Prime B350M-A/CSM Desktop Motherboard

AMD AM4 uATX motherboard with LED lighting, DDR4, 32Gb/s M.2, HDMI, SATA 6Gb/s, USB 3.1

  • 5X Protection III: Multiple hardware safeguards for all-round protection
  • LED illumination: Lighting control for both PCIe slot and audio trace paths
  • Native M.2: Lightning-fast storage speeds
  • Onboard USB 3.1: Latest connectivity for ultrafast 10Gbps transfers
  • One-stop controls: Media-acclaimed UEFI BIOS with EZ Flash 3

PRIME

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 enthusiast controls easily accessible — maximizing performance, stability and compatibility for the very best DIY PC experiences. Simply stated: it's time for Prime.

Reliable Stability and Compatibility

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.

5X Protection III

Hardware safeguards to ensure long-term durability.

350+ DDR4 Compatibility

Industry-leading DDR4 memory compatibility for best flexibility and reassurance.

1000+ 
Compatible Devices

Compatibility with a range of CPUs, memory modules, graphics cards and more.

8000+ Validation Hours

Extensive testing with latest components for enhanced reliability, compatibility and safety.

PRIME B350 series motherboards are engineered with industry-leading 5X Protection III, employing the finest components, excellent circuit design, and exacting standards to guarantee the quality and long-term durability of your motherboard. That means exceptional protection and stability for your build — thanks to decades of engineering experience from the world's leading motherboard brand.

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.

ASUS Prime motherboards have strengthened solder points around both the PCIe and DIMM pins.

LANGuard

Pumped-up throughput. 2.5x higher surge tolerance.

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.

Manufacturer Part Number
PRIME B350M-A/CSM
EAN/UPC
0889349657270,889349657270
Full Product Specifications

Note:

  • The full product specifications below are from the manufacturer and may contain information related to other package quantities that will not apply to the product that you are reviewing. Please confirm the actual content and/or package quantity from the main product specifications page.
  • These specifications may represent the entire product series/model/line to which this product belongs with specific configuration differences between the individual products stated.
  • These specifications may have been copied from the same product in other region/country in which case there might be minor differences in region-specific data such as Input Voltage, Terms of Warranty etc.

