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MOTHERBOARDS · YOUR NEXT FACE-OFF

ASUS ROG STRIX B550-A GAMING vs MSI B550-A PRO

Real specs. Clear sources.Exact models · UK & US buying links

Compared products

YOUR FIRST CHOICE

ASUS ROG STRIX B550-A GAMING

UK manufacturer specification · ROG STRIX B550-A GAMING

ASUS ROG STRIX B550-A GAMING official product image
Exact model & source notes

ROG STRIX B550-A GAMING motherboard, identified in the ASUS UK catalogue. Specifications below retain the manufacturer’s configuration and interface conditions.

Specifications checked 17 Oct 2026.

Amazon links open search results. Check the exact variant, current price and availability with the retailer.

Manufacturer specifications
WHAT DIFFERS

4 verified differences, led by Memory type, slots and limit, storage interfaces and restrictions and network interfaces and requirements. Compared in full below. Not a rating.

See the 4 verified differences
THE CONTENDER

MSI B550-A PRO

AM4 · ATX · DDR4 · board-only configuration · MSI global specification

MSI B550-A PRO motherboard, top view of the exact global model; CPU and memory are not installed
Exact model & source notes

An ATX AM4 motherboard with AMD B550: four DDR4 slots rated up to DDR4-4800 (OC), a PCIe 4.0 x16 graphics slot, two M.2 slots (one PCIe 4.0 x4), six SATA ports and Realtek 1 Gb Ethernet.

Specifications checked 7 Sept 2026.

Amazon links open search results. Check the exact variant, current price and availability with the retailer.

Manufacturer specifications

ASUS ROG STRIX B550-A GAMING UK & US retailers

UK & US price history: no verified listing yet

MSI B550-A PRO UK & US retailers

UK & US price history: no verified listing yet

Search links open retailer results, not a matched listing; eBay listings are checked daily. As an Amazon Associate I earn from qualifying purchases. As an eBay Partner, we may be compensated if you make a purchase.

THE DIFFERENCES, MADE VISIBLE

Visual facts

Differences first. Select a topic for its graphic, sources and conditions.

How to read this comparison
  • Manufacturer facts for the exact models shown. Not a quality rating or a test result.
  • “Different” means the known values differ, not that one is better.
  • Missing or conflicting evidence is marked and never counts as a difference. Source chips hold each fact’s sources and conditions.
SPECIFICATIONS SIDE BY SIDE4 topics
SELECTED TOPIC
01 / 04

Memory type, slots and limit

Check the exact configuration and source conditions for your use.

ASUS ROG STRIX B550-A GAMINGAMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors 4 x DIMM, Max. 128GB, DDR4 4600(O.C)/4400(O.C)/4133(O.C.)/4000(O.C.)/3866(O.C.)/3600(O.C.)/3466(O.C.)/3200/3000/2800/2666/2400/2133 MHz Un-buffered Memory AMD RyzenTM 4000 G-Series Processors 4 x DIMM, Max. 128GB, DDR4 5100(O.C)/4800(O.C.)/4600(O.C)/4400(O.C)/4133(O.C.)/4000(O.C.)/3866(O.C.)/3600(O.C.)/3466(O.C.)/3200/3000/2800/2666/2400/2133 MHz Un-buffered Memory Dual Channel Memory Architecture OptiMem II ECC Memory (ECC mode) support varies by CPU. * Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists).

Manufacturer specification

MSI B550-A PRO4 DDR4 DIMM slots; dual channel; up to 128 GB; up to DDR4-4800 (OC); A-XMP; non-ECC unbuffered

The overclocked speed is MSI's 1DPC 1R maximum (MSI's A-XMP speed list itself runs to 4400+ MHz); MSI lists 1DPC 2R up to 3866, 2DPC 1R up to 4000 and 2DPC 2R up to 3600 MHz. JEDEC speeds run up to DDR4-3200. · Manufacturer specification · CPU, BIOS and validated DIMM population determine supported capacity and speeds. DDR4 and DDR5 are not interchangeable.

Explore the full specifications

Plan the complete platform. Check the exact CPU-support list, required BIOS and memory validation before buying. PCIe generations and lane allocations can change with the processor. A socket match or slot count is not a guarantee that every component works together at its highest advertised setting.

