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MSI · AM4 · B550

MSI B550-A PRO ProSeries

ATX · DDR4 · 4 DIMMs · 10-phase VRM

Quality
49
VRM
30
Value
74
Amazon
$126
MSI B550-A PRO ProSeries
View MSI B550-A PRO ProSeries Gallery in high resolution
$126
Unavailable Updated 2 weeks, 3 days ago Prime FBA
Overall49.4
VRM30.0
Chipset81.0
Expansion / storage58.0
Connectivity33.0
Audio45.0
Quality / price74.5
$126 on Amazon Motherboard table Compare this motherboard

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Written analysis

MSI B550-A PRO ProSeries at a glance

The MSI B550-A PRO ProSeries uses the ATX form factor, AM4 socket, and B550-A chipset. This is a balanced mainstream platform: enough expansion and connectivity for a performance PC without paying only for flagship extras.

Memory support is DDR4 across 4 DIMM slots, with up to 128 GB and rated overclocked speeds up to 4800 MT/s. ECC modules are accepted, subject to CPU support. XMP / EXPO memory-profile support is recorded for easier tuning.

Best fit: a mainstream gaming, home, or office system with moderate expansion needs.

Power delivery

The calculated VRM score is 30.0, placing the power delivery in the entry-level class. The board lists 10 CPU power phases, 60 A power stages in a 10+2+1 layout. CPU power input is listed as 1. It is best paired with mainstream 65–105 W-class processors and good case airflow.

Expansion and storage

The expansion and storage score is 58.0: balanced . The platform supports PCIe 4.0. Physical expansion includes 2 ×16 slots, and 2 ×1.

On-board storage consists of 2 M.2 slots supporting PCIe 4.0 x4, PCIe 3.0 x4 and 6 SATA ports. Supported M.2 lengths are listed as 22110, 2280, 2260, 2242. The two-slot layout covers a typical OS-and-games or OS-and-project-drive setup.

Connectivity and rear I/O

The connectivity score is 33.0, rated essential. There is no recorded onboard Wi-Fi ; wired networking is 1x Realtek® 8111H Gigabit LAN controller at up to 1000 Mbps. The recorded USB provision is 8 rear connections and 1 front-panel connections. The specification sheet below separates every USB speed and connector type.

Display connectivity includes HDMI 2.1, DisplayPort. These motherboard outputs require a processor with integrated graphics.

Audio

The audio score is 45.0. This is a standard onboard solution using Realtek® ALC892/ALC897 Codec. It covers normal gaming and communication; demanding headphones or production work still benefit from an external interface.

Buying verdict

Overall quality is 49.40, a basic but usable result for office, media, and budget gaming systems.

At the recorded Amazon price, the quality-to-price score is 74.5—an excellent value relative to the other boards in the catalog.

Board data

Full specifications

Platform, expansion, storage, rear I/O, internal headers, networking, audio, and board controls in one sheet.

General

Manufacturer
MSI
Motherboard
MSI B550-A PRO ProSeries
Chipset / socket
B550-A / AM4
Form factor
ATX
Launch price
—
Amazon price
$126
Availability
Unavailable
Price updated
2 weeks, 3 days ago

VRM

CPU phases
10 (60 A)
Power design
10+2+1
EPS connector
1

Memory

Type / slots
DDR4 / 4 DIMMs
Max capacity / OC
128 GB / 4800 MT/s
XMP / EXPO
Yes
ECC
Modules supported

PCIe

Supported version
PCIe 4.0
x16 physical
2
x16 Gen 4
1
x16 Gen 3
1
x1 physical
2
x1 Gen 3
2

Storage

M.2 slots
2
M.2 lengths
22110, 2280, 2260, 2242
M.2 modes
PCIe 4.0 x4, PCIe 3.0 x4
SATA ports
6

Display outputs

HDMI
Yes · 2.1 · 4096x2160 @60Hz
DisplayPort
Yes · 4096x2160 @60Hz
USB-C DisplayPort
No

USB

Rear USB 2.0
4
Rear USB 3.2 Gen 1 Type-A 5 Gbps
2
Rear USB 3.2 Gen 2 Type-A 10 Gbps
1
Rear USB 3.2 Gen 2 Type-C 10 Gbps
1
Front USB 3.2 Gen 1 Type-C 5 Gbps
1
Header USB 2.0
4
Header USB 3.2 Gen 1 Type-A 5 Gbps
2

Networking

Ethernet
1x Realtek® 8111H Gigabit LAN controller
LAN ports
1
LAN speed
1000 Mbps
Wi-Fi
Not included
Bluetooth
No

Audio

Chipset
Realtek® ALC892/ALC897 Codec
Analog jacks
—
Gold-plated jacks
No
Optical S/PDIF
No
Spatial audio
No

Buttons

BIOS flashback
Yes
Clear CMOS
No
Q-Flash Plus
No
Smart button
No
Onboard start / reset
No

