Thank you for purchasing the MSI® B450I GAMING PLUS ACmotherboard. This Quick
Start section provides demonstration diagrams about how to install your computer.
Some of the installations also provide video demonstrations. Please link to the URL to
watch it with the web browser on your phone or tablet. You may have even link to the
URL by scanning the QR code
Preparing Tools and Components
AMD® AM4 CPU
DDR4 Memory
SATA DVD Drive
Phillips Screwdriver
CPU Fan
Power Supply Unit
SATA Hard Disk Drive
A Package of Screws
Thermal Paste
Chassis
Graphics Card
Quick Start
1
Installing a Processor
https://youtu.be/Xv89nhFk1vc
3
2
6
1
5
4
8
9
2
7
Quick Start
Important
If you are installing the screw-type CPU heatsink, please follow the figure below to
remove the retention module first and then install the heatsink.
y The components included in this package are prone to damage from electrostatic
discharge (ESD). Please adhere to the following instructions to ensure successful
computer assembly.
y Ensure that all components are securely connected. Loose connections may cause
the computer to not recognize a component or fail to start.
y Hold the motherboard by the edges to avoid touching sensitive components.
y It is recommended to wear an electrostatic discharge (ESD) wrist strap when
handling the motherboard to prevent electrostatic damage. If an ESD wrist strap is
not available, discharge yourself of static electricity by touching another metal object
before handling the motherboard.
y Store the motherboard in an electrostatic shielding container or on an anti-static pad
whenever the motherboard is not installed.
y Before turning on the computer, ensure that there are no loose screws or metal
components on the motherboard or anywhere within the computer case.
y Do not boot the computer before installation is completed. This could cause
permanent damage to the components as well as injury to the user.
y If you need help during any installation step, please consult a certified computer
technician.
y Always turn off the power supply and unplug the power cord from the power outlet
before installing or removing any computer component.
y Keep this user guide for future reference.
y Keep this motherboard away from humidity.
y Make sure that your electrical outlet provides the same voltage as is indicated on the
PSU, before connecting the PSU to the electrical outlet.
y Place the power cord such a way that people can not step on it. Do not place anything
over the power cord.
y All cautions and warnings on the motherboard should be noted.
y If any of the following situations arises, get the motherboard checked by service
personnel:
Liquid has penetrated into the computer. The motherboard has been exposed to moisture. The motherboard does not work well or you can not get it work according to user
guide.
The motherboard has been dropped and damaged. The motherboard has obvious sign of breakage.
y Do not leave this motherboard in an environment above 60oC (140oF), it may damage
the motherboard.
Safety Information
14
Specifications
CPU
ChipsetAMD
Memory
Expansion Slots
Onboard Graphics
Storage
RAID
®
Support AMD
Radeon™ Vega Graphics Processors for Socket AM4
y 1x HDMIy 4x USB 3.1 Gen1 Type-A portsy 1x LAN (RJ45) porty 2x WiFi Antenna connectorsy 3x audio jacks
Continued on next page
®
8111HGigabit LAN controller
®
4.2, 4.1, BLE, 4.0, 3.0, 2.1, 2.1+EDR
®
ALC887 Codec
™
port
16
Specifications
Internal Connectors
I/O Controller
Hardware Monitor
Form Factor
BIOS Features
Continued from previous page
1x 24-pin ATX main power connector
yy 1x 8-pin ATX 12V power connectory 4x SATA 6Gb/s connectorsy 1x USB 2.0 connector (support additional 2 USB 2.0 ports)y 1x USB 3.1 Gen1 connectors (support additional 2 USB 3.1
Gen1 ports)
y 1x 4-pin CPU fan connectory 1x 4-pin system fan connectory 1x Front panel audio connectory 2x System panel connectorsy 1x Chassis Intrusion connectory 1x Clear CMOS jumpery 2x 5050 RGB LED strip 12V connectors
NUVOTON NCT6795D Controller Chip
y
CPU/System temperature detection
y CPU/System fan speed detectiony CPU/System fan speed control
y
Mini-ITX Form Factor
y 6.7 in. x 6.7 in. (17.0 cm x 17.0 cm)
1x 128 Mb flash
yy UEFI AMI BIOSy ACPI 6.1, SM BIOS 2.8y
Multi-language
Continued on next page
Specifications
17
Special Features
Continued from previous page
Audio
y
Audio Boost
y Storage
Turbo M.2 StoreMI
y Fan
GAMING Fan Control
y LED
Mystic Light Extension Mystic light SYNC EZ DEBUG LED
APP MANAGER
y SUPER CHARGERy COMMAND CENTERy LIVE UPDATE 6y SMART TOOL
Software
y RAMDISKy X-BOOSTy GAMING APPy MYSTIC LIGHTy Open Broadcaster Software (OBS)y CPU-Z MSI GAMING
™
y Norton
Internet Security Solution
y Google Chrome
™
, Google Toolbar, Google Drive
Package contents
Please check the contents of your motherboard package. It should contain:
y Motherboardy Driver DVDy User Manualy Quick Installation Guidey I/O Shieldingy Antenna x2y SATA 6G Cable x2 y Case Badgey VIP cardy M.2 Screw x1
Important
If any of the above items are damaged or missing, please contact your retailer.
