AM4 · ATX · DDR4 · board-only configuration · MSI global specification
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.
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Manufacturer specificationsChoose the B550-A PRO for
Choose the B550M PRO-VDH WIFI for
AM4 · Micro-ATX · DDR4 · board-only configuration · MSI global specification
A Micro-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) and Wi-Fi AC with Bluetooth 4.2.
Specifications checked 21 Sept 2026.
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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.
Manufacturer specification · Board dimensions, not retail packaging. Check case mounting positions, clearance and cable routing.
Manufacturer specification · Board dimensions, not retail packaging. Check case mounting positions, clearance and cable routing.
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.
9 verified differences, most decision-relevant first. 7 are also drawn in Visual facts above. Missing information stays separate.
Manufacturer specification · Board dimensions, not retail packaging. Check case mounting positions, clearance and cable routing.
MSI B550-A PRO — manufacturer specificationsManufacturer specification · Board dimensions, not retail packaging. Check case mounting positions, clearance and cable routing.
MSI B550M PRO-VDH WIFI — manufacturer specificationsCheck the exact configuration and source conditions for your use.
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 specificationsThe overclocked speed is MSI's 1DPC 1R maximum; MSI lists 1DPC 2R up to 3733, 2DPC 1R up to 3866 and 2DPC 2R up to 3466 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 B550M PRO-VDH WIFI — manufacturer specificationsCheck the exact configuration and source conditions for your use.
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 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. Both M.2 slots accept 2242/2260/2280 drives.
MSI B550M PRO-VDH WIFI — manufacturer specificationsCheck the exact configuration and source conditions for your use.
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 specificationsManufacturer specification · Physical connector length and electrical lane count differ.
MSI B550M PRO-VDH WIFI — manufacturer specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification · Wired Ethernet only; MSI lists no Wi-Fi or Bluetooth hardware for this board.
MSI B550-A PRO — manufacturer specificationsManufacturer specification · MSI lists a maximum Wi-Fi link rate of 433 Mb/s; this is not measured throughput. Only the 2.4 and 5 GHz bands are listed.
MSI B550M PRO-VDH WIFI — manufacturer specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification · Board headers, not supplied fans or an assertion of current limits.
MSI B550-A PRO — manufacturer specificationsManufacturer specification · No included fans or current limits inferred.
MSI B550M PRO-VDH WIFI — manufacturer specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification · Requires integrated CPU graphics; supported modes depend on processor.
MSI B550-A PRO — manufacturer specificationsManufacturer specification · Requires integrated processor graphics; CPU-dependent modes.
MSI B550M PRO-VDH WIFI — manufacturer specificationsCheck the exact configuration and source conditions for your use.
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 specificationsManufacturer specification · SATA 6 Gb/s connectors, not supplied drives or power cables. M.2 PCIe generation depends on the CPU. Both slots accept 2242/2260/2280 drives.
MSI B550M PRO-VDH WIFI — manufacturer specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification · Port inventory and interface ratings, not simultaneous measured throughput or charging power.
MSI B550-A PRO — manufacturer specificationsManufacturer specification · Interface limits, not measured aggregate throughput.
MSI B550M PRO-VDH WIFI — manufacturer specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification · ECC modules run in non-ECC mode, so error correction is not active.
MSI B550-A PRO — manufacturer specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · Plan storage drives and expansion cards together; this restriction applies to this board's slot wiring.
MSI B550-A PRO — manufacturer specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
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 specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
12 shared fields have the same recorded value.
