Four DDR4 slots let you start with a modest amount of RAM and add more modules later, without replacing the board. The two M.2 slots take compact SSDs, so you can keep the operating system on one drive and games, projects or media libraries on another. This keeps the case tidy and cuts down on cabling.
The standard ATX form factor fits a wide range of mid-tower and full-tower cases and leaves plenty of room between components for airflow and cooling. Wi-Fi is not built in, so plan to connect by cable or add a separate wireless adapter if you need one.
This board suits anyone building or upgrading a Socket AM4 desktop, from home and office PCs to gaming setups that need DDR4 memory and fast M.2 storage.
| Brand | MSI |
|---|---|
| BIOS type | UEFI |
| ACPI version | 6.0 |
| Bullet Points | <ul><li>Supports AMD Ryzen™ 5000 Series, 5000 G-Series, 4000 G-Series, and 3000 Series processors</li><li>Supports DDR4 Memory, up to 4800+ MT/s (OC)</li><li>Lightning Fast Experience: PCIe 4.0 slot and Lightning Gen4 x4 M.2</li><li>EZ DIY: EZ Debug LED and EZ Mounting</li><li>Audio Boost: Reward your ears with studio-grade sound quality</li><li>MSI Center: A brand-new software which integrates all MSI exclusive tools with user-friendly user interface.</li></ul> |
| Component for | PC |
| BIOS memory size | 256 |
| Long Description | MSI PRO B550-S. Processor manufacturer: AMD, Processor socket: Socket AM4, Compatible processor series: AMD Ryzen 3000 Series, AMD Ryzen 4000 Series, AMD Ryzen 5000 Series. Supported memory types: DDR4-SDRAM, Maximum internal memory: 128 GB, Memory slots type: DIMM. Supported storage drive interfaces: M.2, Micro SATA III, Supported storage drive types: HDD & SSD, RAID levels: 0, 1, 10. Ethernet interface type: Gigabit Ethernet, LAN controller: Realtek RTL8111H. Component for: PC, Motherboard form factor: ATX, Motherboard chipset family: AMD |
| Unbuffered memory | Yes |
| ECC сompatibility | Non-ECC |
| RGB LED pin header | Yes |
| PC health monitoring | CPU/Fan/Temperature |
| Number of memory slots | 4 |
| Motherboard form factor | ATX |
| Number of M.2 (M) slots | 2 |
| 1st M.2 largest key size | 22110 |
| 2nd M.2 largest key size | 2280 |
| PCI Express x1 (Gen 3.x) slots | 1 |
| PCI Express x16 (Gen 3.x) slots | 1 |
| PCI Express x16 (Gen 4.x) slots | 1 |
| 1st M.2 highest PCI Express generation | 4.0 |
| 2nd M.2 highest PCI Express generation | 3.0 |
| System Management BIOS (SMBIOS) version | 2.8 |
| Processor manufacturer | AMD |
|---|---|
| Motherboard chipset | AMD B550 |
| Processor socket | Socket AM4 |
| CPU fan connector | Yes |
| Motherboard chipset family | AMD |
| Compatible processor series | AMD Ryzen 3000 Series/AMD Ryzen 4000 Series/AMD Ryzen 5000 Series |
| Supported processor sockets | Socket AM4 |
| Number of CPU fan connectors | 1 |
| Maximum internal memory | 128 GB |
|---|---|
| Memory channels | Dual-channel |
| Memory slots type | DIMM |
| Number of HDDs supported | 4 |
|---|---|
| Supported storage drive types | HDD & SSD |
| Number of storage drives supported | 6 |
| Supported storage drive interfaces | M.2, Micro SATA III |
| On-board graphics card | Yes |
|---|
| Audio chip | Realtek ALC897 |
|---|---|
| Audio output channels | 7.1 |
| Front panel audio connector | Yes |
| HDMI ports quantity | 1 |
|---|---|
| HDMI version | 1.4 |
| USB 2.0 ports quantity | 4 |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity | 2 |
| USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity | 1 |
| USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity | 1 |
| Ethernet LAN | Yes |
| Ethernet LAN (RJ-45) ports | 1 |
| TPM connector | Yes |
| LAN controller | Realtek RTL8111H |
| USB 2.0 connectors | 4 |
| 12V power connector | Yes |
| Front panel connector | Yes |
| Ethernet interface type | Gigabit Ethernet |
| EPS power connector (8-pin) | Yes |
| ATX Power connector (24-pin) | Yes |
| Number of SATA III connectors | 4 |
| Total number of SATA connectors | 4 |
| Number of chassis fan connectors | 4 |
| USB 3.2 Gen 1 (3.1 Gen 1) connectors | 2 |
| USB 3.2 Gen 2 (3.1 Gen 2) connectors | 1 |
| Wi-Fi | No |
|---|
| Windows operating systems supported | Windows 10/Windows 11 |
|---|
| Power source type | ATX |
|---|
| RAID levels | 0/1/10 |
|---|---|
| Supported memory clock speeds | 2667/2800/2933/3000/3066/3200/3466/3600/3733/3866/4000/4133/4266/4400/4533/4600/4733/4800/4866 |
| Supported memory clock speed (max) | 4866 |
| RAID support | Yes |
|---|---|
| Supported memory types | DDR4-SDRAM |
| Parallel processing technology support | Not supported |
| Width | 243.84 mm |
|---|---|
| Depth | 304.8 mm |
| Product Net Weight | 0.7 kg |
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