WHAT CHANGES BETWEEN THEM?

Key differences

Full specifications ↓

4 verified differences, most decision-relevant first. All are also drawn in Visual facts above. Missing information stays separate.

Memory type, slots and limit

In Visual facts
ASUS ROG STRIX B550-A GAMINGAMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors 4 x DIMM, Max. 128GB, DDR4 4600(O.C)/4400(O.C)/4133(O.C.)/4000(O.C.)/3866(O.C.)/3600(O.C.)/3466(O.C.)/3200/3000/2800/2666/2400/2133 MHz Un-buffered Memory AMD RyzenTM 4000 G-Series Processors 4 x DIMM, Max. 128GB, DDR4 5100(O.C)/4800(O.C.)/4600(O.C)/4400(O.C)/4133(O.C.)/4000(O.C.)/3866(O.C.)/3600(O.C.)/3466(O.C.)/3200/3000/2800/2666/2400/2133 MHz Un-buffered Memory Dual Channel Memory Architecture OptiMem II ECC Memory (ECC mode) support varies by CPU. * Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists).
MSI B550-A PRO4 DDR4 DIMM slots; dual channel; up to 128 GB; up to DDR4-4800 (OC); A-XMP; non-ECC unbuffered
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

The overclocked speed is MSI's 1DPC 1R maximum (MSI's A-XMP speed list itself runs to 4400+ MHz); MSI lists 1DPC 2R up to 3866, 2DPC 1R up to 4000 and 2DPC 2R up to 3600 MHz. JEDEC speeds run up to DDR4-3200. · Manufacturer specification · CPU, BIOS and validated DIMM population determine supported capacity and speeds. DDR4 and DDR5 are not interchangeable.

MSI B550-A PRO — manufacturer specifications

Check the exact configuration and source conditions for your use.

Storage interfaces and restrictions

In Visual facts
ASUS ROG STRIX B550-A GAMINGTotal supports 2 x M.2 slot(s) and 6 x SATA 6Gb/s ports AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors: 1 x M.2_1 socket 3, with M key, type 2242/2260/2280/22110 storage devices support(SATA & PCIe 4.0 x4 mode) AMD RyzenTM 4000 G-Series Processor: 1 x M.2_1 socket 3, with M key, type 2242/2260/2280/22110 storage devices support (SATA & PCIE 3.0 x 4 mode)* AMD B550 Chipset: 1 x M.2_2 socket 3, with M key, type 2242/2260/2280/22110 storage devices support (SATA & PCIE 3.0 x 4 mode) 6 x SATA 6Gb/s port(s), Support Raid 0, 1, 10
MSI B550-A PRO1 × M.2 PCIe 4.0 x4; 1 × M.2 PCIe 3.0 x4; M2_1 also supports SATA; 6 × SATA 6 Gb/s
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

M2_1 connects to the CPU; M2_2 connects to the B550 chipset. · Manufacturer specification · M2_1 runs at PCIe 4.0 or 3.0 depending on the installed processor. A PCIe SSD in M2_2 disables PCI_E3.

MSI B550-A PRO — manufacturer specifications

Check the exact configuration and source conditions for your use.

Network interfaces and requirements

In Visual facts
ASUS ROG STRIX B550-A GAMINGIntel® I225-V 2.5Gb Ethernet ASUS LANGuard
MSI B550-A PRORealtek 8111H 1 Gb Ethernet
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

Manufacturer specification · Wired Ethernet only; MSI lists no Wi-Fi or Bluetooth hardware for this board.

MSI B550-A PRO — manufacturer specifications

Check the exact configuration and source conditions for your use.

Audio interfaces

In Visual facts
ASUS ROG STRIX B550-A GAMINGROG SupremeFX 8-Channel High Definition Audio CODEC S1220A - Dual OP Amplifiers - Impedance sense for front and rear headphone outputs - Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking - High quality 120 dB SNR stereo playback output and 113 dB SNR recording input - Supports up to 32-Bit/192kHz playback * Audio Feature: - SupremeFX Shielding™ Technology - Gold-plated jacks - Optical S/PDIF in port(s) at back panel - Audio Shielding - Premium Japanese audio capacitors - Audio Cover * Due to limitations in HDA bandwidth, 32-Bit/192kHz is not supported for 8-Channel audio.
MSI B550-A PRORealtek ALC892 or ALC897 codec; 7.1-channel
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

Manufacturer specification · Manufacturer-listed onboard audio hardware, not a measured sound-quality result. Where alternatives are listed, no particular unseen controller revision is promised.

