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ASUS PRIME B550M-K ARGB micro-ATX AM4 motherboard with two DDR4 slots, up to 64GB, dual M.2, CPU-dependent PCIe 4.0, Gigabit Ethernet and front USB-C support.
R2,249.00
In Stock with Supplier 2 — 10 avail
Clear fulfilment, warranty and payment details.
ASUS • PRIME B550M-K ARGB
The PRIME B550M-K ARGB combines the familiar AM4 platform with dual M.2 storage, wired Gigabit networking and addressable lighting connections. Its two-slot DDR4 layout and compact micro-ATX footprint suit a carefully planned PC, with CPU-dependent PCIe support and front USB-C connectivity kept clearly in view.
AM4 platform
ASUS lists Ryzen 5000, 5000 G-Series, 4000 G-Series and 3000 Series desktop processors. Match the exact processor to the CPU support list and required BIOS rather than treating the AM4 socket alone as approval. HDMI and DisplayPort need a processor with suitable integrated graphics; a CPU without graphics needs a discrete card.
Memory layout
The board supports up to 64GB of unbuffered DDR4 across two channels. The manual explicitly lists modules up to 32GB each, so a matched two-module kit can use both channels while occupying both slots. ASUS lists rates up to DDR4-5100 with overclocking; supported speed and ECC operation depend on the CPU and memory configuration.
Graphics and drives
With the listed Ryzen 5000 and 3000 desktop families, the primary graphics slot and M.2_1 support PCIe 4.0. The listed 5000 G-Series and 4000 G-Series run those connections at PCIe 3.0. A chipset M.2_2 position, four SATA ports and a PCIe 3.0 x1 slot provide additional choices. Both M.2 positions support PCIe and SATA modes, with different supported drive lengths.
Everyday connections
Four rear USB 5Gbps Type-A ports and two USB 2.0 ports handle peripherals, with internal headers for a front USB-C port, two more 5Gbps ports and four USB 2.0 ports. Realtek 1Gb Ethernet provides the wired network connection. Rear audio and the case’s HD-audio module work together for supported 7.1-channel output.
Cooling and lighting
A chipset heatsink, hybrid fan control and Fan Xpert 2+ support the cooling setup. The board provides one CPU-fan header and two chassis-fan headers, along with a 24-pin main power connector and an 8-pin CPU power connector. Three Addressable Gen 2 headers connect compatible lighting for Aura Sync control; lighting devices and case fans are separate components.
Assembly details
Q-DIMM and Q-Slot help with component installation, while Q-LED Core supports power-LED diagnostic signalling. The UEFI offers EZ Mode and ASUS EZ Flash 3, with CrashFree BIOS 3 recovery support. Confirm the chassis standoff pattern and the 24.4 × 22.1cm board dimensions, and use the supplied I/O shield when fitting the motherboard.
| Exact model | PRIME B550M-K ARGB; distinct from non-ARGB PRIME B550M-K |
|---|---|
| Socket / chipset | AMD AM4 / B550 |
| CPU support | Ryzen 5000 / 5000 G-Series / 4000 G-Series / 3000 Series desktop; exact CPU and required BIOS per ASUS support |
| Memory slots / channels | 2 × DDR4 DIMM; dual channel |
| Maximum total / module | 64GB total; manual explicitly lists 2/4/8/16/32GB unbuffered modules |
| Memory rate | DDR4-2133 through 3200 standard listed rates; up to 5100 (OC); exact CPU, kit and population dependent |
| ECC qualification | ECC mode varies by CPU; not a universal system ECC guarantee |
| Memory population | Matched compatible modules in DIMM_A and DIMM_B for two-channel operation; unequal capacity has partial single-channel mapping |
| Primary graphics slot | 1 × x16 slot: PCIe 4.0 x16 with listed Ryzen 5000/3000; PCIe 3.0 x16 with 5000G/4000G |
|---|---|
| Additional slot | 1 × PCIe 3.0 x1 from B550 |
| M.2_1 | Key M; 2242/2260/2280; PCIe 4.0 x4 or SATA with 5000/3000; PCIe 3.0 x4 or SATA with 5000G/4000G |
| M.2_2 | Key M; 2242/2260/2280/22110; PCIe 3.0 x4 or SATA, B550 |
| SATA ports | 4 × SATA 6Gb/s |
| RAID | AMD RAIDXpert2 PCIe and SATA RAID 0/1/10 |
| Adapter / lane planning | Check exact CPU, bifurcation support and manual before multi-drive adapter installation |
| Ethernet | Realtek 1Gb Ethernet; wired network |
|---|---|
| Wireless | No onboard Wi-Fi or Bluetooth listed for this model |
| Display outputs | DisplayPort 1.4 and HDMI 2.1; up to 4K60 listed, CPU graphics dependent |
| Rear USB | 4 × USB 3.2 Gen 1 5Gbps Type-A; 2 × USB 2.0 Type-A |
| Front USB support | 1 × USB 3.2 Gen 1 5Gbps Type-C connector; 1 × header for 2 further 5Gbps ports; 2 × USB 2.0 headers for 4 ports |
| Other rear ports | 3 audio jacks; PS/2 keyboard/mouse combo; Gigabit Ethernet |
| Audio | Realtek 7.1 HD; up to 24-bit/192kHz; jack detection/multistream/front retasking |
| 7.1 audio requirement | Case front HD-audio module required for 7.1 output; not eight discrete rear outputs |
| Power connectors | 24-pin main; 8-pin +12V CPU |
|---|---|
| Fan headers | 1 × 4-pin CPU fan; 2 × 4-pin chassis fan |
| Lighting | 3 × Addressable Gen 2 headers; Aura Sync |
| Other headers | Clear CMOS; COM; AAFP audio; S/PDIF out; speaker; 14-1 pin SPI TPM; 10-1 pin system panel |
| Protection / assembly | DIGI+ VRM; LANGuard; overvoltage protection; SafeSlot Core; stainless back I/O; Q-DIMM; Q-Slot; Q-LED Core |
| Firmware / management | 128Mb Flash ROM; UEFI AMI; EZ Flash 3; CrashFree BIOS 3; WOL by PME; PXE |
| OS | Windows 11 / Windows 10 64-bit as listed; exact driver and CPU support applies |
| Form factor / size | micro-ATX; 24.4 × 22.1cm |
| Package | Motherboard; 2 SATA 6Gb/s cables; I/O shield; M.2 SSD screw package; user guide |
| Software options | Armoury Crate / Aura Sync; AI Suite 3 / Fan Xpert 2+; ASUS CPU-Z; software availability and OS conditions apply |
| Supplier-listed warranty / colour | 36 months, applicable local terms require confirmation / black |
Check the exact CPU support entry, required BIOS and qualified memory population before ordering components. Memory OC and wireless capabilities depend on the complete configuration. Supplier lists 36 months warranty; confirm the applicable local terms and proof-of-purchase requirements.
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