Asus PRIME B350M-A/CSM w/ DDR4 2666 7.1 Audio, M.2, Gigabit LAN, PCI-E x16

MX65654 PRIME B350M-A/CSM w/ DDR4 2666 7.1 Audio, M.2, Gigabit LAN, PCI-E x16
MX65654 PRIME B350M-A/CSM w/ DDR4 2666 7.1 Audio, M.2, Gigabit LAN, PCI-E x16 MX65654 PRIME B350M-A/CSM w/ DDR4 2666 7.1 Audio, M.2, Gigabit LAN, PCI-E x16 MX65654 PRIME B350M-A/CSM w/ DDR4 2666 7.1 Audio, M.2, Gigabit LAN, PCI-E x16 MX65654 PRIME B350M-A/CSM w/ DDR4 2666 7.1 Audio, M.2, Gigabit LAN, PCI-E x16

Product Info

ASUS Corporate Stable Model for next generation AMD® Ryzen™ AM4 processors.

Powered by AMD® Ryzen™ AM4 processors, the ASUS Prime B350M-A/CSM delivers performance and reliability in microATX form with ASUS Corporate Stable Model complimentary advance replacement and guaranteed long product lifecycle. Access next-generation connectivity and speeds with NVMe M.2, USB 3.1, DDR4 support and Gigabit LAN.

ASUS Prime is the next evolution of the ASUS motherboard, born of a pedigree that stretches back to 1989. Our team of world-class engineers are passionate about empowering everyone to enjoy the benefits of customization and tuning, and the driving force behind the development of Prime is to make advanced enthusiasts controls easily accessible-maximizing performance, stability, and compatibility for the very best DIY PC experiences. Simply stated: its time for Prime.


Built to Last

ASUS is the world's foremost motherboard manufacturer, renowned for our unique Design Thinking approach. Our exhaustive testing exceeds industry standards, supported by high-quality components for exceptional real-world protection. Our motherboards are proven to be compatible with more than 1,000 components and devices, and each new model undergoes a minimum of 8,000 hours of strict validation. ASUS gives you the peace of mind of knowing that your motherboard is fit for all environments and applications. By choosing ASUS, you also gain the freedom to select outstanding component options, for trouble-free DIY experiences.

SafeSlot Core

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 LANGuard is hardware-level networking protection that employs signal-coupling technology and premium anti-EMI surface-mounted capacitors to ensure a more reliable connection and better throughput, plus electrostatically guarded and surge-protected components for greater tolerance to static electricity and improved protection against surges.

Overvoltage Protection

World-class circuit-protecting power design
An exclusive circuit design with built-in voltage regulators to protect your chipset, connectivity ports, and audio codecs from damage caused by unexpected high-level voltages from unstable or inferior power supplies.

ESD Guards

Electrostatic discharge protection
ASUS ESD Guards prevent damage from electrostatic discharge, up to +/- 10kV for air discharge and +/- 6kV for contact discharge, arranged in an active-protective-circuit design that prolongs the life of components.

Proven Compatibility

Tested to be compatible with 1,000+ CPUs, DDR4 memory modules, graphics cards and more
Having the freedom to pick and choose the parts that go into your machine is at the heart of PC DIY. Our extensive certification program focuses on providing the very best compatibility with the widest range of components and devices, giving you the freedom to build and upgrade without frustration. Compatible today and compatible far into the future - that's the ASUS way.

Extensive List of Supported Devices Great Compatibility with ASUS Products

ASUS offers a suite of proprietary components — graphics cards, sound cards, optical drives — that perfectly complement Prime B350 series, so you can complete your custom motherboard build with confidence!

Top-to-bottom Reliability

ASUS motherboards have superb endurance. We verify this by subjecting every board to more than 8,000 hours of stringent tests. A barrage of burn-in, environmental, compatibility, software and safety tests confirm that our motherboards are exceptionally robust. It also shows that ASUS reliability surpasses industry standards, ensuring that every component is designed to function flawlessly in any environment.

Fan Xpert

Dedicated CPU and case fan controls
Exclusive Fan Xpert ensures every fan achieves the best balance of cooling performance and low noise - and with Prime B350 series boards and their hardware-level 4-pin/3-pin PWM/DC mode for case fans, a simple BIOS adjustment lets you run your case fan in PWM/DC. Fan Xpert even includes Auto-Tuning mode to scan and detect all fan characteristics for single-click customization!

Brighten Up Your Build

LED-illuminated control for PCIe slot and trace paths
Built-in LED lighting options can illuminate your build in a variety of mesmerizing styles. With specially-designed Fan RGB header control, you can even personalize your own fan lighting scheme with the exclusive AMD RGB Fan!

Superior Audio

Combined onboard features deliver elevated audio
Intelligent design and premium hardware create audio quality unlike anything you've ever experienced!

Energy Efficient Design

EPU-With the Energy Processing Unit (EPU), you'll enjoy the system power savings. EPU automatically optimizes power consumption, and maximizes savings with Away mode.

Ultrafast Transfer Speeds

10Gb/s USB 3.1 Onboard
With backward-compatible USB 3.1 Type-A, you'll experience ultimate connection flexibility and blazing data-transfer speeds of up to 10Gb/s (twice as fast as standard USB 3.0).

Speed Up with Onboard M.2 Up to 32Gb/s
With x4 PCI Express 3.0/2.0 bandwidth, M.2 supports up to 32Gb/s data-transfer speeds. It is the perfect choice for an operating system or application drive, making your whole PC or professional apps work as fast as possible.