MSI B550-A PRO — manufacturer specifications

Check the exact configuration and source conditions for your use.

Configuration & compatibility details (2)

Form factor and dimensions

ASUS ROG STRIX B550-A GAMINGATX Form Factor 12 inch x 9.6 inch ( 30.5 cm x 24.4 cm )
MSI B550-A PROATX; 305 × 244 mm
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

Manufacturer specification · Board dimensions, not retail packaging. Check case mounting positions, clearance and cable routing.

MSI B550-A PRO — manufacturer specifications

These descriptions or measurements differ. Wording alone does not establish a different capability; check the exact configuration.

CPU support and BIOS requirements

ASUS ROG STRIX B550-A GAMINGAMD AM4 Socket for AMD Ryzen™ 5000 Series/ 4000 G-Series/ 3000 Series Desktop Processors * Refer to www.asus.com for CPU support list BIOS: 256 Mb Flash ROM, UEFI AMI BIOS
MSI B550-A PROAMD Ryzen 5000 / 3000 Series (except Ryzen 5 3400G and Ryzen 3 3200G) and 4000 G-Series
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification · Exact CPU support and BIOS revision depend on the processor and the current ASUS CPU support list; the family statement is not a guarantee for every processor.

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

Manufacturer specification · Check MSI's exact CPU support list and its required BIOS. Family support does not confirm the firmware installed on a retail board.

MSI B550-A PRO — manufacturer specifications

These descriptions or measurements differ. Wording alone does not establish a different capability; check the exact configuration.

Missing or non-comparable evidence (21)

DIMM slots

ASUS ROG STRIX B550-A GAMINGNot verified
MSI B550-A PRO4
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded for this side.

MSI B550-A PRO

Manufacturer specification · Physical DDR4 module positions, not included modules. Consult the board manual for population order and compatible capacities.

MSI B550-A PRO — manufacturer specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Maximum listed memory

ASUS ROG STRIX B550-A GAMINGNot verified
MSI B550-A PRO128 GB
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded for this side.

MSI B550-A PRO

Manufacturer specification · Manufacturer capacity ceiling for this exact board, not included memory or a performance measurement. CPU, BIOS, DIMM population and the validated-module list determine support. DDR4 slots require DDR4 modules; DDR4 and DDR5 are not interchangeable.

MSI B550-A PRO — manufacturer specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Onboard M.2 storage slots

ASUS ROG STRIX B550-A GAMINGNot verified
MSI B550-A PRO2
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded for this side.

MSI B550-A PRO

Manufacturer specification · Onboard M.2 storage positions only. M.2 generation depends on the CPU. Installing a PCIe SSD in M2_2 disables PCI_E3.

MSI B550-A PRO — manufacturer specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Secondary expansion slots

ASUS ROG STRIX B550-A GAMINGNot verified
MSI B550-A PRO1 long PCIe 3.0 slot wired x4; 2 PCIe 3.0 x1 slots
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded for this side.

MSI B550-A PRO

The x4-wired long slot is PCI_E3. · Manufacturer specification · Installing a PCIe SSD in M2_2 makes PCI_E3 unavailable.

MSI B550-A PRO — manufacturer specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Rear Flash BIOS button

ASUS ROG STRIX B550-A GAMINGNot verified
MSI B550-A PROYes
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded for this side.

MSI B550-A PRO

Manufacturer specification · Button presence only. Recovery procedure and USB preparation require the exact manual.

MSI B550-A PRO — manufacturer specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

ECC module operating mode

ASUS ROG STRIX B550-A GAMINGNot verified
MSI B550-A PROECC UDIMM supported in non-ECC mode
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded for this side.

MSI B550-A PRO

Manufacturer specification · ECC modules run in non-ECC mode, so error correction is not active.

