ASUS Prime B550M-A/CSM AMD B550 Socket AM4 micro ATX
- AMD AM4 socket: Ready for RyzenTM 5000 Series/ 4000 G-Series/ 3000 Series Desktop Processors
- Comprehensive cooling: VRM heatsink, PCH heatsink, and Fan Xpert 2+
- Ultrafast connectivity: Dual M.2, PCIe 4.0, 1 Gb Ethernet, USB 3.2 Gen 2 Type-A
- Aura Sync RGB: Onboard addressable Gen 2 header for RGB LED strips, easily synced with Aura Sync-capable hardware
More Information
| Processor socket | Socket AM4 |
|---|---|
| Component for | PC |
| Motherboard form factor | Micro ATX |
| Compatible processor series | AMD Ryzen 3000 Series |
| SKU | 90MB14I0-M0EAYC |
| EAN | 4718017755535 |
| Manufacturer | ASUS |
| Availability | Y |
| PDF URLs |
View PDF |
Reasons To Buy
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.
Description
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.
ASUS Corporate Stable Model
ASUS Corporate Stable Model (CSM) is a commercial program designed to provide stable and reliable motherboards. Offering up to 36-month product lifecycle support and 6-month end-of-life notice to allow sufficient lead times for your organization to get ready for product transitions. Each purchase of an ASUS CSM motherboard comes with ASUS Control Center Express - server-grade IT management software.
* Lifecycle support for consumer chipsets (eg. Q370, H370, B360,H270,B250) is set at 15 months. Program offerings may vary by region. Please consult your local sales representative for more information.
ASUS Control Center Express
ASUS Control Center Express is an integrated IT monitoring and management software designed to deploy faster, simplify IT operations and improve productivity with comprehensive control and user-friendly functions. ASUS Control Center Express is compatible with over 100 ASUS motherboards to provide a high-quality, TCO-optimized solution for your business needs.
Optimize IT endpoint management
Designed to assist IT staff in monitoring and controlling devices within their corporate networks, and facilitate inventory checking in multiple locations remotely
Automate IT maintenance
Allows IT staff to schedule automatic updates of the latest BIOS, software and utilities to specific or all devices at off-peak times, enhancing system stability and IT operational flexibility
Securely manage all of endpoints
Securely manage endpoint configuration, portable storage access and PC software applications by enabling them to create grouping rules on individual devices
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 productiv
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.
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.
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.
Specifications
| Technical details | |
|---|---|
| Motherboard chipset family | AMD |
| Motherboard chipset | AMD B550 |
| On-board graphics card | No |
| Motherboard form factor | micro ATX |
| Component for | PC |
| Audio | |
| Audio output channels | 7.1 channels |
| Performance | |
| Windows operating systems supported | Windows 10 x64 |
| Motherboard chipset family | AMD |
| Motherboard chipset | AMD B550 |
| Audio output channels | 7.1 channels |
| Motherboard form factor | micro ATX |
| Component for | PC |
| Processor | |
| Processor manufacturer | AMD |
| Compatible processor series | AMD Ryzen 3000 Series |
| Processor socket | Socket AM4 |
| Memory | |
| Number of memory slots | 4 |
| Memory slots type | DIMM |
| Supported memory types | DDR4-SDRAM |
| Supported memory clock speeds | 2133,2400,2666,2800,3000,3200,3333,3466,3600,3733,3866,4000,4133,4266,4400,4600 MHz |
| Maximum internal memory | 128 GB |