Additional information

Memory notes
Supports DDR4. JEDEC speeds: 1866/ 2133/ 2400/ 2667/ 2800/ 2933/ 3000/ 3066/ 3200 MHz. A-XMP OC MODE speeds: 2667/ 2800 /2933 /3000 /3066 /3200 /3466 /3600/ 3733 /3866 /4000 /4133 /4266 /4400+ MHz. Max speed varies by configuration: 1DPC 1R up to 4800 MHz, 1DPC 2R up to 3866 MHz, 2DPC 1R up to 4000 MHz, 2DPC 2R up to 3600 MHz. Supports un-buffered UDIMM memory. ECC UDIMM memory is supported but operates in non-ECC mode.
Display notes
Supports HDCP 1.4 & 2.3. Maximum shared memory of 16 GB.
Expansion notes
PCI_E3 slot supports x4 speed. The supported specification depends on installed processor. When installing PCIe SSD in M.2_2, PCI_E3 slot will be unavailable.
M2_1
4.0/3.0 4 · SATA · 2242, 2260, 2280, 22110 · AMD Processor
M2_2
3.0 4 · 2242, 2260, 2280 · AMD B550 chipset
Storage notes
M.2 slots are Key M.
Audio notes
7.1-Channel High Definition Audio
Button notes
The text lists a 'Flash BIOS Button'. It also mentions a 'Clear CMOS jumper', which is not a button.
Fan / RGB headers
1 CPU · — OPT · 1 AIO · 6 chassis · 2 ARGB · 1 RGB
Other headers
Front audio · System panel · TPM
Dimensions
30.5 cm x 24.4 cm

Extracted notes sit here. Official manufacturer copy is at the bottom of the page.

Amazon

Price history

Nearby quality

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VRM fit

VRM-appropriate CPUs

AM4 processors whose TDP sits in this board’s VRM window. Socket match is required; chipset extras still matter on sTR5. This is a power-delivery filter, not a ranked CPU guide.

Open AM4 CPUs in the CPU table

Discussion

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Vendor copy

Official manufacturer data

Raw manufacturer text kept for reference. Structured specs above are extracted from this copy and are the source for scores and tables.

Memory

4x DDR4 memory slots, support up to 128GB 1
Supports DDR4 1866/ 2133/ 2400/ 2667/ 2800/ 2933/ 3000/ 3066/ 3200 MHz by JEDEC
Supports DDR4 2667/ 2800 /2933 /3000 /3066 /3200 /3466 /3600/ 3733 /3866 /4000 /4133 /4266 /4400+ MHz by A-XMP OC MODE
1DPC 1R Max speed 4800 MHz
1DPC 2R max speed 3866 MHZ
2DPC 1R max speed 4000 MHZ
2DPC 2R max speed 3600 MHZ
Dual channel memory architecture
Supports non-ECC UDIMM memory
Supports ECC UDIMM memory (non-ECC mode)
Supports un-buffered memory

Graphics

1x HDMI™ 2.1 port, supports a maximum resolution of 4096x2160 @60Hz 1 2
Support HDCP 1.4 & 2.3
1x DisplayPort, supports a maximum resolution of 4096x2160 @60Hz 1
Maximum shared memory of 16 GB

Expansion slots

1x PCIe 4.0/ 3.0 x16 slot (PCI_E1) 1
1x PCIe 3.0 x16 slot (PCI_E3), supports x4 speed 2
2x PCIe 3.0 x1 slots
The supported specification depends on installed processor.
When installing PCIe SSD in M.2_2, PCI_E3 slot will be unavailable.

Storage

AMD B550 Chipset
6x SATA 6Gb/s ports
2x M.2 slots (Key M)
M2_1 slot (from AMD Processor)
Supports PCIe 4.0/ 3.0 x4 1
Supports SATA 6Gb/s
Supports 2242/ 2260/ 2280/ 22110 storage devices
M2_2 slot (from AMD B550 chipset)
Supports PCIe 3.0x4
Supports 2242/ 2260/ 2280 storage devices

USB

AMD B550 Chipset
3x USB 3.2 Gen 1 5Gbps ports (1 Type-C internal connector, and 2 ports are available through the internal USB 3.2 Gen 1 5Gbps connector)
8x USB 2.0 ports (4 Type-A ports on the back panel, 4 ports through the internal USB 2.0 connectors)
AMD Processor
2x USB 3.2 Gen 2 10Gbps ports (1 Type-C port and 1 Type-A port on the back panel)
2x USB 3.2 Gen 1 5Gbps Type-A ports on the back panel

Internal I/O

1x 24-pin ATX main power connector
1x 8-pin ATX 12V power connector
6x SATA 6Gb/s connectors
2x M.2 slots (M-Key)
1x USB 3.2 Gen 1 5Gbps Type-C port
1x USB 3.2 Gen 1 5Gbps connector (supports additional 2 USB 3.2 Gen 1 5Gbps ports)
2x USB 2.0 connectors (supports additional 4 USB 2.0 ports)
1x 4-pin CPU fan connector
1x 4-pin water-pump fan connector
6x 4-pin system fan connectors
1x Front panel audio connector
2x System panel connectors
1x Chassis Intrusion connector
1x 4-pin RGB LED connector
2x 3-pin RAINBOW LED connectors
1xTPM module connector
1x Clear CMOS jumper

Rear I/O

Keyboard / Mouse
DisplayPort
LAN
HD Audio Connectors
Flash BIOS Button
USB 2.0
HDMI™
USB 2.0
USB 3.2 Gen 1 5Gbps Type-A
USB 3.2 Gen 2 10Gbps Type-A+C

Audio

Realtek® ALC892/ALC897 Codec
7.1-Channel High Definition Audio

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