Specifications
19
Block Diagram
PCI Express Bus
NV6795
Super I/O
PS/2 Mouse / Keyboard
HDMIDisplayPort
2 Channel DDR4 Memory
CPU
PCI Express Bus
Realtek
ALC887
Audio Jacks
4 x USB 3.1 Gen1
20
Block Diagram
1 x M.2
4 x USB 2.0
4x SATA 6Gb/s
CHIPSET
2 x USB 3.1 Gen1
Rear I/O Panel
USB 2.0 Type-A
DisplayPort
USB 3.1 Gen1
Type-A
LAN
Wi-Fi Antenna
connectors
Line-In
Line-Out
Mic-In
PS/2
USB 3.1 Gen1
Type-A
LAN Port LED Status Table
Link/ Activity LED
StatusDescription
OffNo link
YellowLinked
BlinkingData activity
Audio 7.1-channel Configuration
To configure 7.1-channel audio, you have to connect front audio I/O module to JAUD1
connector and follow the below steps.
1. Click on the Realtek HD Audio Manager > Advanced Settings to open the dialog
below.
2. Select Mute the rear output device, when a front headphone plugged in.
3. Plug your speakers to audio jacks on rear and front I/O panel. When you plug into
a device at an audio jack, a dialogue window will pop up asking you which device is
current connected.
Speed LED
StatusDescription
Off10 Mbps connection
Green100 Mbps connection
Orange1 Gbps connection
Rear I/O Panel
21
Installing antennas
1. Screw the antennas tight to the antenna connectors as shown below.
2. Orient the antennas.
1
2
22
Rear I/O Panel
Overview of Components
Top Vie w
Processor Socket
CPU_PWR1
SYS_FAN1
CPU_FAN1
DIMMA1
DIMMB1
JUSB2
JUSB1
ATX_PWR1
JBAT1
JFP2
JAUD1
Bottom View
M2_1
SATA4
SATA2
SATA3
SATA1
JRGB2
JRGB1
PCI_E1JCI1JFP1
Overview of Components
23
Component Contents
Port NamePort TypePage
CPU_FAN1, SYS_FAN1Fan Connectors31
CPU_PWR1, ATX_PWR1Power Connectors29
DIMMA1, DIMMB1DIMM Slots26
JAUD1Front Audio Connector31
JBAT1Clear CMOS Jumper33
JCI1Chassis Intrusion Connector32
JFP1, JFP2Front Panel Connectors29
JRGB1~2RGB LED Connectors33
JUSB1USB 2.0 Connector30
JUSB2USB 3.1 Gen1 Connector30
M2_1M.2 Slot (Key M)28
PCI_E1PCIe Expansion Slot27
Processor SocketAM4 socket25
SATA1~4SATA 6Gb/s Connectors27
Overview of Components
24
Processor Socket
Distance from the center of the
CPU to the nearest DIMM slot.
51.4mm
Introduction to the AM4 CPU
The surface of the AM4 CPU has a
yellow triangle to assist in correctly
lining up the CPU for motherboard
placement. The yellow triangle is
the Pin 1 indicator.