| Unbuffered memory | Yes |
| Storage controllers | |
| Supported storage drive interfaces | M.2, SATA III |
| Graphics | |
| On-board graphics card | No |
| Internal I/O | |
| USB 3.2 Gen 2 (3.1 Gen 2) connectors | 0 |
| Supported storage drive interfaces | M.2, SATA III |
| USB 2.0 connectors | 2 |
| USB 3.2 Gen 1 (3.1 Gen 1) connectors | 1 |
| mSATA ports quantity | 0 |
| Number of SATA connectors | 0 |
| Number of SATA III connectors | 4 |
| Number of SATA II connectors | 0 |
| Number of Parallel ATA connectors | 0 |
| Number of chassis fan connectors | 2 |
| Front panel audio connector | Yes |
| EPS power connector (8-pin) | Yes |
| CPU fan connector | Yes |
| ATX Power connector (24-pin) | Yes |
| Rear panel I/O ports | |
|---|---|
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity | 4 |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-C ports quantity | 0 |
| USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity | 2 |
| USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity | 0 |
| USB 2.0 ports quantity | 0 |
| VGA (D-Sub) ports quantity | 1 |
| PS/2 ports quantity | 1 |
| Microphone in | Yes |
| Headphone outputs | 1 |
| HDMI ports quantity | 1 |
| Ethernet LAN (RJ-45) ports | 1 |
| DVI-D ports quantity | 1 |
| Network | |
| Ethernet LAN | Yes |
| Wi-Fi | No |
| LAN controller | Realtek RTL8111H |
| Ethernet interface type | Gigabit Ethernet |
| Features | |
| Windows operating systems supported | Windows 10 x64 |
| Motherboard chipset family | AMD |
| Motherboard chipset | AMD B550 |
| Audio output channels | 7.1 channels |
| Motherboard form factor | micro ATX |
| Component for | PC |
| Audio chip | Realtek ALC887 |
| Harmonized System (HS) code | 84733020 |
| Product colour | Black, Silver |
| Expansion slots | |
| PCI Express x1 (Gen 3.x) slots | 2 |
| PCI Express x16 (Gen 4.x) slots | 1 |
| BIOS | |
| BIOS type | UEFI AMI |
| Clear CMOS jumper | Yes |
| BIOS memory size | 256 Mbit |
| Software | |
| Windows operating systems supported | Windows 10 x64 |
| Logistics data | |
| Harmonized System (HS) code | 84733020 |
| Weight & dimensions | |
| Height | 51 mm |
| Weight | 845 g |
| Width | 244 mm |
| Depth | 244 mm |
| Other features | |
| Height | 51 mm |
| mSATA ports quantity | 0 |
| Weight | 845 g |
Delivery Details
- UK distributors.
- Order before 4 pm for next-day delivery.
- Standard (2-3 days) £7.50
- Next Day £9.99
- Free standard delivery over £100
There are deivery surcharges to these postcodes:
| Postcode | Charge |
| IV3-40 | £20 |
| IV52-54 | £20 |
| IV63 | £20 |
| KW1-14 | £20 |
| PA10-40 | £20 |
| PH19-40 | £20 |
| PH50 | £20 |
| HS | £50 |
| IV41-51 | £50 |
| IV55-56 | £50 |
| KA27-28 | £50 |
| KW15-17 | £50 |
| PA41-49 | £50 |
| PA60-62 | £50 |
| PA76-78 | £50 |
| PH41-44 | £50 |
| ZE | £50 |
| IM | £50 |
| JE | £50 |
| GY | £50 |
| TR21-25 | £50 |
| BT | £20 |
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|---|---|---|---|---|---|---|
| SKU |
90MB14I0-M0EAYC
|
B550M PRO-VDH WIFI
|
MPG B550 GAMING PLUS
|
90MB14U0-M0EAY0
|
90MB14I0-M0EAY0
|
90MB14V0-M0EAY0
|
| Manufacturer |
ASUS
|
MSI
|
MSI
|
ASUS
|
ASUS
|
ASUS
|
| Processor manufacturer |
AMD
|
AMD
|
AMD
|
AMD
|
AMD
|
AMD
|
| Motherboard form factor |
micro ATX
|
micro ATX
|
ATX
|
ATX
|
micro ATX
|
micro ATX
|
| Processor socket |
Socket AM4
|
Socket AM4
|
Socket AM4
|
Socket AM4
|
Socket AM4
|
Socket AM4
|
| Supported memory types |
DDR4-SDRAM
|
DDR4-SDRAM
|
DDR4-SDRAM
|
DDR4-SDRAM
|
DDR4-SDRAM
|
DDR4-SDRAM
|
| Component for |
PC
|
PC
|
PC
|
N/A
|
N/A
|
N/A
|
| Number of memory slots |
4 to 6
|
4 to 6
|
4 to 6
|
4 to 6
|
4 to 6
|
4 to 6
|