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ASUS Prime series is expertly engineered to unleash the full potential of 3rd Generation AMD Ryzen platform. Boasting a robust power design, comprehensive cooling solutions and intelligent tuning options, Prime B550 series motherboards provide daily users and DIY PC builders a range of performance tuning options via intuitive software and firmware features.
Tune It Your Way
Comprehensive controls form the foundation of the ASUS Prime series. The Prime B550 motherboard packs flexible tools to tune every aspect of your system, enabling you to tweak performance settings to perfectly match the way you work – maximizing your productivity.
Intelligent Control
EPU
All-around Energy Efficiency
With the Energy Processing Unit (EPU), you’ll enjoy system-wide power savings. The EPU automatically optimizes power consumption and maximizes savings with Away mode.
Fan Xpert 2+
Flexible Air- and Liquid-Cooling Controls
Fan Xpert 2+ software provides comprehensive control over system fans. Auto-Tuning mode intelligently configures all parameters with a single click. There’s also an Extreme Quiet mode that reduces chassis fan speeds to below the default minimum to keep your system whisper-quiet when performing light tasks. Fans can also be controlled via the UEFI BIOS.
Digi+ VRM Control
Precise Digital Power Control
The Digi+ voltage-regulator module (VRM) delivers real-time control over voltage droop, automatically switching frequency and power-efficiency settings. It also allows you to fine-tune your CPU for ultimate stability and performance.
The renowned ASUS UEFI BIOS provides everything you need to configure, tweak and tune your system. It offers intelligently simplified options for PC DIY beginners, as well as comprehensive features for seasoned veterans.
Advanced Mode
Advanced Tuning for Serious Tweakers
An intuitive Advanced mode offered via the UEFI lets you take complete control. A built-in search feature makes it easy to find options, and various Advanced functions let you intelligently make nuanced adjustments so you can dial in performance just the way you want.
EZ Mode
Quick and Simple Setup
EZ mode displays vital settings and stats and also offers guided wizards, drag-and-drop functionality, and one-click application of important settings — all to help you get your rig up and running in no time.
Prime B550M-K is engineered with an array of hybrid fan headers and features comprehensive cooling controls that are configurable via Fan Xpert 2+ software or via the UEFI BIOS, ensuring your rig stays cool and stable under intense workloads.
Multiple Temperature Sources
Each header can dynamically reference three thermal sensors. Fan Xpert 2+ allows you to map the temperature of supported ASUS graphics cards to optimize cooling for GPU- and CPU-intensive tasks.
Smart Protection
A dedicated integrated circuit protects each fan header from overheating and overcurrent.
4-Pin PWM/DC Fan
Each onboard chassis fan header supports PWM and DC mode.
Build on a Solid Foundation
Prime B550 motherboard provides all the fundamentals to boost daily productivity, so your system will be ready for action with stable power, intuitive cooling and flexible transfer options.
PCIe 4.0 M.2 (up to 64 Gbps)
Achieve speed with onboard M.2
PCIe 4.0 M.2 Slot supports up to 22110 and provide NVMe SSD RAID support for an incredible performance boost. Create a RAID configuration with up to PCIe 4.0 storage device to enjoy the fastest data-transfer speeds on the 3rd Generation AMD Ryzen platform.
USB 3.2 Gen 2
USB 3.2 Gen 2 Type-A
Numerous USB ports support high-end rigs loaded with peripherals, including two rear-panel USB Type-A connectors with fast USB 3.2 Gen 2 connectivity for compatible cases.
Little Things Make a Big Difference
Prime B550 series add the nuanced details that improve every experience, from exclusive codecs that provide pristine audio quality to intuitive interface that let you customize your system to create a uniquely personal look.
Outstanding Audio
Combined onboard features deliver elevated audio
Intelligent design and premium hardware create audio quality unlike anything you’ve ever experienced.
Audio Shielding - Separates analog/digital signal domains, significantly reducing multi-lateral interference.
Separate Layers for Left and Right Tracks - Ensures minimal crosstalk between audio paths.
Premium Japanese Capacitors - Premium parts provide an immersive sound signature, with exceptional fidelity.
Armoury Crate
Armoury Crate is a new software utility designed to give you centralized control of supported products, from a single intuitive interface. Armoury Crate provides control of settings for ASUS products, including keyboard and mouse preferences. This software even features dedicated product registration and highlight to help you stay in touch with the ASUS community.
SafeSlot Core
Fortified PCIe slot prevents damage
SafeSlot Core is the ASUS-exclusive PCIe slot. Featuring a fortified design that's anchored to the motherboard by a special hook, SafeSlot Core provides 1.6x stronger retention and 1.3x greater shearing resistance than standard expansion slots.
ASUS Prime motherboards have strengthened solder points around both the PCIe and DIMM pins.
Overvoltage Protection
World-class circuit-protecting power design
An exclusive circuit design with built-in voltage regulators to protect your motherboard from damage caused by unexpected high-level voltages from unstable or inferior power supplies.
DRAM Overcurrent Protection
Short-circuit damage prevention
Onboard resettable fuses prevent overcurrent and short-circuit damage. This extends beyond I/O ports to DRAM to safeguard the lifespan of your system and connected devices.
Stainless-steel Back I/O
3X corrosion-resistance for greater durability
Corrosion-resistant stainless-steel back I/O panels bonded with chromium oxide have a lifespan that's three times longer than ordinary panels.
