UK manufacturer specification · PRIME B550M-A
PRIME B550M-A 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 specifications4 verified differences, led by Form factor and dimensions, memory type, slots and limit and storage interfaces and restrictions. Compared in full below. Not a rating.
AM4 · ATX · DDR4 · board-only configuration · MSI global specification
An ATX AM4 motherboard with AMD B550: four DDR4 slots rated up to DDR4-4400+ (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 21 Sept 2026.
Amazon links open search results. Check the exact variant, current price and availability with the retailer.
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Differences first. Select a topic for its graphic, sources and conditions.
Check the exact configuration and source conditions for your use.
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.
4 verified differences, most decision-relevant first. All are also drawn in Visual facts above. Missing information stays separate.
Manufacturer specification
ASUS PRIME B550M-A — official UK technical specificationsManufacturer specification · Board dimensions, not retail packaging. Check case mounting positions, clearance and cable routing.
MSI MPG B550 GAMING PLUS — manufacturer specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification
ASUS PRIME B550M-A — official UK technical specificationsThe overclocked speed is MSI's 1DPC 1R maximum; 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 MPG B550 GAMING PLUS — manufacturer specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification
ASUS PRIME B550M-A — official UK technical specificationsM2_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 MPG B550 GAMING PLUS — manufacturer specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification
ASUS PRIME B550M-A — official UK technical specificationsManufacturer specification · Wired Ethernet only; MSI lists no Wi-Fi or Bluetooth hardware for this board.
MSI MPG B550 GAMING PLUS — manufacturer specificationsCheck the exact configuration and source conditions for your use.
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 PRIME B550M-A — official UK technical specificationsManufacturer 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 MPG B550 GAMING PLUS — manufacturer specificationsThese descriptions or measurements differ. Wording alone does not establish a different capability; check the exact configuration.
No source recorded for this side.
Manufacturer specification · Physical DDR4 module positions, not included modules. Consult the board manual for population order and compatible capacities.
MSI MPG B550 GAMING PLUS — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
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 MPG B550 GAMING PLUS — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Onboard M.2 storage positions only. M.2 generation depends on the CPU. A PCIe SSD installed in M2_2 disables PCI_E3.
MSI MPG B550 GAMING PLUS — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · A PCIe SSD in M2_2 disables PCI_E3.
MSI MPG B550 GAMING PLUS — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification
ASUS PRIME B550M-A — official UK technical specificationsMSI lists ALC892 or ALC897: its specification gives the codec as 'ALC892/ALC897', meaning a board may ship with either, and does not say which. Both describe Realtek 7.1-channel High Definition Audio with S/PDIF output support. · Manufacturer specification
MSI MPG B550 GAMING PLUS — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Button presence only. Recovery procedure and USB preparation require the exact manual.
MSI MPG B550 GAMING PLUS — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Status LEDs, not a numeric POST display or an automatic repair guarantee.
MSI MPG B550 GAMING PLUS — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · ECC modules run in non-ECC mode, so error correction is not active.
MSI MPG B550 GAMING PLUS — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Plan storage drives and expansion cards together; this restriction applies to this board's slot wiring.
MSI MPG B550 GAMING PLUS — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification
ASUS PRIME B550M-A — official UK technical specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Board headers, not supplied fans or an assertion of current limits.
MSI MPG B550 GAMING PLUS — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Requires integrated CPU graphics; supported modes depend on processor.
MSI MPG B550 GAMING PLUS — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
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 MPG B550 GAMING PLUS — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Requires compatible drives and array configuration; no data protection guarantee.
MSI MPG B550 GAMING PLUS — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification
ASUS PRIME B550M-A — official UK technical specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · PCIe 4.0 or 3.0 depending on the installed processor; not a measured graphics performance result.
MSI MPG B550 GAMING PLUS — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · SATA 6 Gb/s connectors, not supplied drives or power cables. M.2 generation depends on the CPU. A PCIe SSD installed in M2_2 disables PCI_E3.