MSI B550-A PRO — manufacturer specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Expansion/storage lane sharing

ASUS ROG STRIX B550-A GAMINGNot verified
MSI B550-A PROInstalling a PCIe SSD in M2_2 makes PCI_E3 unavailable.
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded for this side.

MSI B550-A PRO

Manufacturer specification · Plan storage drives and expansion cards together; this restriction applies to this board's slot wiring.

MSI B550-A PRO — manufacturer specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Expansion slots and restrictions

ASUS ROG STRIX B550-A GAMINGAMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors 1 x PCIe 4.0 x16 (x16 mode) AMD RyzenTM 4000 G-Series Processor 1 x PCIe 3.0 x16 (x16 mode) AMD B550 Chipset 1 x PCIe 3.0 x16 (x4 mode) * 3 x PCIe 3.0 x1
MSI B550-A PRONot verified
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Cooling headers

ASUS ROG STRIX B550-A GAMINGNot verified
MSI B550-A PRO1 CPU; 1 pump; 6 system fan headers
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded for this side.

MSI B550-A PRO

Manufacturer specification · Board headers, not supplied fans or an assertion of current limits.

MSI B550-A PRO — manufacturer specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Processor-dependent display outputs

ASUS ROG STRIX B550-A GAMINGNot verified
MSI B550-A PROHDMI 2.1 and DisplayPort: up to 4096×2160 at 60 Hz
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded for this side.

MSI B550-A PRO

Manufacturer specification · Requires integrated CPU graphics; supported modes depend on processor.

MSI B550-A PRO — manufacturer specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Internal headers and connectors

ASUS ROG STRIX B550-A GAMING1 x CPU Fan connector(s) 1 x CPU OPT Fan connector(s) 3 x Chassis Fan connector(s) 1 x AIO_PUMP connector 1 x AAFP connector 2 x Aura RGB Strip Header(s) 1 x Addressable Gen 2 header(s) 1 x USB 3.2 Gen 1(up to 5Gbps) connector(s) support(s) additional 2 USB 3.2 Gen 1 port(s) 2 x USB 2.0 connector(s) support(s) additional 4 USB 2.0 port(s) 1 x M.2 Socket 1 with M key, type 2242/2260/2280/22110 storage devices support(SATA & PCIe 4.0 x4 mode) 1 x M.2 Socket 2 with M key, type 2242/2260/2280/22110 storage devices support (SATA & PCIE 3.0 x 4 mode) 6 x SATA 6Gb/s connector(s) 1 x Thunderbolt header(s) 1 x 24-pin EATX Power connector(s) 1 x 8-pin ATX 12V Power connector(s) 1 x 4-pin ATX 12V Power connector(s) 1 x System panel(s) 1 x Thermal sensor connector(s) 1 x Clear CMOS jumper(s)
MSI B550-A PRONot verified
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Published memory OC configurations

ASUS ROG STRIX B550-A GAMINGNot verified
MSI B550-A PRO1DPC 1R up to 4800; 1DPC 2R up to 3866; 2DPC 1R up to 4000; 2DPC 2R up to 3600
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded for this side.

MSI B550-A PRO

MSI labels these memory speeds in MHz (manufacturer notation); they are the rated data rates. · Manufacturer specification · Manufacturer OC configurations, not guaranteed kit speed or measured application performance. CPU, BIOS, memory rank and DIMMs per channel determine support.

MSI B550-A PRO — manufacturer specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

NVMe RAID modes

ASUS ROG STRIX B550-A GAMINGNot verified
MSI B550-A PRORAID 0/1
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded for this side.

MSI B550-A PRO

Manufacturer specification · Requires compatible drives and array configuration; no data protection guarantee.

MSI B550-A PRO — manufacturer specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Listed operating systems

ASUS ROG STRIX B550-A GAMINGWindows® 10 64-bit
MSI B550-A PRONot verified
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Primary expansion-slot link

ASUS ROG STRIX B550-A GAMINGNot verified
MSI B550-A PROPCI_E1: PCIe 4.0 x16
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded for this side.

MSI B550-A PRO

Manufacturer specification · PCIe 4.0 or 3.0 depending on the installed processor; not a measured graphics performance result.

