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.
Amazon links open search results. Check the exact variant, current price and availability with the retailer.
Manufacturer specifications6 verified differences, led by Memory type, slots and limit, network interfaces and onboard audio hardware. 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 DDR4-5100+ (OC), a PCIe 4.0 x16 graphics slot, two M.2 slots (one PCIe 4.0 x4) and two wired Ethernet ports (Realtek 2.5 Gb and 1 Gb).
Specifications checked 7 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.
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.
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.
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.
6 verified differences, most decision-relevant first. All are also drawn in Visual facts above. Missing information stays separate.
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 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 MAG B550 TOMAHAWK — 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 · Two separate wired ports, not a combined 3.5 Gb link. MSI lists no Wi-Fi or Bluetooth hardware for this board.
MSI MAG B550 TOMAHAWK — manufacturer specificationsCheck the exact configuration and source conditions for your use.
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 specificationsManufacturer specification · Manufacturer-listed onboard audio hardware, not a measured sound-quality result. Where alternatives are listed, no particular unseen controller revision is promised.
MSI MAG B550 TOMAHAWK — manufacturer specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification · Plan storage drives and expansion cards together; this restriction applies to this board's slot wiring.
MSI B550-A PRO — manufacturer specificationsManufacturer specification · Plan storage drives and expansion cards together; this restriction applies to this board's slot wiring.
MSI MAG B550 TOMAHAWK — manufacturer specificationsCheck the exact configuration and source conditions for your use.
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 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 MAG B550 TOMAHAWK — 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 · Port inventory and interface ratings, not simultaneous measured throughput or charging power.
MSI MAG B550 TOMAHAWK — manufacturer specificationsCheck the exact configuration and source conditions for your use.
18 shared fields have the same recorded value.
| Specification | MSI B550-A PRO | MSI MAG B550 TOMAHAWK |
|---|---|---|
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 MAG B550 TOMAHAWK Manufacturer specification · Match the exact CPU and required BIOS as well as the physical socket. MSI MAG B550 TOMAHAWK — manufacturer specifications | AM4 | AM4 |
Chipset Sources | AMD B550 | AMD B550 |
Form factor 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 MAG B550 TOMAHAWK Manufacturer specification · Board dimensions, not retail packaging. Check case mounting positions, clearance and cable routing. MSI MAG B550 TOMAHAWK — manufacturer specifications | ATX; 305 × 244 mm | ATX; 305 × 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 MAG B550 TOMAHAWK 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 MAG B550 TOMAHAWK — 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 MAG B550 TOMAHAWK Manufacturer specification · Button presence only. Recovery procedure and USB preparation require the exact manual. MSI MAG B550 TOMAHAWK — 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 MAG B550 TOMAHAWK 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 MAG B550 TOMAHAWK — 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 DDR4-5100+ (OC); A-XMP; non-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 MAG B550 TOMAHAWK 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 MAG B550 TOMAHAWK — 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 MAG B550 TOMAHAWK Manufacturer specification · Physical DDR4 module positions, not included modules. Consult the board manual for population order and compatible capacities. MSI MAG B550 TOMAHAWK — manufacturer specifications | 4 | 4 |
Published memory OC configurationsDifferent 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 MAG B550 TOMAHAWK 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 MAG B550 TOMAHAWK — manufacturer specifications | 1DPC 1R up to 4800; 1DPC 2R up to 3866; 2DPC 1R up to 4000; 2DPC 2R up to 3600 | 1DPC 1R up to 5100; 1DPC 2R up to 3866; 2DPC 1R up to 4000; 2DPC 2R up to 3600 |
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 MAG B550 TOMAHAWK Manufacturer specification · ECC modules run in non-ECC mode, so error correction is not active. MSI MAG B550 TOMAHAWK — manufacturer specifications | ECC UDIMM supported in non-ECC mode | ECC UDIMM supported in non-ECC mode |