CPU AM4 socket for AMD Ryzen™/7th Generation A-series/Athlon™ Processors
Supports CPU up to 8 cores*

* Due to CPU limitation, CPU cores supported varies by processor.
** Refer to for CPU support list

Chipset AMD B350 Chipset
Memory AMD Ryzen™ Processors:
4 x DIMMs, max. 64GB, DDR4 2666/2400/2133 MHz,ECC and non-ECC, un-buffered memory

AMD 7th Generation A-series/Athlon™ Processors:
4 x DIMMs, max. 64GB, DDR4 2400/2133 MHz, non-ECC un-buffered memory

Dual Channel memory architecture

** Refer to for the Memory QVL (Qualified Vendors Lists)

Display Support Integrated AMD Radeon™ R Series Graphics in the 7th Generation A-Series
APU Multi-VGA output support: HDMI, DVI-D, D-Sub port
- Supports HDMI 1.4b with max. resolution 4096 x 2160@24Hz / 2560 x 1600@60Hz
- Supports DVI-D with max. resolution up to 1920 x 1200 @60Hz
- Supports D-Sub with max. resolution up to 1920 x 1200 @60Hz
- Maximum shared memory of 2048 MB
Multi-GPU Support N/A
Expansion Slots AMD Ryzen™ Processors:
1 x PCI Express 3.0/2.0 x16 slot(max.@x16 mode)

AMD 7th Generation A-series/Athlon™ Processors:
1 x PCI Express 3.0/2.0 x16 slot(max.@x8 mode)

AMD B350 Chipset:
2 x PCI Express 2.0 x1 slots

Storage - 6 x Serial ATA 6.0 Gb/s connectors with RAID 0, RAID 1 and RAID 10 support

AMD Ryzen™ Processors
- 1 x M.2 socket 3 with M Key, Type 2242/2260/2280/22110(PCIE 3.0 x4 and SATA modes) storage devices support* C33
* When a SATA / PCIE mode M.2 device is installed, the M.2 Socket shares bandwidth with the SATA6G_5/6 ports

AMD 7th Generation A-series/Athlon™ Processors
- 1 x M.2 socket 3 with M Key, Type 2242/2260/2280/22110(PCIE 3.0 x2 and SATA modes)storage devices support*C33
* When a SATA / PCIE mode M.2 device is installed, the M.2 Socket shares bandwidth with the SATA6G_5/6 ports

LAN Realtek® 8111H Gigabit LAN Controller
W-Fi N/A
Bluetooth N/A
Audio Realtek® ALC 887-VD2 8-Channel High Definition Audio CODEC

* Use a chassis with HD audio module in the front panel to support an 8-channel audio output.

USB ASMedia USB 3.1 controllers:
- 2 x USB 3.1 ports (2 ports at back)

AMD Ryzen™/7th Generation A-series/Athlon™ Processors
- 4 x USB 3.0 ports (4 ports at back panel)

AMD B350 Chipset:
- 2 x USB 3.0/2.0 ports ( 2 ports at mid-board)
- 4 x USB 2.0/1.1 ports ( 4 ports at mid-board)

Back Panel I/O Ports 1 x PS/2 keyboard (purple)
1 x PS/2 mouse port (green)
1 x HDMI port
1 x DVI-D port
1 x D-Sub port
1 x LAN (RJ-45) port
2 x USB 3.1 ports
4 x USB 3.0/2.0 ports
3 x Audio jacks support 8-channel audio output
Internal I/O Connectors 1 x USB 3.0 connector supports additional 2 USB 3.0 ports
2 x USB 2.0/1.1 connectors support additional 4 USB 2.0/1.1 ports
6 x SATA 6.0Gb/s connectors
1 x M.2 Socket 3 for M Key, type 2242/2260/2280/22110 devices,(both SATA & PCIE mode)
1 x COM connector
1 x CPU Fan connector
1 x Fan RGB header
1 x Chassis Fan connector (Support DC & PWM mode)
1 x Front panel audio connector
1 x 24-pin EATX Power connector
1 x 8-pin ATX 12V Power connector
1 x 2-pin Clear CMOS
1 x System Panel connector
1 x Speaker connector
1 x S/PDIF out header
BIOS 128 Mb Flash ROM, UEFI AMI BIOS, PnP, DMI3.0, WfM2.0, SM BIOS 3.0, ACPI 6.1, Multi-language BIOS, ASUS EZ Flash 3, ASUS CrashFree BIOS 3, My Favorites, Last Modified log, F12 PrintScreen, ASUS DRAM SPD (Serial Presence Detect) memory information, F6 Qfan Control
Manageability WfM 2.0, DMI 3.0, WOL by PME, PXE
Operating System Support Windows® 10 (64-bit)
Form Factor uATX Form Factor
9.6" x 9.45" (24.4 cm x 24 cm)
Special Features Dependable Stability

- ASUS SafeSlot Core: Fortified PCIe Slot prevents damage
- ASUS LANGuard: Protects against LAN surges, lightning strikes and static-electricity discharges!
- ASUS Overvoltage Protection: World-class circuit-protecting power design
- ASUS Stainless-Steel Back I/O: 3X corrosion-resistance for greater durability!
- ASUS DIGI+ VRM: 6 Phase digital power design

Superb performance

- Most advanced options with fast response time

Safe motherboard mounting
- Component-free areas to minimize damage risk
- ASUS Q-Slot
- featuring friendly graphics user interface
- ASUS CrashFree BIOS 3
- ASUS EZ Flash 3

Package Contents

  • PRIME B350M-A/CSM Motherboard
  • User's manual ASUS
  • I/O shield
  • 2 x Serial ATA 6.0Gb/s cables
  • 1 x M.2 screw package )
  • Support Disc
    • Drivers
    • ASUS Utilities
    • ASUS Update
    • Anti-virus software (OEM version)