Gigabyte B550M K B550 Micro ATX AM4 Motherboard - 128GB DDR4 PCIe 4.0
B550 Micro-ATX for AMD AM4 Ryzen 3000/4000/5000 Series. 128GB DDR4 (4xDIMM up to 4733MHz OC), PCIe 4.0 x16, dual M.2 (PCIe4/3), 4xSATA, HDMI 2.1, GbE LAN, no WiFi.
Available in 2–5 business days : 4 pieces
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The Gigabyte B550M K is a budget-friendly Micro-ATX motherboard designed for AMD AM4 socket processors including Ryzen 5000, 4000 G-Series, and 3000 Series CPUs. It features the AMD B550 chipset with PCIe 4.0 support for the primary x16 graphics slot and one M.2 slot, delivering high-speed storage and GPU performance. Dual-channel DDR4 memory supports up to 128GB across four DIMM slots with overclocking potential up to 4733MHz.
Storage options include two M.2 slots (one PCIe 4.0 x4 from CPU, one PCIe 3.0 x2 from chipset) both supporting 2280 drives in NVMe or SATA modes, plus four SATA III ports with RAID 0/1/10 support. Connectivity comprises 4x USB 3.2 Gen1 Type-A rear ports, Gigabit Ethernet via Realtek RTL8111H, HDMI 2.1 (4096×2160@60Hz), DisplayPort 1.4 (5120×2880@60Hz), and legacy PS/2. Audio is handled by Realtek ALC897 7.1-channel codec with noise guard protection.
- Key Features: 5+3 phase VRM, Smart Fan 5 with FAN STOP, Q-Flash Plus BIOS update, no RGB headers, no WiFi/Bluetooth
- Expansion: 1x PCIe 4.0 x16, 1x PCIe 3.0 x1
- Power: 24-pin ATX + 8-pin EPS
- OS Support: Windows 10/11 x64
| Processor manufacturer | AMD |
| Processor socket | Socket AM4 |
| Compatible processor series | AMD Ryzen 3000 Series, AMD Ryzen 4000 G-Series, AMD Ryzen 5000 Series, AMD Ryzen 5000 G-Series |
| Motherboard chipset | AMD B550 |
| Motherboard form factor | micro ATX |
| Supported memory types | DDR4-SDRAM |
| Number of memory slots | 4 |
| Memory slots type | DIMM |
| Memory channels | Dual-channel |
| ECC compatibility | ECC & Non-ECC Unbuffered |
| Maximum internal memory | 128 GB |
| Maximum internal memory per slot | 32 GB |
| Supported storage drive interfaces | M.2, SATA |
| Number of M.2 (M) slots | 2 |
| 1st M.2 largest key size | 2280 |
| 1st M.2 highest PCI Express generation | 4.0 |
| 2nd M.2 largest key size | 2280 |
| 2nd M.2 highest PCI Express generation | 3.0 |
| Number of SATA III connectors | 4 |
| RAID levels | 0, 1, 10 |
| PCI Express x16 (Gen 4.x) slots | 1 |
| PCI Express x1 (Gen 3.x) slots | 1 |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity | 4 |
| USB 2.0 ports quantity | 4 |
| Ethernet LAN (RJ-45) ports | 1 |
| Ethernet interface type | Gigabit Ethernet |
| LAN controller | Realtek RTL8111H |
| HDMI ports quantity | 1 |
| HDMI version | 2.1 |
| DisplayPorts quantity | 1 |
| DisplayPort version | 1.4 |
| Maximum resolution (HDMI) | 4096 x 2160@60 Hz |
| Maximum resolution (DP) | 5120 x 2880@60 Hz |
| Audio chip | Realtek ALC897 |
| Audio output channels | 7.1 channels |
| Power source type | ATX |
| Number of EPS power connectors (8-pin) | 1 |
| Number of CPU fan connectors | 1 |
| Number of chassis fan connectors | 1 |
| Windows operating systems supported | Windows 10 x64, Windows 11 x64 |
| Product colour | Brown |
| Width | 244 mm |
| Depth | 244 mm |
| Package width | 265 mm |
| Package depth | 265 mm |
| Package height | 54 mm |
| Package weight | 837 g |
| Warranty period | 3 year(s) |