MSI B550-A PRO — manufacturer specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Rear-panel ports

ASUS ROG STRIX B550-A GAMING1 x Intel® I225-V 2.5Gb Ethernet 1 x DisplayPort 1 x HDMI 2 x USB 3.2 Gen 2 (1 x Type-A+1 x USB Type-C®) 4 x USB 3.2 Gen 1 2 x USB 2.0 1 x Optical S/PDIF out 1 x BIOS FlashBack™ Button(s) 5 x Gold-plated audio jacks
MSI B550-A PRONot verified
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

SATA storage ports

ASUS ROG STRIX B550-A GAMINGNot verified
MSI B550-A PRO6
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded for this side.

MSI B550-A PRO

Manufacturer specification · SATA 6 Gb/s connectors, not supplied drives or power cables. M.2 generation depends on the CPU. Installing a PCIe SSD in M2_2 disables PCI_E3.

MSI B550-A PRO — manufacturer specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

SATA RAID modes

ASUS ROG STRIX B550-A GAMINGNot verified
MSI B550-A PRORAID 0/1/10
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded for this side.

MSI B550-A PRO

Manufacturer specification · Requires compatible drives and array configuration; no data protection guarantee.

MSI B550-A PRO — manufacturer specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

USB ports and headers

ASUS ROG STRIX B550-A GAMINGRear USB Port ( Total 8 ) 2 x USB 3.2 Gen 2 port(s)(1 x Type-A +1 x USB Type-C®) 4 x USB 3.2 Gen 1 port(s)(4 x Type-A) 2 x USB 2.0 port(s) Front USB Port ( Total 6 ) 2 x USB 3.2 Gen 1 port(s) 4 x USB 2.0 port(s)
MSI B550-A PRONot verified
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Front USB header capacity

ASUS ROG STRIX B550-A GAMINGNot verified
MSI B550-A PRO4 USB 2.0; 2 USB 5 Gb/s Type-A; 1 USB 5 Gb/s Type-C
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded for this side.

MSI B550-A PRO

Manufacturer specification · Requires compatible case ports and cabling; not rear sockets.

MSI B550-A PRO — manufacturer specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Rear USB ports

ASUS ROG STRIX B550-A GAMINGNot verified
MSI B550-A PRO4 USB 2.0; 2 USB 5 Gb/s Type-A; 1 USB 10 Gb/s Type-A; 1 USB 10 Gb/s Type-C
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded for this side.

MSI B550-A PRO

Manufacturer specification · Port inventory and interface ratings, not simultaneous measured throughput or charging power.

MSI B550-A PRO — manufacturer specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

2 shared fields have the same recorded value.

WHAT EACH CHOICE ASKS OF YOU

What it brings and what to check

ASUS ROG STRIX B550-A GAMING

What it brings

  • Published motherboard interfaces and configuration are available from the exact-model ASUS specification source.

What to check

  • Compatibility and maximum operating modes depend on the source’s stated hardware, firmware and connection requirements; manufacturer figures are not independent measurements.
COMPARE THE DETAILS

Full specifications

How we verify
29 of 29 specifications Sources in each row
Source-backed specifications for ASUS ROG STRIX B550-A GAMING and MSI B550-A PRO
SpecificationASUS ROG STRIX B550-A GAMINGMSI B550-A PRO
CPU socket
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

Manufacturer specification · Match the exact CPU and required BIOS as well as the physical socket.

MSI B550-A PRO — manufacturer specifications
AM4AM4
Chipset
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

Manufacturer specification

MSI B550-A PRO — manufacturer specifications
AMD B550AMD B550
Form factor and dimensionsDifferent
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

Manufacturer specification · Board dimensions, not retail packaging. Check case mounting positions, clearance and cable routing.

MSI B550-A PRO — manufacturer specifications
ATX Form Factor 12 inch x 9.6 inch ( 30.5 cm x 24.4 cm )ATX; 305 × 244 mm
CPU support and BIOS requirementsDifferent
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification · Exact CPU support and BIOS revision depend on the processor and the current ASUS CPU support list; the family statement is not a guarantee for every processor.

