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MSI PRO B550-S
ATX motherboard Socket AM4 AMD B550 - 4x DDR4 - 2x M.2 + 4x SATA 6Gb/s - USB 3.1 - PCI-Express 4.0 16x
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A versatile motherboard for your AMD build
The MSI PRO B550-S is a motherboard designed for users looking for a reliable, high-performance platform for both work and entertainment. Compatible with AMD Ryzen processors from the 5000, 5000 G, 4000 G and 3000 series, it combines support for DDR4 memory, PCIe 4.0 connectivity and advanced cooling solutions. It also includes practical features to simplify PC installation, maintenance and everyday management.
Performance, cooling and connectivity
The MSI PRO B550-S features technologies designed to ensure your system runs smoothly. Its Core Boost architecture optimizes processor power delivery, while Memory Boost technology helps ensure memory signal stability. The motherboard supports DDR4 up to 4800+ MT/s (OC), depending on the configuration. For storage, it offers a Lightning M.2 Gen4 x4 slot paired with the M.2 Shield Frozr heatsink, designed to help reduce the risk of SSD thermal throttling. A large VRM heatsink and 7 W/mK thermal pads also help dissipate heat. Frozr AI Cooling technology automatically adjusts fan speeds according to CPU and graphics card temperatures. Finally, PCIe 4.0 connectivity, the reinforced Steel Armor slot and the front-panel USB Type-C header complete the feature set.
Key features:
- Motherboard MSI PRO B550-S compatible with AMD Ryzen 5000, 5000 G, 4000 G and 3000 series processors
- Supports DDR4 up to 4800+ MT/s (OC)
- Interface: PCIe 4.0 and Lightning M.2 Gen4 x4
- M.2 Shield Frozr heatsink for SSD cooling
- Core Boost and Memory Boost
- technologiesFrozr AI Cooling
- Smart fan control with EZ Debug LED and EZ Mounting features for easier installation and troubleshooting
- Front-panel USB Type-C header, Audio Boost technology and MSI Center
Select your criteria
General information |
Product name |
MSI PRO B550-S |
Brand |
MSI | |
Model |
PRO B550-S | |
Processor |
Processor support |
AMD AM4 |
Number of CPUs supported |
1 | |
Chipset |
Chipset |
AMD B550 |
Memory |
Memory format |
4 X DIMM 288-pin (DDR4) |
Memory Frequency(ies) |
DDR4 4866 MHz | |
| DDR4 4800 MHz | ||
| DDR4 4733 MHz | ||
| DDR4 4600 MHz | ||
| DDR4 4400 MHz | ||
| DDR4 4266 MHz | ||
| DDR4 4133 MHz | ||
| DDR4 4000 MHz | ||
| DDR4 3866 MHz | ||
| DDR4 3733 MHz | ||
| DDR4 1866 MHz | ||
| DDR4 2133 MHz | ||
| DDR4 2400 MHz | ||
| DDR4 2666 MHz | ||
| DDR4 2800 MHz | ||
| DDR4 2933 MHz | ||
| DDR4 3000 MHz | ||
| DDR4 3066 MHz | ||
| DDR4 3200 MHz | ||
| DDR4 3466 MHz | ||
| DDR4 3600 MHz | ||
Memory type |
DDR4 | |
Memory technology |
Dual Channel | |
Maximum RAM capacity per slot |
32 GB | |
Maximum RAM capacity |
128 GB | |
Graphic |
Integrated graphics controller |
No |
Compatible graphics core integrated in the CPU |
Yes | |
Expansion slots |
Graphic connector(s) |
1 X PCI Express 4.0 x16 |
| 1 X PCI Express 3.0 16x (x4) | ||
Number and Type of slots |
1 X PCI Express 3.0 x1 | |
Audio |
Audio Chipset |
Realtek ALC897 |
Number of audio channels |
8 | |
Network |
Number of ports/Ethernet controler |
1 X Realtek RTL8111H |
Network standard(s) |
10/100/1000 Mbps | |
Storage |
RAID supported |
Yes |
Hard drives connectors |
4 X Serial ATA 6Gb/s (SATA Revision 3) | |
| 1 X M.2 - PCI-E 4.0 x4 + SATA 6 Gb/s | ||
| 1 X M.2 - PCI-E 3.0 x4 | ||
Number of M.2 slot(s) |
2 | |
Supported RAID Modes |
10 | |
| 1 | ||
| 0 | ||
Connectivity |
Motherboard connector location |
Standard connectors (on the motherboard) |
Rear panel connectors |
3 X 3.5mm Jack Female Stereo | |
| 1 X MiniDin 6 Female (PS/2) | ||
| 1 X RJ45 Female | ||
| 4 X USB 2.0 | ||
| 2 X USB 3.0 | ||
| 1 X USB 3.1 | ||
| 1 X USB 3.1 Type C | ||
| 1 X HDMI Female | ||
Additional connectors |
1 X Internal USB 3.0 Type C | |
| 2 X Internal USB 3.0 | ||
| 4 X Internal USB 2.0 | ||
| 1 X ATX 24 Pin | ||
| 1 X +12V (Power supply P8) | ||
| Chassis intrusion | ||
| Front panel audio | ||
| TPM | ||
| 2 X Addressable LED RGB connector(s) | ||
| 1 X LED RGB connector(s) | ||
Physical characteristics |
Motherboard format |
ATX |
Length |
305 mm | |
Width |
244 mm | |
Colour |
Black | |
Equipment |
Advanced overclocking features |
Yes |
Use |
Gaming | |
| Multimedia | ||
LED |
No | |
Warranties |
Commercial warranty |
Seller 2 years
|
Legal warranty |
See terms & conditions
Harmonised legal guarantee notice
|
|
Safety Information |
Responsible person |
MSI Computer Europe B.V |
Postal address |
Science Park Eindhoven 5706 5692 ER Son, the Netherlands | |
Electronic Address |
gpsr@msi.com |
See all MSI products
Product referenced on 13 Nov 2026
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