MSI MPG B550 GAMING PLUS — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Requires compatible drives and array configuration; no data protection guarantee.
MSI MPG B550 GAMING PLUS — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Requires compatible case ports and cabling; not rear sockets.
MSI MPG B550 GAMING PLUS — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Port inventory and interface ratings, not simultaneous measured throughput or charging power.
MSI MPG B550 GAMING PLUS — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
2 shared fields have the same recorded value.
| Specification | ASUS PRIME B550M-A | MSI MPG B550 GAMING PLUS |
|---|---|---|
CPU socket SourcesASUS PRIME B550M-A Manufacturer specification ASUS PRIME B550M-A — official UK technical specificationsMSI MPG B550 GAMING PLUS Manufacturer specification · Match the exact CPU and required BIOS as well as the physical socket. MSI MPG B550 GAMING PLUS — manufacturer specifications | AM4 | AM4 |
Chipset SourcesASUS PRIME B550M-A Manufacturer specification ASUS PRIME B550M-A — official UK technical specificationsMSI MPG B550 GAMING PLUS Manufacturer specification MSI MPG B550 GAMING PLUS — manufacturer specifications | AMD B550 | AMD B550 |
Form factor and dimensionsDifferent SourcesASUS PRIME B550M-A Manufacturer specification ASUS PRIME B550M-A — official UK technical specificationsMSI MPG B550 GAMING PLUS Manufacturer specification · Board dimensions, not retail packaging. Check case mounting positions, clearance and cable routing. MSI MPG B550 GAMING PLUS — manufacturer specifications | mATX Form Factor 9.6 inch x 9.6 inch ( 24.4 cm x 24.4 cm ) | ATX; 305 × 244 mm |
CPU support and BIOS requirementsDifferent SourcesASUS PRIME B550M-A 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 PRIME B550M-A — official UK technical specificationsMSI MPG B550 GAMING PLUS 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 MPG B550 GAMING PLUS — 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 BIOS | AMD Ryzen 5000 / 3000 Series (except Ryzen 5 3400G and Ryzen 3 3200G) and 4000 G-Series |
Listed operating systems SourcesASUS PRIME B550M-A Manufacturer specification ASUS PRIME B550M-A — official UK technical specificationsMSI MPG B550 GAMING PLUS No source recorded. | Windows® 10 64-bit | Not provided |
Rear Flash BIOS button SourcesASUS PRIME B550M-A No source recorded. MSI MPG B550 GAMING PLUS Manufacturer specification · Button presence only. Recovery procedure and USB preparation require the exact manual. MSI MPG B550 GAMING PLUS — manufacturer specifications | Not provided | Yes |
Memory type, slots and limitDifferent SourcesASUS PRIME B550M-A Manufacturer specification ASUS PRIME B550M-A — official UK technical specificationsMSI MPG B550 GAMING PLUS The overclocked speed is MSI's 1DPC 1R maximum; 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 MPG B550 GAMING PLUS — manufacturer specifications | AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors 4 x DIMM, Max. 128GB, DDR4 4600(O.C)/4400(O.C)/4266(O.C.)/4133(O.C.)/4000(O.C.)/3866(O.C.)/3733(O.C.)/3600(O.C.)/3466(O.C.)/3333(O.C.)/3200/3000/2800/2666/2400/2133 MHz Un-buffered Memory * AMD Ryzen™ 4000 G-Series Desktop Processors 4 x DIMM, Max. 128GB, DDR4 4800(O.C.)/4600(O.C)/4466(O.C.)/4400(O.C)/4266(O.C.)/4133(O.C.)/4000(O.C.)/3866(O.C.)/3733(O.C.)/3600(O.C.)/3466(O.C.)/3333(O.C.)/3200/3000/2800/2666/2400/2133 MHz Un-buffered Memory * Dual Channel Memory Architecture 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 DDR4-4400+ (OC); A-XMP; non-ECC unbuffered |
