# ASUS Prime B550M-A/CSM AMD AM4 (3rd Gen Ryzen™) microATX Commercial Motherboard (PCIe 4.0, ECC Memory, 1Gb LAN, HDMI 2.1/D-Sub, 4K@60HZ, TPM, ASUS Control Center Express)

- Category: Motherboard
- Brand: ASUS
- Model: PRIME B550M-A/CSM
- Part number: PRIME B550M-A/CSM
- Price (US): currently unavailable
- Price last checked: 2026-08-06
- Rating: 4.3/5 from 334 Amazon reviews
- Warranty: 3 years
- Product page: https://buildmypc.net/component-details/motherboard/asus-prime-b550m-a-csm/

## Specifications

| Spec | Value |
| --- | --- |
| Brand | ASUS |
| Model | PRIME B550M-A/CSM |
| Socket Type | AM4 |
| Chipset | AMD B550 |
| Form Factor | Micro ATX |
| Memory Type | 4 x DDR4 |
| Max Memory Support | 128 GB |

## Key Features

- AMD AM4 Socket and PCIe 4. 0: The perfect pairing for 3rd Gen AMD Ryzen CPUs. Operating System-Windows 10 64-bit
- Fast Connectivity: 1Gb LAN, USB 3. 2 Gen 2 Type-C & Type-A ports, a front panel USB 3. 2 Gen 1 connector, plus HDMI 2. 1, D-Sub, and DVI display outputs
- First PCIe 4. 0 CSM motherboard: ASUS Corporate Stable Model with up to 36-month supply, EOL notice, and ECN control
- ASUS Control Center Express(ACCE) to make IT endpoint management simpler
- 5X Protection III: all-round protection with LANGuard, DRAM overcurrent protection, overvoltage protection, SafeSlot Core safeguards and stainless-steel back I/O

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