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

Manufacturer specification · Check MSI's exact CPU support list and its required BIOS. Family support does not confirm the firmware installed on a retail board.

MSI B550-A PRO — manufacturer specifications
AMD AM4 Socket for AMD Ryzen™ 5000 Series/ 4000 G-Series/ 3000 Series Desktop Processors * Refer to www.asus.com for CPU support list BIOS: 256 Mb Flash ROM, UEFI AMI BIOSAMD Ryzen 5000 / 3000 Series (except Ryzen 5 3400G and Ryzen 3 3200G) and 4000 G-Series
Listed operating systems
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

No source recorded.

Windows® 10 64-bitNot provided
Rear Flash BIOS button
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded.

MSI B550-A PRO

Manufacturer specification · Button presence only. Recovery procedure and USB preparation require the exact manual.

MSI B550-A PRO — manufacturer specifications
Not providedYes
Memory type, slots and limitDifferent
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

The overclocked speed is MSI's 1DPC 1R maximum (MSI's A-XMP speed list itself runs to 4400+ MHz); MSI lists 1DPC 2R up to 3866, 2DPC 1R up to 4000 and 2DPC 2R up to 3600 MHz. JEDEC speeds run up to DDR4-3200. · Manufacturer specification · CPU, BIOS and validated DIMM population determine supported capacity and speeds. DDR4 and DDR5 are not interchangeable.

MSI B550-A PRO — manufacturer specifications
AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors 4 x DIMM, Max. 128GB, DDR4 4600(O.C)/4400(O.C)/4133(O.C.)/4000(O.C.)/3866(O.C.)/3600(O.C.)/3466(O.C.)/3200/3000/2800/2666/2400/2133 MHz Un-buffered Memory AMD RyzenTM 4000 G-Series Processors 4 x DIMM, Max. 128GB, DDR4 5100(O.C)/4800(O.C.)/4600(O.C)/4400(O.C)/4133(O.C.)/4000(O.C.)/3866(O.C.)/3600(O.C.)/3466(O.C.)/3200/3000/2800/2666/2400/2133 MHz Un-buffered Memory Dual Channel Memory Architecture OptiMem II ECC Memory (ECC mode) support varies by CPU. * Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists).4 DDR4 DIMM slots; dual channel; up to 128 GB; up to DDR4-4800 (OC); A-XMP; non-ECC unbuffered
Maximum listed memory
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded.

MSI B550-A PRO

Manufacturer specification · Manufacturer capacity ceiling for this exact board, not included memory or a performance measurement. CPU, BIOS, DIMM population and the validated-module list determine support. DDR4 slots require DDR4 modules; DDR4 and DDR5 are not interchangeable.

MSI B550-A PRO — manufacturer specifications
Not provided128 GB
DIMM slots
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded.

MSI B550-A PRO

Manufacturer specification · Physical DDR4 module positions, not included modules. Consult the board manual for population order and compatible capacities.

MSI B550-A PRO — manufacturer specifications
Not provided4
Published memory OC configurations
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded.

MSI B550-A PRO

MSI labels these memory speeds in MHz (manufacturer notation); they are the rated data rates. · Manufacturer specification · Manufacturer OC configurations, not guaranteed kit speed or measured application performance. CPU, BIOS, memory rank and DIMMs per channel determine support.

MSI B550-A PRO — manufacturer specifications
Not provided1DPC 1R up to 4800; 1DPC 2R up to 3866; 2DPC 1R up to 4000; 2DPC 2R up to 3600
ECC module operating mode
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded.

MSI B550-A PRO

Manufacturer specification · ECC modules run in non-ECC mode, so error correction is not active.

MSI B550-A PRO — manufacturer specifications
Not providedECC UDIMM supported in non-ECC mode
Storage interfaces and restrictionsDifferent
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

M2_1 connects to the CPU; M2_2 connects to the B550 chipset. · Manufacturer specification · M2_1 runs at PCIe 4.0 or 3.0 depending on the installed processor. A PCIe SSD in M2_2 disables PCI_E3.