Important
y
When changing the processor, the system configuration could be cleared and reset
BIOS to default values, due to the AM4 processors architecture.
y
Always unplug the power cord from the power outlet before installing or removing
the CPU.
y
When installing a CPU, always remember to install a CPU heatsink. A CPU heatsink
is necessary to prevent overheating and maintain system stability.
y
Confirm that the CPU heatsink has formed a tight seal with the CPU before booting
your system.
y
Overheating can seriously damage the CPU and motherboard. Always make sure
the cooling fans work properly to protect the CPU from overheating. Be sure to apply
an even layer of thermal paste (or thermal tape) between the CPU and the heatsink to
enhance heat dissipation.
y
If you purchased a separate CPU and heatsink/ cooler, Please refer to the
documentation in the heatsink/ cooler package for more details about installation.
Overview of Components
25
DIMM Slots
DIMMA1DIMMB1
Channel AChannel B
Memory module installation recommendation
DIMMA1DIMMB1
DIMMA1
Important
y
Always insert memory modules in the DIMMA1 slot first.
y
Due to chipset resource usage, the available capacity of memory will be a little less
than the amount of installed.
y
Based on processor specification, the Memory DIMM voltage below 1.35V is
suggested to protect the processor.
y
Some memory modules may operate at a lower frequency than the marked value
when overclocking due to the memory frequency operates dependent on its Serial
Presence Detect (SPD). Go to BIOS and find the DRAM Frequency! to set the memory
frequency if you want to operate the memory at the marked or at a higher frequency.
y
It is recommended to use a more efficient memory cooling system for full DIMMs
installation or overclocking.
y
The stability and compatibility of installed memory module depend on installed CPU
and devices when overclocking.
y
Due to AM4 processor/memory controller official specification limitation, the
frequency of memory modules may operate lower than the marked value under the
default state. Please refer www.msi.com for more information on compatible memory.
Overview of Components
26
PCI_E1: PCIe Expansion Slot
PCI_E1: PCIe 3.0 x16*/ PCIe x8 **
(CPU lanes)
* For Ryzen™ 1st and 2nd Generation processors
** For Ryzen™ with Radeon Vega Graphics processors
Important
y
If you install a large and heavy graphics card, you need to use a tool such as MSI Gaming Series Graphics Card Bolster to support its weight to prevent deformation of
the slot.
y
When adding or removing expansion cards, always turn off the power supply and
unplug the power supply power cable from the power outlet. Read the expansion
cards documentation to check for any necessary additional hardware or software
changes.
SATA1~4: SATA 6Gb/s Connectors
These connectors are SATA 6Gb/s interface ports. Each connector can connect to one
SATA device.
SATA 4
SATA 3
SATA 2
SATA 1
Important
y
Please do not fold the SATA cable at a 90-degree angle. Data loss may result during
transmission otherwise.
y
SATA cables have identical plugs on either sides of the cable. However, it is
recommended that the flat connector be connected to the motherboard for space
saving purposes.
Overview of Components
27
M2_1: M.2 Slot (Key M)
Video Dem onstration
Watch the video to learn how to use M.2
Shield.
https://youtu.be/NwtQBpkUazs
Bottom view
Install ing M.2 SSD
1. Loosen the M.2 riser screw from the motherboard.
2. Insert your M.2 SSD into the M.2 slot at a 30-degree angle.
3. Secure the M.2 SSD in place with the supplied M.2 screw.
Supplied
M.2 screw
1
Overview of Components
28
30o
2
3
JFP1, JFP2: Front Panel Connectors
These connectors connect to the switches and LEDs on the front panel.
1HDD LED +2Power LED +
3HDD LED -4Power LED -
5Reset Switch6Power Switch
7Reset Switch8Power Switch
9Reserved10No Pin
1
JFP2
1Speaker -2Buzzer +
3Buzzer -4Speaker +
210
JFP1
1
9
CPU_PWR1, ATX_PWR1: Power Connectors
These connectors allow you to connect an ATX power supply.
5
8
41
1Ground5+12V
2Ground6+12V
3Ground7+12V
4Ground8+12V
1+3.3V13+3.3V
2+3.3V14-12V
24
12
ATX_PWR1
131
3Ground15Ground
4+5V16PS-ON#
5Ground17Ground
6+5V18Ground
7Ground19Ground
8PWR OK20Res
95VSB21+5V
10+12V22+5V
11+12V23+5V
12+3.3V24Ground
CPU_PWR1
Important
Make sure that all the power cables are securely connected to a proper ATX power
supply to ensure stable operation of the motherboard.
Overview of Components
29
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