| Specification | MSI B550-A PRO | MSI B550M PRO-VDH WIFI |
|---|---|---|
CPU socket SourcesMSI B550-A PRO Manufacturer specification · Match the exact CPU and required BIOS as well as the physical socket. MSI B550-A PRO — manufacturer specificationsMSI B550M PRO-VDH WIFI Manufacturer specification · Match the exact CPU and required BIOS as well as the physical socket. MSI B550M PRO-VDH WIFI — manufacturer specifications | AM4 | AM4 |
Chipset SourcesMSI B550M PRO-VDH WIFI Manufacturer specification MSI B550M PRO-VDH WIFI — manufacturer specifications | AMD B550 | AMD B550 |
Form factorDifferent SourcesMSI B550-A PRO Manufacturer specification · Board dimensions, not retail packaging. Check case mounting positions, clearance and cable routing. MSI B550-A PRO — manufacturer specificationsMSI B550M PRO-VDH WIFI Manufacturer specification · Board dimensions, not retail packaging. Check case mounting positions, clearance and cable routing. MSI B550M PRO-VDH WIFI — manufacturer specifications | ATX; 305 × 244 mm | Micro-ATX; 244 × 244 mm |
CPU support / BIOS source SourcesMSI 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 specificationsMSI B550M PRO-VDH WIFI 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 B550M PRO-VDH WIFI — manufacturer specifications | AMD Ryzen 5000 / 3000 Series (except Ryzen 5 3400G and Ryzen 3 3200G) and 4000 G-Series | AMD Ryzen 5000 / 3000 Series (except Ryzen 5 3400G and Ryzen 3 3200G) and 4000 G-Series |
Rear Flash BIOS button SourcesMSI B550-A PRO Manufacturer specification · Button presence only. Recovery procedure and USB preparation require the exact manual. MSI B550-A PRO — manufacturer specificationsMSI B550M PRO-VDH WIFI Manufacturer specification · Recovery procedure and USB preparation require the manual. MSI B550M PRO-VDH WIFI — manufacturer specifications | Yes | Yes |
Memory type, slots and limitDifferent SourcesMSI 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 specificationsMSI B550M PRO-VDH WIFI The overclocked speed is MSI's 1DPC 1R maximum; MSI lists 1DPC 2R up to 3733, 2DPC 1R up to 3866 and 2DPC 2R up to 3466 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 B550M PRO-VDH WIFI — manufacturer specifications | 4 DDR4 DIMM slots; dual channel; up to 128 GB; up to DDR4-4800 (OC); A-XMP; non-ECC unbuffered | 4 DDR4 DIMM slots; dual channel; up to 128 GB; up to DDR4-4400+ (OC); A-XMP; non-ECC and ECC unbuffered |
Maximum listed memory SourcesMSI 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 specificationsMSI B550M PRO-VDH WIFI 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 B550M PRO-VDH WIFI — manufacturer specifications | 128 GB | 128 GB |
DIMM slots SourcesMSI 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 specificationsMSI B550M PRO-VDH WIFI Manufacturer specification · Physical DDR4 module positions, not included modules. Consult the board manual for population order and compatible capacities. MSI B550M PRO-VDH WIFI — manufacturer specifications | 4 | 4 |
Published memory OC configurations SourcesMSI 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 specificationsMSI B550M PRO-VDH WIFI No source recorded. | 1DPC 1R up to 4800; 1DPC 2R up to 3866; 2DPC 1R up to 4000; 2DPC 2R up to 3600 | Not provided |
ECC module operating mode SourcesMSI B550-A PRO Manufacturer specification · ECC modules run in non-ECC mode, so error correction is not active. MSI B550-A PRO — manufacturer specificationsMSI B550M PRO-VDH WIFI No source recorded. | ECC UDIMM supported in non-ECC mode | Not provided |
Storage interfacesDifferent SourcesMSI 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 specificationsMSI B550M PRO-VDH WIFI 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. Both M.2 slots accept 2242/2260/2280 drives. MSI B550M PRO-VDH WIFI — manufacturer specifications | 1 × M.2 PCIe 4.0 x4; 1 × M.2 PCIe 3.0 x4; M2_1 also supports SATA; 6 × SATA 6 Gb/s | 1 × M.2 PCIe 4.0 x4; 1 × M.2 PCIe 3.0 x4; M2_1 also supports SATA; 4 × SATA 6 Gb/s |
Onboard M.2 storage slots SourcesMSI 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 specificationsMSI B550M PRO-VDH WIFI Manufacturer specification · Onboard M.2 storage positions only. M.2 PCIe generation depends on the CPU. Both slots accept 2242/2260/2280 drives. MSI B550M PRO-VDH WIFI — manufacturer specifications | 2 | 2 |
SATA storage portsDifferent SourcesMSI 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 specificationsMSI B550M PRO-VDH WIFI Manufacturer specification · SATA 6 Gb/s connectors, not supplied drives or power cables. M.2 PCIe generation depends on the CPU. Both slots accept 2242/2260/2280 drives. MSI B550M PRO-VDH WIFI — manufacturer specifications | 6 | 4 |