LANGuard
Pumped-up throughput 2.5X higher surge tolerance
ASUS LANGuard is a hardware-level network protection feature that integrates advanced signal-coupling technology and premium anti-EMI surface-mounted capacitors to improve throughput and ensure a more reliable connection.
1000+
Compatible devices and components
The Prime B550 series provides superior compatibility with thousands of components and our Qualified Vendor List (QVL) identifies memory compatibility, giving you more choices for worry-free PC-building experiences.
8000+
Validation hours
Every ASUS motherboards is subjected to more than 8,000 hours of stringent tests, including burn-in, environmental, compatibility, software and safety tests to confirm their durability. ASUS reliability surpasses industry standards, ensuring that every component is designed to function flawlessly in any environment.
ASUS PRIME B550M-K DDR4 mATX Retail Motherboard
CPU
| CPU Socket | Socket AM4 |
| CPU Brand | AMD |
| Installed Processors (Max) | 0 (1) |
| Supported Processor Manufacturer | AMD |
| Supported Processors | 3rd Gen AMD Ryzen Processors |
| 64-bit Support | Yes |
| Socket | AM4 |
Rear Panel I/O Ports
| USB Ports | 2 x USB 3.1 4 x USB 3.0 |
| HDMI Port | 1 x HDMI 2.1 |
| VGA Port | 1 x D-Sub |
| Keyboard/Mouse Combo Port | 1 x PS/2 |
| RJ-45 Ports | 1 x RJ-45 |
| Digital Port | 1 x DVI-D |
| Audio Line In Ports | 1 x 3.5mm Jack |
| Audio Line Out Ports | 1 x 3.5mm Jack |
| Microphone In Port | 1 x 3.5mm Jack |
Internal I/O Connectors
| SATA Connectors | 4 x SATA III |
| USB Connectors | 1 x USB 3.0 header (supports 4 ports) 2 x USB 2.0 headers (supports 4 ports) |
| Speaker | 1 x Speaker header |
| Front Panel Connectors | 1 x Front Panel 1 x Front Audio |
| Cooling Fan Support | 1 x CPU fan header 2 x Chassis fan headers |
| S/PDIF Connectors | 1 x S/PDIF Out header |
| Serial Connectors | 1 x COM header |
| TPM Header | 1 x SPI TPM header |
| Power Connector Port | 1 x 20+4-pin ATX 1 x 4+4-pin EPS |
| Other Connectors | 1 x M.2, Socket 3, M Key (Type 2242/2260/2280/22110) 1 x M.2, Socket 3, M Key (Type 2242/2260/2280) |
Memory
| Memory Bus Speed | 4800(O.C.)/4600(O.C)/4466(O.C.)/4400(O.C)/4266(O.C.)/4133(O.C.)/4000(O.C.)/3866(O.C.)/3733(O.C.)/3600(O.C.)/3466(O.C.)/3333(O.C.)/3200/3000/2800/2666/2400/2133 MHz |
| Memory Type | DDR4 |
| Maximum RAM | 128 GB |
| Memory Slot | 4 x DIMM |
Motherboard
| Chipset Manufacturer | AMD |
| Northbridge | B550 |
| RAID Supported | Yes |
| RAID Format | RAID 0, 1, 10 |
| SATA Supported | Yes |
Expansion
| Number of PCI Express Slots | 1 x PCI Express 4.0 x16 2 x PCI Express 3.0 x1 |
Graphics Device
| Integrated Graphics Supported | Yes |
Sound
| Integrated Sound | Realtek ALC887 |
Warranty
| Warranty | 3 Years |
Network
| Integrated Network | Realtek RTL8111H |
| Network Speeds Supported | 10/100/1000 Mbps |
| Wireless LAN | No |
| Bluetooth | No |
System Requirements
| Operating Systems Supported | Microsoft Windows 10 64-bit |
System
| BIOS | 256 Mb Flash ROM, UEFI AMI BIOS |
| Jumpers | 1 x Clear CMOS |
| Software Included (may be trial or restricted) | Yes |
| Drivers | Yes |
Physical
| Form Factor | MicroATX Motherboard |
| In The Box | PRIME B550M-K Motherboard User Manual I/O Shield 2 x SATA Cables Support DVD 1 x M.2 Screw Package |
| Width | 244 mm |
| Length | 244 mm |
Key Features
| RGB Header Type | None |
| Addressable RGB | No |
| Firewire | No |
| Wireless Network | No |
| Memory Channel | Dual |
| On-board Audio Type | 7.1 |
| Number of SATA Ports | 4 port(s) |
| Number of USB Ports | 6 port(s) |
| SATA III Support | Yes |
| USB 3.0 Support | Yes |
| Multi GPU Support | No |
| VGA Connection | Yes |
| DVI Connection | Yes |
| HDMI Connection | Yes |
| DisplayPort Connection | No |
| Motherboard Form Factor | mATX |
| Motherboard Power Connectors | 4 + 4-Pin |
| Motherboard Chipset | AMD B550 |
| Thunderbolt | No |
| Motherboard Model | ASUS Prime B550M-K |
| USB 3.1 Support | Yes |
| Internal USB3.0 Header | Yes |
| M.2 Support | Yes |
| On-board RGB Control | None |
| Memory Speed | 4800 MHz |
Item Details
| Manufacturer | ASUS |
| Manufacturer Code | 90MB14V0-M0EAY0 |
| Alternative Part Numbers | B550M-K, PRIME B550M-K |
| EAN | 4718017758284 |
| Condition | New |
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