MSI B550-A PRO — manufacturer specifications
Total supports 2 x M.2 slot(s) and 6 x SATA 6Gb/s ports AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors: 1 x M.2_1 socket 3, with M key, type 2242/2260/2280/22110 storage devices support(SATA & PCIe 4.0 x4 mode) AMD RyzenTM 4000 G-Series Processor: 1 x M.2_1 socket 3, with M key, type 2242/2260/2280/22110 storage devices support (SATA & PCIE 3.0 x 4 mode)* AMD B550 Chipset: 1 x M.2_2 socket 3, with M key, type 2242/2260/2280/22110 storage devices support (SATA & PCIE 3.0 x 4 mode) 6 x SATA 6Gb/s port(s), Support Raid 0, 1, 101 × M.2 PCIe 4.0 x4; 1 × M.2 PCIe 3.0 x4; M2_1 also supports SATA; 6 × SATA 6 Gb/s
Onboard M.2 storage slots
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded.

MSI B550-A PRO

Manufacturer specification · Onboard M.2 storage positions only. M.2 generation depends on the CPU. Installing a PCIe SSD in M2_2 disables PCI_E3.

MSI B550-A PRO — manufacturer specifications
Not provided2
SATA storage ports
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded.

MSI B550-A PRO

Manufacturer specification · SATA 6 Gb/s connectors, not supplied drives or power cables. M.2 generation depends on the CPU. Installing a PCIe SSD in M2_2 disables PCI_E3.

MSI B550-A PRO — manufacturer specifications
Not provided6
SATA RAID modes
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded.

MSI B550-A PRO

Manufacturer specification · Requires compatible drives and array configuration; no data protection guarantee.

MSI B550-A PRO — manufacturer specifications
Not providedRAID 0/1/10
NVMe RAID modes
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded.

MSI B550-A PRO

Manufacturer specification · Requires compatible drives and array configuration; no data protection guarantee.

MSI B550-A PRO — manufacturer specifications
Not providedRAID 0/1
Expansion slots and restrictions
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

No source recorded.

AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors 1 x PCIe 4.0 x16 (x16 mode) AMD RyzenTM 4000 G-Series Processor 1 x PCIe 3.0 x16 (x16 mode) AMD B550 Chipset 1 x PCIe 3.0 x16 (x4 mode) * 3 x PCIe 3.0 x1Not provided
Primary expansion-slot link
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded.

MSI B550-A PRO

Manufacturer specification · PCIe 4.0 or 3.0 depending on the installed processor; not a measured graphics performance result.

MSI B550-A PRO — manufacturer specifications
Not providedPCI_E1: PCIe 4.0 x16
Secondary expansion slots
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded.

MSI B550-A PRO

The x4-wired long slot is PCI_E3. · Manufacturer specification · Installing a PCIe SSD in M2_2 makes PCI_E3 unavailable.

MSI B550-A PRO — manufacturer specifications
Not provided1 long PCIe 3.0 slot wired x4; 2 PCIe 3.0 x1 slots
Expansion/storage lane sharing
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded.

MSI B550-A PRO

Manufacturer specification · Plan storage drives and expansion cards together; this restriction applies to this board's slot wiring.

MSI B550-A PRO — manufacturer specifications
Not providedInstalling a PCIe SSD in M2_2 makes PCI_E3 unavailable.
USB ports and headers
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

No source recorded.

Rear USB Port ( Total 8 ) 2 x USB 3.2 Gen 2 port(s)(1 x Type-A +1 x USB Type-C®) 4 x USB 3.2 Gen 1 port(s)(4 x Type-A) 2 x USB 2.0 port(s) Front USB Port ( Total 6 ) 2 x USB 3.2 Gen 1 port(s) 4 x USB 2.0 port(s)Not provided
Rear-panel ports
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

No source recorded.

1 x Intel® I225-V 2.5Gb Ethernet 1 x DisplayPort 1 x HDMI 2 x USB 3.2 Gen 2 (1 x Type-A+1 x USB Type-C®) 4 x USB 3.2 Gen 1 2 x USB 2.0 1 x Optical S/PDIF out 1 x BIOS FlashBack™ Button(s) 5 x Gold-plated audio jacksNot provided
Audio interfacesDifferent
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

Manufacturer specification · Manufacturer-listed onboard audio hardware, not a measured sound-quality result. Where alternatives are listed, no particular unseen controller revision is promised.

