ASUS PRIME B550M-K mATX Motherboard | AM4 | 4x DDR4 Slots
KEY FEATURES
- AMD AM4 socket: Ready for 3rd Gen AMD Ryzen™ processors
- Comprehensive cooling: PCH heatsink and Fan Xpert 2+
- Ultrafast connectivity: Dual M.2, PCIe 4.0, 1 Gb Ethernet, USB 3.2 Gen 2 Type-A
- 5X Protection III: Multiple hardware safeguards for all-around system protection
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Frequently Asked Questions
How many memory slots does this motherboard have?
What cooling options are available with this motherboard?
Does the ASUS PRIME B550M-K support PCIe 4.0?
ASUS PRIME B550M-K mATX Motherboard | AM4 | 4x DDR4 Slots
Description
The ASUS PRIME B550M-K is a compact micro ATX motherboard built around AMD's B550 chipset, designed for mainstream Ryzen builds where space and value matter. With its AM4 socket, it supports AMD Ryzen 3000 series processors and offers the essential features most builders need without unnecessary extras. The mATX form factor makes it ideal for smaller cases while still providing room for expansion, making it a practical choice for office systems, budget gaming rigs, or compact home servers.
Memory support is comprehensive, with four DDR4 DIMM slots supporting up to 128GB at speeds from 2133MHz to 4600MHz - including XMP profiles for easy overclocking. The board includes dual M.2 slots for fast NVMe storage, plus a single PCIe 4.0 x16 slot for your graphics card and two PCIe 3.0 x1 slots for additional expansion cards. Connectivity covers the basics well with gigabit Ethernet, multiple display outputs (HDMI, D-Sub, and DVI for integrated graphics), and USB 3.2 Gen 2 Type-A ports for fast peripheral connections.
ASUS includes the standard package with an I/O shield, user documentation, and SATA cables to get you started. The B550 chipset provides modern features like PCIe 4.0 support for future graphics cards and storage while keeping costs reasonable. Setup is straightforward with ASUS's UEFI BIOS, and the board's layout provides good clearance around key components despite the compact mATX footprint.
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- Next Business Day: £6.99
- 2 days Delivery: £4.99
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| Processor | |
|---|---|
| Processor manufacturer | AMD |
| Processor socket | Socket AM4 |
| Compatible processor series | AMD Ryzen 3000 Series |
| Memory | |
|---|---|
| Supported memory types | DDR4-SDRAM |
| Number of memory slots | 4 |
| Memory slots type | DIMM |
| Supported memory clock speeds | 2133,2400,2666,2800,3000,3200,3333,3466,3600,3733,3866,4000,4133,4266,4400,4600 MHz |
| Maximum internal memory | 128 GB |
| Storage controllers | |
|---|---|
| Supported storage drive interfaces | M.2, SATA |
| Number of storage drives supported | 6 |
| RAID support | Yes |
| Internal I/O | |
|---|---|
| USB 2.0 connectors | 2 |
| USB 3.2 Gen 1 (3.1 Gen 1) connectors | 1 |
| ATX Power connector (24-pin) | Yes |
| Rear panel I/O ports | |
|---|---|
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity | 4 |
| USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity | 2 |
| Ethernet LAN (RJ-45) ports | 1 |
| PS/2 ports quantity | 1 |
| HDMI ports quantity | 1 |
| DVI-D ports quantity | 1 |
| Network | |
|---|---|
| Ethernet LAN | Yes |
| Ethernet interface type | Gigabit Ethernet |
| LAN controller | Realtek RTL8111H |
| Wi-Fi | No |
| Top Wi-Fi standard | Not available |
| Features | |
|---|---|
| Component for | PC |
| Motherboard form factor | micro ATX |
| Motherboard chipset family | AMD |
| Motherboard chipset | AMD B550 |
| Windows operating systems supported | Windows 10 |
| Harmonized System (HS) code | 84733020 |
| Expansion slots | |
|---|---|
| PCI Express x1 (Gen 3.x) slots | 2 |
| PCI Express x16 (Gen 4.x) slots | 1 |
| Number of M.2 (M) slots | 2 |
| BIOS | |
|---|---|
| BIOS type | UEFI AMI |
| BIOS memory size | 256 Mbit |
| Weight & dimensions | |
|---|---|
| Width | 244 mm |
| Depth | 244 mm |
| Height | 51 mm |
| Other features | |
|---|---|
| Weight | 785 g |
Frequently Asked Questions
How many memory slots does this motherboard have?
What cooling options are available with this motherboard?
Does the ASUS PRIME B550M-K support PCIe 4.0?
What processors are compatible with the ASUS PRIME B550M-K?
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