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General Information |
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Summary |
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.
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.
Search Function
Quickly and easily find the option or setting you need.
ASUS User Profile
Port configuration settings between different BIOS versions or share them with friends.
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.
Intuitive Graphical Fan Control
Fine-tune individual fan settings simply by dragging a curve with the mouse.
EZ XMP
Improve DRAM performance with one click.
Aura On/Off mode (Stealth)
Easily enable or disable Aura RGB lighting or every onboard LED, for a subdued aesthetic touch.
Cool to the Core
Prime B550 series is engineered with multiple onboard heatsinks and an array of hybrid fan headers to ensure your rig stays cool and stable under intense workloads.
VRM Heatsink and Thermal Pads
A VRM heatsink with underneath thermal pad improves heat transfer from the MOSFETs and chokes for better cooling performance.
Cooler by Design
Prime B550 series features comprehensive cooling controls that are configurable via Fan Xpert 2+ software or via the UEFI BIOS.
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.
802.11ac Wi-Fi
PRIME B550M-A AC has 802.11ac Wi-Fi with 1x1 2.4/5GHz antennas for up to 433.3Mbps transfer speeds to ensure that every connected user experiences the best wireless and online speeds!
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 RGB lighting controls 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 Layer for Left and Right Tracks
Ensures minimal crosstalk between audio paths.
Premium Japanese Capacitors
Premium parts provide an immersive sound signature, with exceptional fidelity.
Aura Sync
Outshine the Competition
A well-tuned enthusiast system deserves a matching aesthetic. ASUS Aura offers full RGB lighting control with a variety of functional presets for RGB LED strips connected to the onboard RGB headers. And it can all be synced with an ever-growing portfolio of Aura-capable hardware.
Addressable Gen 2 RGB Header
The addressable Gen 2 RGB header is now capable of detecting the number of LEDs on second-gen addressable RGB devices, allowing the software to automatically tailor lighting effects to specific devices. The new header also offers backward-compatibility with existing Aura RGB gear.
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 allows you to easily customize RGB lighting and effects for every compatible device in your arsenal. The software also provides control of settings for ASUS products, including keyboard and mouse preferences. Armoury Crate 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. |
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Processor |
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Processor manufacturer |
AMD |
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Processor socket |
Socket AM4 |
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Compatible processor series |
AMD Ryzen 3000 Series, AMD Ryzen 5000 Series |
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Supported processor sockets |
Socket AM4 |
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Memory |
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Supported memory types |
DDR4-SDRAM |
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Number of memory slots |
4 |
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Maximum internal memory |
128 GB |
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Memory slots type |
DIMM |
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Memory channels |
Dual-channel |
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ECC сompatibility |
ECC |
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Supported memory clock speeds |
2133,2400,2666,2800,3000,3200,3333,3466,3600,3733,3866,4000,4133,4266,4400,4466,4600,4800 MHz |
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Unbuffered memory |
Yes |
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Storage controllers |
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Supported storage drive interfaces |
M.2, PCI Express 3.0, PCI Express 4.0, SATA III |
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Supported storage drive types |
HDD & SSD |
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Number of storage drives supported |
6 |
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RAID support |
Yes |
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RAID levels |
0, 1, 10 |
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Graphics |
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Parallel processing technology support |
Not supported |
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Maximum resolution |
3840 x 2160 pixels |
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Internal I/O |
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USB 2.0 connectors |
2 |
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USB 3.2 Gen 1 (3.1 Gen 1) connectors |
1 |
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USB 3.2 Gen 2 (3.1 Gen 2) connectors |
0 |
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Number of SATA III connectors |
4 |
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S/PDIF out connector |
Yes |
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Front panel audio connector |
Yes |
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ATX Power connector (24-pin) |
Yes |
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Number of EATX power connectors |
1 |
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CPU fan connector |
Yes |
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Number of chassis fan connectors |
2 |
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EPS power connector (8-pin) |
Yes |
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Number of COM connectors |
1 |
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TPM connector |
Yes |
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12V power connector |
Yes |
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RGB LED pin header |
Yes |
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Rear panel I/O ports |
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USB 2.0 ports quantity |
0 |
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USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity |
4 |
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USB 3.2 Gen 1 (3.1 Gen 1) Type-C ports quantity |
0 |
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USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity |
2 |
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USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity |
0 |
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Ethernet LAN (RJ-45) ports |
1 |
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VGA (D-Sub) ports quantity |
1 |
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HDMI ports quantity |
1 |
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DVI-D ports quantity |
1 |
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PS/2 ports quantity |
1 |
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HDMI version |
2.1 |
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Headphone outputs |
3 |
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Microphone in |
Yes |
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WiFi-AP antenna jack |
1 |
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USB connector type |
USB Type-A |
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Network |
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Wi-Fi |
Yes |
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Ethernet LAN |
Yes |
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Ethernet interface type |
Gigabit Ethernet |
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LAN controller |
Realtek RTL8111H |
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Wake-on-LAN ready |
Yes |
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Top Wi-Fi standard |
Wi-Fi 5 (802.11ac) |
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Wi-Fi standards |
802.11a, 802.11b, 802.11g, Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac) |
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WLAN controller model |
Realtek RTL8821CE |
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Bluetooth |
Yes |
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Bluetooth version |
5.0 |
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Features |
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Component for |
PC |
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Motherboard form factor |
micro ATX |
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Motherboard chipset family |
AMD |
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Motherboard chipset |
AMD B550 |
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Audio output channels |
7.1 channels |
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Audio chip |
Realtek ALC887 / Realtek ALC897 |
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Windows operating systems supported |
Windows 10 x64 |
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Expansion slots |
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PCI Express x1 (Gen 3.x) slots |
2 |
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PCI Express x16 (Gen 3.x) slots |
1 |
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PCI Express x16 (Gen 4.x) slots |
1 |
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Number of M.2 (M) slots |
2 |
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BIOS |
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BIOS type |
UEFI AMI |
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BIOS memory size |
256 Mbit |
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Clear CMOS jumper |
Yes |
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Logistics data |
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Harmonized System (HS) code |
84733020 |
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Weight & dimensions |
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Width |
244 mm |
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Depth |
244 mm |
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Packaging content |
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Cables included |
SATA |
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Drivers included |
Yes |
