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.
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.
Flexible 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.
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.
UEFI BIOS
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 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.
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.
Cooler by Design
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.
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
Achieve speed with onboard M.2 (up to 64 Gbps)
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
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 adds 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.
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.
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.
SPECIFICATIONS:
| Model | PRIME B550M-K |
| CPU | AMD AM4 Socket for AMD Ryzen™ 5000 Series/ 5000 G-Series/ 4000 G-Series/ 3000 Series Desktop Processors * |
| * Refer to www.asus.com for CPU support list | |
| Chipset | AMD B550 |
| Memory | 4 x DIMM, Max. 128GB, DDR4 4866(O.C)/4800(O.C.)/4600(O.C)/4466(O.C.)/ 4400(O.C)/4333(O.C.)/4266(O.C.)/4200(O.C.)/ 4133(O.C.)/4000(O.C.)/3866(O.C.)/3733(O.C.)/ 3600(O.C.)/3466(O.C.)/3400(O.C.)/3333(O.C.)/ 3200/3000/2933/2800/2666/2400/2133 MHz Un-buffered Memory * |
| Dual Channel Memory Architecture | |
| ECC Memory (ECC mode) support varies by CPU. | |
| * Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists), and memory frequency support depends on the CPU types. | |
| Graphic | 1 x D-Sub |
| 1 x DVI-D | |
| 1 x HDMI 2.1(4K@60HZ) | |
| *Graphics specifications may vary between CPU types. | |
| Expansion Slots | AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors |
| 1 x PCIe 4.0 x16 (x16 mode) | |
| AMD Ryzen™ 5000 G-Series/ 4000 G-Series Desktop Processors | |
| 1 x PCIe 3.0 x16 (x16 mode) | |
| AMD B550 Chipset | |
| 2 x PCIe 3.0 x1 | |
| Storage | Total supports 2 x M.2 slot(s) and 4 x SATA 6Gb/s ports |
| AMD Ryzen™ 5000 Series/ 3000 Series Desktop Processors : | |
| 1 x M.2_1 socket 3, with M Key, Type 2242/2260/2280/22110(PCIE 4.0 x4 and SATA modes) storage devices support | |
| AMD Ryzen™ 5000 G-Series/ 4000 G-Series Desktop Processors : | |
| 1 x M.2_1 socket 3, with M Key, Type 2242/2260/2280/22110(PCIE 3.0 x4 and SATA modes) storage devices support | |
| AMD B550 Chipset : | |
| 1 x M.2_2 socket 3, with M Key, Type 2242/2260/2280 (PCIE 3.0 x4 and SATA modes) storage devices support | |
| 4 x SATA 6Gb/s port(s), | |
| Support Raid 0, 1, 10 | |
| LAN | Realtek RTL8111H 1Gb Ethernet |
| ASUS LANGuard | |
| Audio | Realtek ALC887/897 7.1 Surround Sound High Definition Audio CODEC * |
| – Supports : Jack-detection, Multi-streaming, Front Panel Jack-retasking, up to 24-Bit/192kHz playback | |
| Audio Feature : | |
| – LED-illuminated design | |
| – Audio Shielding | |
| – Dedicated audio PCB layers | |
| – Premium Japanese audio capacitors | |
| * Choose the chassis with HD audio module in front panel to support 8-channel audio output. | |
| USB Ports | Rear USB Port ( Total 6 ) |
| 2 x USB 3.2 Gen 2 port(s)(2 x Type-A) | |
| 4 x USB 3.2 Gen 1 port(s)(4 x Type-A) | |
| Front USB Port ( Total 6 ) | |
| 2 x USB 3.2 Gen 1 port(s)(2 x Type-A) | |
| 4 x USB 2.0 port(s)(4 x Type-A) | |
| Software Features | ASUS Exclusive Software |
| Armoury Crate | |
| AI Suite 3 | |
| – Performance And Power Saving Utility | |
| TurboV EVO | |
| EPU | |
| Digi+ VRM | |
| Fan Xpert 2+ | |
| – EZ update | |
| ASUS CPU-Z | |
| AI Charger | |
| DAEMON Tools | |
| Norton Anti-virus software (Free Trial for 60 days) | |
| WinRAR | |
| UEFI BIOS | |
| ASUS EZ DIY | |
| – ASUS CrashFree BIOS 3 | |
| – ASUS EZ Flash 3 | |
| – ASUS UEFI BIOS EZ Mode | |
| ASUS Special Features | ASUS 5X PROTECTION III |
| – ASUS DIGI+ VRM | |
| – ASUS LANGuard | |
| – ASUS Overvoltage Protection | |
| – ASUS SafeSlot Core | |
| – ASUS Stainless-Steel Back I/O | |
| ASUS Q-Design | |
| – ASUS Q-DIMM | |
| – ASUS Q-Slot | |
| ASUS Thermal Solution | |
| – Aluminum heatsink design | |
| ASUS Lighting Control | |
| Back I/O Ports | 1 x PS/2 keyboard/mouse combo port(s) |
| 1 x DVI-D | |
| 1 x D-Sub | |
| 1 x HDMI | |
| 1 x LAN (RJ45) port(s) | |
| 2 x USB 3.2 Gen 2 (teal blue) (2 x Type-A) | |
| 4 x USB 3.2 Gen 1 (blue) Type-A | |
| 3 x Audio jack(s) | |
| Internal I/O Ports | 1 x CPU Fan connector(s) |
| 2 x Chassis Fan connector(s) | |
| 1 x USB 3.2 Gen 1(up to 5Gbps) connector(s) support(s) additional 2 USB 3.2 Gen 1 port(s) | |
| 2 x USB 2.0 connector(s) support(s) additional 4 USB 2.0 port(s) | |
| 1 x M.2 Socket 3 with M Key, type 2242/2260/2280/22110 storage devices support (SATA mode & X4 PCIE mode) | |
| 1 x M.2 Socket 3 with M Key, type 2242/2260/2280 storage devices support (SATA mode & X4 PCIE mode) | |
| 1 x SPI TPM header | |
| 4 x SATA 6Gb/s connector(s) | |
| 1 x S/PDIF out header(s) | |
| 1 x 24-pin EATX Power connector(s) | |
| 1 x 8-pin EATX 12V Power connectors | |
| 1 x Front panel audio connector(s) (AAFP) | |
| 1 x Clear CMOS jumper(s) | |
| 1 x System panel connector | |
| 1 x COM port header | |
| 1 x Speaker connector | |
| Accessories | User´s manual |
| I/O Shield | 2 x SATA 6Gb/s cable(s) |
| 1 x Supporting DVD | |
| 1 x M.2 SSD screw package(s) | |
| BIOS | 256 Mb Flash ROM, UEFI AMI BIOS |
| Manageability | WOL by PME, PXE |
| Operating System | Windows® 10 64-bit |
| Form Factor | mATX Form Factor |
| 9.6 inch x 9.6 inch ( 24.4 cm x 24.4 cm ) |