Maximum listed memory SourcesASUS PRIME B550M-A No source recorded. MSI MPG B550 GAMING PLUS 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 MPG B550 GAMING PLUS — manufacturer specifications | Not provided | 128 GB |
DIMM slots SourcesASUS PRIME B550M-A No source recorded. MSI MPG B550 GAMING PLUS Manufacturer specification · Physical DDR4 module positions, not included modules. Consult the board manual for population order and compatible capacities. MSI MPG B550 GAMING PLUS — manufacturer specifications | Not provided | 4 |
Published memory OC configurations SourcesASUS PRIME B550M-A No source recorded. MSI MPG B550 GAMING PLUS 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 MPG B550 GAMING PLUS — manufacturer specifications | Not provided | 1DPC 1R up to 4400; 1DPC 2R up to 3866; 2DPC 1R up to 4000; 2DPC 2R up to 3600 |
ECC module operating mode SourcesASUS PRIME B550M-A No source recorded. MSI MPG B550 GAMING PLUS Manufacturer specification · ECC modules run in non-ECC mode, so error correction is not active. MSI MPG B550 GAMING PLUS — manufacturer specifications | Not provided | ECC UDIMM supported in non-ECC mode |
Storage interfaces and restrictionsDifferent SourcesASUS PRIME B550M-A Manufacturer specification ASUS PRIME B550M-A — official UK technical specificationsMSI MPG B550 GAMING PLUS 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 MPG B550 GAMING PLUS — manufacturer specifications | Total supports 2 x M.2 slot(s) and 4 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(PCIE 4.0 x4 and SATA modes) storage devices support AMD Ryzen™ 4000 G-Series Desktop Processors: 1 x M.2_1 socket 3, with M Key, Type 2242/2260/2280/22110(PCIE 3.0 x4 and SATA modes) storage devices support AMD B550 Chipset: 1 x M.2_2 socket 3, with M Key, Type 2242/2260/2280 (PCIE 3.0 x4 and SATA modes) storage devices support 4 x SATA 6Gb/s port(s), Support Raid 0, 1, 10 | 1 × 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 SourcesASUS PRIME B550M-A No source recorded. MSI MPG B550 GAMING PLUS Manufacturer specification · Onboard M.2 storage positions only. M.2 generation depends on the CPU. A PCIe SSD installed in M2_2 disables PCI_E3. MSI MPG B550 GAMING PLUS — manufacturer specifications | Not provided | 2 |
SATA storage ports SourcesASUS PRIME B550M-A No source recorded. MSI MPG B550 GAMING PLUS Manufacturer specification · SATA 6 Gb/s connectors, not supplied drives or power cables. M.2 generation depends on the CPU. A PCIe SSD installed in M2_2 disables PCI_E3. MSI MPG B550 GAMING PLUS — manufacturer specifications | Not provided | 6 |
SATA RAID modes SourcesASUS PRIME B550M-A No source recorded. MSI MPG B550 GAMING PLUS Manufacturer specification · Requires compatible drives and array configuration; no data protection guarantee. MSI MPG B550 GAMING PLUS — manufacturer specifications | Not provided | RAID 0/1/10 |
NVMe RAID modes SourcesASUS PRIME B550M-A No source recorded. MSI MPG B550 GAMING PLUS Manufacturer specification · Requires compatible drives and array configuration; no data protection guarantee. MSI MPG B550 GAMING PLUS — manufacturer specifications | Not provided | RAID 0/1 |
Expansion slots and restrictions SourcesASUS PRIME B550M-A Manufacturer specification ASUS PRIME B550M-A — official UK technical specificationsMSI MPG B550 GAMING PLUS No source recorded. | AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors 1 x PCIe 4.0 x16 (x16 mode) AMD Ryzen™ 4000 G-Series Desktop Processors 1 x PCIe 3.0 x16 (x16 mode) AMD B550 Chipset 2 x PCIe 3.0 x1 | Not provided |
Primary expansion-slot link SourcesASUS PRIME B550M-A No source recorded. MSI MPG B550 GAMING PLUS Manufacturer specification · PCIe 4.0 or 3.0 depending on the installed processor; not a measured graphics performance result. MSI MPG B550 GAMING PLUS — manufacturer specifications | Not provided | PCI_E1: PCIe 4.0 x16 |
