|CPU Socket Type||AM4|
|CPU Type||BIOS update might require for AMD Zen 3 Ryzen 5000 series CPU. Refer to ASUS website for CPU support list.|
|Number of Memory Slots||4×288pin|
|Memory Standard||3rd Gen AMD Ryzen Processors
DDR4 4600(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 Un-buffered Memory *
3rd Gen AMD Ryzen with Radeon Graphics Processors
DDR4 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 Un-buffered Memory *
* Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists).
|Maximum Memory Supported||128GB|
|Channel Supported||Dual Channel|
|PCI Express 4.0 x16||3rd Gen AMD Ryzen Processors
1 x PCIe 4.0 x16 (x16 mode)
3rd Gen AMD Ryzen with Radeon Graphics Processors
1 x PCIe 3.0 x16 (x16 mode)
|PCI Express x1||AMD B550 Chipset
2 x PCIe 3.0 x1 slots
* Support PCIe bifurcation for RAID on CPU function.
|SATA 6Gb/s||4 x SATA 6Gb/s|
|M.2||3rd Gen AMD Ryzen 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
3rd Gen AMD Ryzen with Radeon Graphics 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
|Onboard Video Chipset||Supported only by CPU with integrated graphic:
1 x D-Sub
1 x DVI-D
1 x HDMI 2.1 (4K@60HZ)
|Audio Chipset||Realtek ALC887|
|Audio Channels||7.1 Channels
* A chassis with an HD audio module in the front panel is required to support 7.1-channel audio output.
|LAN Chipset||Realtek RTL8111H|
|Max LAN Speed||10/100/1000Mbps|
|Rear Panel Ports|
|Back I/O Ports||2 x USB 3.2 Gen 2 ports (2 x Type-A)
4 x USB 3.2 Gen 1 ports (4 x Type-A)
1 x D-Sub port
1 x DVI-D port
1 x HDMI port
1 x Realtek RTL8111H 1Gb Ethernet port
3 x Audio jacks
1 x PS/2 Keyboard/Mouse combo port
|Internal I/O Connectors|
|Onboard USB||1 x USB 3.2 Gen 1 header supports additional 2 USB 3.2 Gen 1 ports
2 x USB 2.0 headers support additional 4 USB 2.0 ports
|Other Connectors||1 x CPU Fan connector(s)
1 x CPU OPT Fan connector(s)
2 x Chassis Fan connector(s)
2 x Aura RGB Strip Headers
1 x Addressable Gen 2 header(s)
1 x SPI TPM header
1 x S/PDIF out header(s)
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
|Form Factor||Micro ATX|
|Dimensions (W x L)||9.6″ x 9.6″|
|Power Pin||1 x 24-pin Main Power connector
1 x 8-pin +12V Power connector
ASUS Exclusive Software
– Aura Creator
– Aura Sync
AI Suite 3
– Performance And Power Saving Utility
Fan Xpert 2+
– EZ update
Norton Anti-virus software (Free Trial for 60 days)
ASUS EZ DIY
– ASUS CrashFree BIOS 3
– ASUS EZ Flash 3
– ASUS UEFI BIOS EZ ModeASUS 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-DIMM
– ASUS Q-Slot
ASUS Thermal Solution
– Aluminum heatsink design
– Standard RGB headers
– Addressable Gen 2 RGB header
ASUS Lighting ControlBIOS:
256MB Flash ROM, UEFI AMI BIOS
1 x ACC Express Activation Key Card
2 x SATA 6Gb/s cable(s)
1 x Supporting DVD
1 x M.2 SSD screw package(s)
ASUS PRIME B550M-A AMD B550 (Ryzen AM4) Micro ATX Motherboard with Dual M.2, PCIe 4.0, 1 Gb Ethernet, HDMI/D-Sub/DVI, SATA 6 Gbps, USB 3.2 Gen 2 Type-A, And Aura Sync RGB Headers Support
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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.
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.
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
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.
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.
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.
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.
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 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.
Safe Slot 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.
LAN Guard. 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.