (Receive) diversity
technology
• Supports Bluetooth 5.1 + High speed class II
• Supports MU-MIMO
Rear Panel
I/O
• 2 x Antenna Ports
• 1 x HDMI Port
• 1 x DisplayPort 1.4
• 1 x USB 3.2 Gen2 Type-A Port (10 Gb/s) (Supports ESD
Protection)
• 1 x USB 3.2 Gen2 Type-C Port (10 Gb/s) (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 Hyper M.2 Socket (M2_1), supports M Key type 2280 M.2
PCI Express module up to Gen4x4 (64 Gb/s) (with Matisse)
or Gen3x4 (32 Gb/s) (with Renoir)*

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• 1 x M.2 Socket, supports M Key type 2280 M.2 SATA3 6.0
Gb/s module and M.2 PCI Express module up to Gen3 x4 (32
Gb/s)*
* Supports NVMe SSD as boot disks
* Supports ASRock U.2 Kit (M2_1)
Connector • 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 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)
• 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.
* CPU_FAN2/WP and CHA_FAN1/WP can auto detect if 3-pin
or 4-pin fan is in use.
• 1 x 24 pin ATX Power Connector (Hi-Density Power Con-
nector)
• 1 x 8 pin 12V Power Connector (Hi-Density Power Connec-
tor)
• 1 x Front Panel Audio Connector (15μ Gold Audio Connec-
tor)
• 1 x USB 2.0 Header (Supports 2 USB 2.0 ports) (Supports
ESD Protection)
• 1 x USB 3.2 Gen1 Header (Supports 2 USB 3.2 Gen1 ports)
(Supports ESD Protection)
• 1 x Front Panel Type C USB 3.2 Gen2 Header (Supports ESD
Protection)

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B550 Phantom Gaming-ITX/ax
BIOS
Feature
• AMI UEFI Legal BIOS with GUI support
• Supports “Plug and Play”
• ACPI 5.1 compliance wake up events
• Supports jumperfree
• SMBIOS 2.3 support
• CPU, CPU VDDCR_SOC, DRAM, VPPM, Chipset 1.05V,
2.50V, +1.8V, VDDP Voltage Multi-adjustment
Hardware
Monitor
• Temperature Sensing: CPU, CPU/Water Pump, Chassis/Wa-
ter Pump Fans
• 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, CPU Vcore
OS • Microso® Windows® 10 64-bit
Certica-
tions
• FCC, CE
• ErP/EuP ready (ErP/EuP ready power supply is required)
Please realize that there is a certain risk involved with overclocking, including
adjusting 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.
* For detailed product information, please visit our website: http://www.asrock.com

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is is a Mini-ITX 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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B550 Phantom Gaming-ITX/ax
2.1 Installing the CPU
Unplug all power cables before installing the CPU.
2
1

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3

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B550 Phantom Gaming-ITX/ax
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

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3
4
CPU_FAN1