MSI B550-A PRO — manufacturer specifications
ROG SupremeFX 8-Channel High Definition Audio CODEC S1220A - Dual OP Amplifiers - Impedance sense for front and rear headphone outputs - Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking - High quality 120 dB SNR stereo playback output and 113 dB SNR recording input - Supports up to 32-Bit/192kHz playback * Audio Feature: - SupremeFX Shielding™ Technology - Gold-plated jacks - Optical S/PDIF in port(s) at back panel - Audio Shielding - Premium Japanese audio capacitors - Audio Cover * Due to limitations in HDA bandwidth, 32-Bit/192kHz is not supported for 8-Channel audio.Realtek ALC892 or ALC897 codec; 7.1-channel
Processor-dependent display outputs
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded.

MSI B550-A PRO

Manufacturer specification · Requires integrated CPU graphics; supported modes depend on processor.

MSI B550-A PRO — manufacturer specifications
Not providedHDMI 2.1 and DisplayPort: up to 4096×2160 at 60 Hz
Rear USB ports
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded.

MSI B550-A PRO

Manufacturer specification · Port inventory and interface ratings, not simultaneous measured throughput or charging power.

MSI B550-A PRO — manufacturer specifications
Not provided4 USB 2.0; 2 USB 5 Gb/s Type-A; 1 USB 10 Gb/s Type-A; 1 USB 10 Gb/s Type-C
Front USB header capacity
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded.

MSI B550-A PRO

Manufacturer specification · Requires compatible case ports and cabling; not rear sockets.

MSI B550-A PRO — manufacturer specifications
Not provided4 USB 2.0; 2 USB 5 Gb/s Type-A; 1 USB 5 Gb/s Type-C
Network interfaces and requirementsDifferent
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

Manufacturer specification · Wired Ethernet only; MSI lists no Wi-Fi or Bluetooth hardware for this board.

MSI B550-A PRO — manufacturer specifications
Intel® I225-V 2.5Gb Ethernet ASUS LANGuardRealtek 8111H 1 Gb Ethernet
Cooling headers
Sources
ASUS ROG STRIX B550-A GAMING

No source recorded.

MSI B550-A PRO

Manufacturer specification · Board headers, not supplied fans or an assertion of current limits.

MSI B550-A PRO — manufacturer specifications
Not provided1 CPU; 1 pump; 6 system fan headers
Internal headers and connectors
Sources
ASUS ROG STRIX B550-A GAMING

Manufacturer specification

ASUS ROG STRIX B550-A GAMING — official UK technical specifications
MSI B550-A PRO

No source recorded.

1 x CPU Fan connector(s) 1 x CPU OPT Fan connector(s) 3 x Chassis Fan connector(s) 1 x AIO_PUMP connector 1 x AAFP connector 2 x Aura RGB Strip Header(s) 1 x Addressable Gen 2 header(s) 1 x USB 3.2 Gen 1(up to 5Gbps) connector(s) support(s) additional 2 USB 3.2 Gen 1 port(s) 2 x USB 2.0 connector(s) support(s) additional 4 USB 2.0 port(s) 1 x M.2 Socket 1 with M key, type 2242/2260/2280/22110 storage devices support(SATA & PCIe 4.0 x4 mode) 1 x M.2 Socket 2 with M key, type 2242/2260/2280/22110 storage devices support (SATA & PCIE 3.0 x 4 mode) 6 x SATA 6Gb/s connector(s) 1 x Thunderbolt header(s) 1 x 24-pin EATX Power connector(s) 1 x 8-pin ATX 12V Power connector(s) 1 x 4-pin ATX 12V Power connector(s) 1 x System panel(s) 1 x Thermal sensor connector(s) 1 x Clear CMOS jumper(s)Not provided
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Maximum memory
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DIMM slots
4 slots
M.2 slots
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Prices & product profile
ASUS PRIME B550-PLUS official product image

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CPU socket
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Chipset
AMD B550
Form factor and dimensions
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Prices & product profile

Each record represents an explicitly checked model and configuration. Original import: 5 Sept 2026; this is not its verification date. This is not a list of current offers or a popularity ranking.