MSI B550-A PRO AM4 ATX Motherboard B550 DDR4 128GB PCIe 4.0 (Boxed)
MSI B550-A PRO ATX motherboard for AMD Ryzen 5000/4000G/3000 AM4. Supports DDR4 to 4400MHz(OC) up to 128GB, PCIe 4.0, 2x M.2 Shield Frozr, 6x SATA, USB 3.2 Gen2 Type-C, Realtek LAN & ALC892 7.1 audio. Core Boost power design.
Please Note
The website is currently being actively developed, you are welcome to place the order and in 99% of the cases your order will be processed as usual, but in some cases there may be a delay or the price may change. We will notify you if there are any issues.
Discontinued
This item was discontinued and currently is not available for order on our website. The item may become available soon. Please contact us if you need more information regarding the upcoming arrivals.
| Motherboards - CPU Socket | AMD AM4 |
|---|---|
| Motherboards - Chipset | AMD B550 |
| Motherboards - Form Factor | ATX |
| Motherboards - Memory Type | DDR4 |
| Motherboards - Memory Profile Support | None |
| Motherboards - Memory Slots | 4 |
| Motherboards - Max Memory Capacity | 128 GB |
| Motherboards - Main Slot PCIe Version | PCIe 4.0 |
| Motherboards - Color | Black |
| Motherboards - M.2 Slots | 2 |
| Motherboards - SATA Ports | 6 |
| Motherboards - USB-C Support | Rear Type-C |
| Motherboards - RGB Headers | None |
| Motherboards - Wireless Connectivity | None |
The MSI B550-A PRO is a reliable ATX motherboard based on the AMD B550 chipset, designed for AMD Socket AM4 processors including Ryzen 5000, 4000 G-Series, and 3000 Series desktop CPUs. It delivers excellent value for gaming, productivity, and mining builds with PCIe 4.0 support for GPUs and NVMe SSDs, plus a robust 10-phase VRM with Core Boost for stable overclocking.
Key features include dual-channel DDR4 memory up to 128GB at 4400MHz(OC), two M.2 slots with Shield Frozr cooling, six SATA III ports with RAID 0/1/10, and versatile rear I/O: 1x USB 3.2 Gen2 Type-C, 1x Gen2 Type-A, 2x Gen1 Type-A, 4x USB 2.0, HDMI, DisplayPort, Gigabit Realtek 8111H LAN, and PS/2. Audio Boost with Realtek ALC892 provides 7.1-channel studio-grade sound. Premium thermal solutions like extended heatsinks ensure non-stop performance.
- CPU Support: AMD Ryzen 5000/4000G/3000 Series (AM4)
- Memory: 4x DDR4 DIMM, Dual-channel, up to 128GB 4400+(OC)MHz
- Expansion: 1x PCIe 4.0 x16, 1x PCIe 3.0 x16, 2x PCIe 3.0 x1, 2-Way CrossFire
- Storage: 2x M.2 (PCIe 4.0/3.0), 6x SATA III
- Connectivity: USB-C 3.2 Gen2, Gigabit LAN, 7.1 Audio, Flash BIOS button
- Other: No WiFi/BT, 6x fan headers, black PCB
| Processor manufacturer | AMD |
| Processor socket | Socket AM4 |
| Compatible processor series | AMD Ryzen 5000 Series, AMD Ryzen 4000 G-Series, AMD Ryzen 3000 Series |
| Maximum number of SMP processors | 1 |
| Supported memory types | DDR4-SDRAM |
| Number of memory slots | 4 |
| Memory slots type | DIMM |
| Memory channels | Dual-channel |
| ECC compatibility | ECC & Non-ECC |
| Supported memory clock speeds | 1866,2133,2400,2667,2800,2933,3000,3066,3200,3466,3600,3733,3866,4000,4133,4266,4400 MHz (OC) |
| Maximum internal memory | 128 GB |
| Supported storage drive types | HDD & SSD |
| Supported storage drive interfaces | SATA III |
| RAID levels | 0, 1, 10 |
| Number of M.2 (M) slots | 2 |
| Number of SATA III connectors | 6 |
| Maximum graphics card memory | 16000 MB |
| Parallel processing technology support | 2-Way CrossFireX |
| Maximum resolution | 4096 x 2160 pixels |
| 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 (RJ-45) ports | 1 |
| PS/2 ports quantity | 1 |
| HDMI ports quantity | 1 |
| DisplayPorts quantity | 1 |
| Ethernet interface type | Gigabit Ethernet |
| LAN controller | Realtek 8111H |
| Motherboard chipset | AMD B550 |
| Audio chip | Realtek ALC892 |
| Audio output channels | 7.1 channels |
| Product colour | Black |
| Motherboard form factor | ATX |
| Number of chassis fan connectors | 6 |
| PCI Express x16 (Gen 4.x) slots | 1 |
| PCI Express x16 (Gen 3.x) slots | 1 |
| PCI Express x1 (Gen 3.x) slots | 2 |
| Width | 305 mm |
| Depth | 244 mm |
| Weight | 1 kg |