Storage interfaces 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 MAG B550 TOMAHAWK 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. If M2_2, PCI_E2 and PCI_E3 are all populated, PCI_E3 is unavailable and M2_2 runs at x2. MSI MAG B550 TOMAHAWK — 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; 6 × 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 MAG B550 TOMAHAWK Manufacturer specification · Onboard M.2 storage positions only. M.2 generation depends on the CPU. If M2_2, PCI_E2 and PCI_E3 are populated simultaneously, PCI_E3 becomes unavailable and M2_2 runs at x2. MSI MAG B550 TOMAHAWK — manufacturer specifications | 2 | 2 |
SATA storage ports 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 MAG B550 TOMAHAWK Manufacturer specification · SATA 6 Gb/s connectors, not supplied drives or power cables. M.2 generation depends on the CPU. If M2_2, PCI_E2 and PCI_E3 are populated simultaneously, PCI_E3 becomes unavailable and M2_2 runs at x2. MSI MAG B550 TOMAHAWK — manufacturer specifications | 6 | 6 |
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 MAG B550 TOMAHAWK Manufacturer specification · Requires compatible drives and array configuration; no data protection guarantee. MSI MAG B550 TOMAHAWK — 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 MAG B550 TOMAHAWK Manufacturer specification · Requires compatible drives and array configuration; no data protection guarantee. MSI MAG B550 TOMAHAWK — 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 MAG B550 TOMAHAWK Manufacturer specification · PCIe 4.0 or 3.0 depending on the installed processor; not a measured graphics performance result. MSI MAG B550 TOMAHAWK — manufacturer specifications | PCI_E1: PCIe 4.0 x16 | PCI_E1: PCIe 4.0 x16 |
Secondary expansion slots 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 MAG B550 TOMAHAWK Manufacturer specification · With M2_2, PCI_E2 and PCI_E3 populated together, PCI_E3 is disabled and M2_2 runs x2. MSI MAG B550 TOMAHAWK — manufacturer specifications | 1 long PCIe 3.0 slot wired x4; 2 PCIe 3.0 x1 slots | 1 long PCIe 3.0 slot wired x4; 2 PCIe 3.0 x1 slots |
Expansion/storage lane sharingDifferent 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 MAG B550 TOMAHAWK Manufacturer specification · Plan storage drives and expansion cards together; this restriction applies to this board's slot wiring. MSI MAG B550 TOMAHAWK — manufacturer specifications | Installing a PCIe SSD in M2_2 makes PCI_E3 unavailable. | With M2_2, PCI_E2 and PCI_E3 populated together, PCI_E3 is disabled and M2_2 runs x2. |
Onboard audio hardwareDifferent 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 MAG B550 TOMAHAWK 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 MAG B550 TOMAHAWK — manufacturer specifications | Realtek ALC892 or ALC897 codec; 7.1-channel | Realtek ALC1200 or ALC1220P codec; 7.1-channel |
Processor-dependent display outputs SourcesMSI B550-A PRO Manufacturer specification · Requires integrated CPU graphics; supported modes depend on processor. MSI B550-A PRO — manufacturer specificationsMSI MAG B550 TOMAHAWK Manufacturer specification · Requires integrated CPU graphics; supported modes depend on processor. MSI MAG B550 TOMAHAWK — manufacturer specifications | HDMI 2.1 and DisplayPort: up to 4096×2160 at 60 Hz | HDMI 2.1 and DisplayPort: up to 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 MAG B550 TOMAHAWK Manufacturer specification · Port inventory and interface ratings, not simultaneous measured throughput or charging power. MSI MAG B550 TOMAHAWK — 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; 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 SourcesMSI B550-A PRO Manufacturer specification · Requires compatible case ports and cabling; not rear sockets. MSI B550-A PRO — manufacturer specificationsMSI MAG B550 TOMAHAWK Manufacturer specification · Requires compatible case ports and cabling; not rear sockets. MSI MAG B550 TOMAHAWK — 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 MAG B550 TOMAHAWK Manufacturer specification · Two separate wired ports, not a combined 3.5 Gb link. MSI lists no Wi-Fi or Bluetooth hardware for this board. MSI MAG B550 TOMAHAWK — manufacturer specifications | Realtek 8111H 1 Gb Ethernet | Realtek 8125B 2.5 Gb Ethernet; Realtek 8111H 1 Gb Ethernet |
Cooling headers SourcesMSI B550-A PRO Manufacturer specification · Board headers, not supplied fans or an assertion of current limits. MSI B550-A PRO — manufacturer specificationsMSI MAG B550 TOMAHAWK Manufacturer specification · Board headers, not supplied fans or an assertion of current limits. MSI MAG B550 TOMAHAWK — manufacturer specifications | 1 CPU; 1 pump; 6 system fan headers | 1 CPU; 1 pump; 6 system fan headers |
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.