SATA RAID modes SourcesMSI B550-A PRO Manufacturer specification · Requires compatible drives and array configuration; no data protection guarantee. MSI B550-A PRO — manufacturer specificationsMSI B550M PRO-VDH WIFI Manufacturer specification · Requires array configuration. No cross-controller array support inferred. MSI B550M PRO-VDH WIFI — manufacturer specifications | RAID 0/1/10 | RAID 0/1/10 |
NVMe RAID modes SourcesMSI B550-A PRO Manufacturer specification · Requires compatible drives and array configuration; no data protection guarantee. MSI B550-A PRO — manufacturer specificationsMSI B550M PRO-VDH WIFI Manufacturer specification · Requires compatible drives and array configuration. MSI B550M PRO-VDH WIFI — manufacturer specifications | RAID 0/1 | RAID 0/1 |
Primary expansion-slot link SourcesMSI 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 specificationsMSI B550M PRO-VDH WIFI Manufacturer specification · PCIe 4.0 or 3.0 depending on the installed processor; not a measured graphics performance result. MSI B550M PRO-VDH WIFI — manufacturer specifications | PCI_E1: PCIe 4.0 x16 | PCI_E1: PCIe 4.0 x16 |
Secondary expansion slotsDifferent SourcesMSI 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 specificationsMSI B550M PRO-VDH WIFI Manufacturer specification · Physical connector length and electrical lane count differ. MSI B550M PRO-VDH WIFI — manufacturer specifications | 1 long PCIe 3.0 slot wired x4; 2 PCIe 3.0 x1 slots | 2 PCIe 3.0 x1 slots |
Expansion/storage lane sharing SourcesMSI 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 specificationsMSI B550M PRO-VDH WIFI No source recorded. | Installing a PCIe SSD in M2_2 makes PCI_E3 unavailable. | Not provided |
Onboard audio hardware SourcesMSI 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 specificationsMSI B550M PRO-VDH WIFI 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 B550M PRO-VDH WIFI — manufacturer specifications | Realtek ALC892 or ALC897 codec; 7.1-channel | Realtek ALC892 or ALC897 codec; 7.1-channel |
Processor-dependent display outputsDifferent SourcesMSI B550-A PRO Manufacturer specification · Requires integrated CPU graphics; supported modes depend on processor. MSI B550-A PRO — manufacturer specificationsMSI B550M PRO-VDH WIFI Manufacturer specification · Requires integrated processor graphics; CPU-dependent modes. MSI B550M PRO-VDH WIFI — manufacturer specifications | HDMI 2.1 and DisplayPort: up to 4096×2160 at 60 Hz | VGA; DisplayPort 4096×2160 at 60 Hz; HDMI 2.1 4096×2160 at 60 Hz |
Rear USB portsDifferent SourcesMSI B550-A PRO Manufacturer specification · Port inventory and interface ratings, not simultaneous measured throughput or charging power. MSI B550-A PRO — manufacturer specificationsMSI B550M PRO-VDH WIFI Manufacturer specification · Interface limits, not measured aggregate throughput. MSI B550M PRO-VDH WIFI — manufacturer specifications | 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 | 2 USB 2.0; 4 USB 5 Gb/s Type-A |
Front USB header capacity SourcesMSI B550-A PRO Manufacturer specification · Requires compatible case ports and cabling; not rear sockets. MSI B550-A PRO — manufacturer specificationsMSI B550M PRO-VDH WIFI Manufacturer specification · Requires case ports and cables; not rear sockets. MSI B550M PRO-VDH WIFI — manufacturer specifications | 4 USB 2.0; 2 USB 5 Gb/s Type-A; 1 USB 5 Gb/s Type-C | 4 USB 2.0; 2 USB 5 Gb/s Type-A; 1 USB 5 Gb/s Type-C |
Network interfacesDifferent SourcesMSI B550-A PRO Manufacturer specification · Wired Ethernet only; MSI lists no Wi-Fi or Bluetooth hardware for this board. MSI B550-A PRO — manufacturer specificationsMSI B550M PRO-VDH WIFI Manufacturer specification · MSI lists a maximum Wi-Fi link rate of 433 Mb/s; this is not measured throughput. Only the 2.4 and 5 GHz bands are listed. MSI B550M PRO-VDH WIFI — manufacturer specifications | Realtek 8111H 1 Gb Ethernet | Realtek 8111HN 1 Gb Ethernet; Wi-Fi AC (802.11ac, 2.4/5 GHz); Bluetooth 4.2 |
Cooling headersDifferent SourcesMSI B550-A PRO Manufacturer specification · Board headers, not supplied fans or an assertion of current limits. MSI B550-A PRO — manufacturer specificationsMSI B550M PRO-VDH WIFI Manufacturer specification · No included fans or current limits inferred. MSI B550M PRO-VDH WIFI — manufacturer specifications | 1 CPU; 1 pump; 6 system fan headers | 1 CPU; 1 pump; 3 system fan headers |
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