Secondary expansion slots SourcesASUS PRIME B550M-A No source recorded. MSI MPG B550 GAMING PLUS Manufacturer specification · A PCIe SSD in M2_2 disables PCI_E3. MSI MPG B550 GAMING PLUS — manufacturer specifications | Not provided | 1 long PCIe 3.0 slot wired x4; 2 PCIe 3.0 x1 slots |
Expansion/storage lane sharing SourcesASUS PRIME B550M-A No source recorded. MSI MPG B550 GAMING PLUS Manufacturer specification · Plan storage drives and expansion cards together; this restriction applies to this board's slot wiring. MSI MPG B550 GAMING PLUS — manufacturer specifications | Not provided | A PCIe SSD in M2_2 disables PCI_E3. |
Audio interfaces SourcesASUS PRIME B550M-A Manufacturer specification ASUS PRIME B550M-A — official UK technical specificationsMSI MPG B550 GAMING PLUS MSI lists ALC892 or ALC897: its specification gives the codec as 'ALC892/ALC897', meaning a board may ship with either, and does not say which. Both describe Realtek 7.1-channel High Definition Audio with S/PDIF output support. · Manufacturer specification MSI MPG B550 GAMING PLUS — manufacturer specifications | Realtek ALC887/897 7.1 Surround Sound High Definition Audio CODEC - Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking, up to 24-Bit/192kHz playback Audio Feature: - LED-illuminated design - Audio Shielding - Dedicated audio PCB layers - Premium Japanese audio capacitors * Choose the chassis with HD audio module in front panel to support 8-channel audio output. | Not listed by the manufacturer |
Processor-dependent display outputs SourcesASUS PRIME B550M-A No source recorded. MSI MPG B550 GAMING PLUS Manufacturer specification · Requires integrated CPU graphics; supported modes depend on processor. MSI MPG B550 GAMING PLUS — manufacturer specifications | Not provided | HDMI 2.1 and DisplayPort: up to 4096×2160 at 60 Hz |
Rear USB ports SourcesASUS PRIME B550M-A No source recorded. MSI MPG B550 GAMING PLUS Manufacturer specification · Port inventory and interface ratings, not simultaneous measured throughput or charging power. MSI MPG B550 GAMING PLUS — manufacturer specifications | Not provided | 4 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 SourcesASUS PRIME B550M-A No source recorded. MSI MPG B550 GAMING PLUS Manufacturer specification · Requires compatible case ports and cabling; not rear sockets. MSI MPG B550 GAMING PLUS — manufacturer specifications | Not provided | 4 USB 2.0; 2 USB 5 Gb/s Type-A; 1 USB 5 Gb/s Type-C |
Network interfaces and requirementsDifferent SourcesASUS PRIME B550M-A Manufacturer specification ASUS PRIME B550M-A — official UK technical specificationsMSI MPG B550 GAMING PLUS Manufacturer specification · Wired Ethernet only; MSI lists no Wi-Fi or Bluetooth hardware for this board. MSI MPG B550 GAMING PLUS — manufacturer specifications | Realtek RTL8111H 1Gb Ethernet | Realtek 8111H 1 Gb Ethernet |
Cooling headers SourcesASUS PRIME B550M-A No source recorded. MSI MPG B550 GAMING PLUS Manufacturer specification · Board headers, not supplied fans or an assertion of current limits. MSI MPG B550 GAMING PLUS — manufacturer specifications | Not provided | 1 CPU; 1 pump; 6 system fan headers |
Diagnostic LEDs SourcesASUS PRIME B550M-A No source recorded. MSI MPG B550 GAMING PLUS Manufacturer specification · Status LEDs, not a numeric POST display or an automatic repair guarantee. MSI MPG B550 GAMING PLUS — manufacturer specifications | Not provided | 4 EZ Debug LEDs |
Closest motherboards to this pair by shared key specifications. Not a popularity ranking.
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.