CPU

  • AMD AM4 Socket for AMD Ryzen™/7th Generation A-series/Athlon™ Processors 
  • Supports CPU up to 8 cores
  • * Refer to www.asus.com for CPU support list
Chipset
  • AMD B350
Memory
  • AMD Ryzen™ Processors
  • 4 x DIMM, Max. 64GB, DDR4 3200(O.C.)/2933(O.C.)/2666/2400/2133 MHz ECC and non-ECC, Un-buffered Memory *1
  • AMD 7th Generation A-series/Athlon™ Processors
  • 4 x DIMM, Max. 64GB, DDR4 2400/2133 MHz Non-ECC, Un-buffered Memory 
  • Dual Channel Memory Architecture 
  • ** Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists).
  • * Hyper DIMM support is subject to the physical characteristics of individual CPUs. 
Graphic
  • Integrated AMD Radeon™ R Series Graphics in the 7th Generation A-Series APU 
  • Multi-VGA output support : HDMI/DVI/RGB ports 
  • - Supports HDMI 1.4b with max. resolution 4096 x 2160 @ 24 Hz / 2560 x 1600 @ 60 Hz
  • - Supports DVI-D with max. resolution 1920 x 1200 @ 60 Hz
  • - Supports RGB with max. resolution 1920 x 1200 @ 60 Hz
  • Maximum shared memory of 2048 MB
Expansion Slots
  • AMD Ryzen™ Processors
  • 1 x PCIe 3.0/2.0 x16 (x16 mode) 
  • AMD 7th Generation A-series/Athlon™ Processors
  • 1 x PCIe 3.0/2.0 x16 (x8 mode) 
  • AMD B350 chipset
  • 2 x PCIe 2.0 x1
Storage
  • AMD B350 chipset : 
  • 4 x SATA 6Gb/s port(s), gray, 
  • Support Raid 0, 1, 10
  • AMD Ryzen™/7th Generation A-series/Athlon™ Processors : 
  • 2 x SATA 6Gb/s port(s), gray, 
  • AMD Ryzen™ Processors : 
  • 1 x M.2 Socket 3, with M key, type 2242/2260/2280/22110 storage devices support (SATA & PCIE 3.0 x 4 mode)*2
  • AMD 7th Generation A-series/Athlon™ Processors : 
  • 1 x M.2 Socket 3, with M key, type 2242/2260/2280/22110 storage devices support (SATA & PCIE 3.0 x 2 mode)*3
LAN
  • Realtek® RTL8111H, 1 x Gigabit LAN Controller(s)
Audio
  • Realtek® ALC887 8-Channel High Definition Audio CODEC
USB Ports
  • ASMedia® USB 3.1 controller :
  • 2 x USB 3.1 port(s) (2 at back panel, teal blue)
  • AMD Ryzen™/7th Generation A-series/Athlon™ Processors : 
  • 4 x USB 3.0 port(s) (4 at back panel, blue)
  • AMD B350 chipset : 
  • 2 x USB 3.0 port(s) (2 at mid-board)
  • AMD B350 chipset : 
  • 4 x USB 2.0 port(s) (4 at mid-board)
Special Features
  • ASUS 5X Protection III :
  • - 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
  • ASUS Exclusive Features :
  • - AI Suite 3
  • - Ai Charger 
  • - Turbo LAN
  • - PC Cleaner
  • ASUS Quiet Thermal Solution :
  • - Stylish Fanless Design Heat-sink solution
  • - ASUS Fan Xpert 
  • ASUS EZ DIY :
  • - ASUS CrashFree BIOS 3 
  • - ASUS EZ Flash 3 
  • - ASUS UEFI BIOS EZ Mode
  • - Multi-language BIOS
  • ASUS Q-Design :
  • - ASUS Q-Slot
  • - ASUS Q-DIMM
Operating System Support
  • Windows® 10 , 64bit
Back I/O Ports
  • 1 x PS/2 keyboard (purple)
  • 1 x PS/2 mouse (green)
  • 1 x DVI-D
  • 1 x D-Sub
  • 1 x HDMI
  • 1 x LAN (RJ45) port(s)
  • 2 x USB 3.1 (teal blue)
  • 4 x USB 3.0 (blue) 
  • 3 x Audio jack(s)
Internal I/O Ports
  • 1 x Fan RGB header
  • 1 x USB 3.0 connector(s) support(s) additional 2 USB 3.0 port(s) (19-pin)
  • 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 & PCIE mode)
  • 1 x COM port(s) connector(s)
  • 6 x SATA 6Gb/s connector(s)
  • 1 x CPU Fan connector(s) (1 x 4 -pin)
  • 1 x Chassis Fan connector(s) (1 x 4 -pin)
  • 1 x S/PDIF out header(s)
  • 1 x 24-pin EATX Power connector(s)
  • 1 x 8-pin ATX 12V Power connector(s)
  • 1 x Front panel audio connector(s) (AAFP)
  • 1 x System panel(s) 
  • 1 x Clear CMOS jumper(s)
  • 1 x Speaker connector
Accessories
  • User's manual
  • I/O Shield
  • 2 x SATA 6Gb/s cable(s)
  • 1 x M.2 Screw Package
  • 1 x Supporting DVD
BIOS
  • 128 Mb Flash ROM, UEFI AMI BIOS, PnP,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
Operating System
  • Windows® 10 64-bit
Form Factor
  • Micro ATX Form Factor 
  • 9.6 inch x 9.45 inch ( 24.4 cm x 24 cm )
Note

1*Due to the limitation of AMD Ryzen™ processors, memory frequencies higher than DDR4 2666 MHz are supported only when using one DIMM.
2*When a SATA / PCIE mode M.2 device is installed, the M.2 Socket shares bandwidth with the SATA6G_5/6 ports.
3*When a SATA mode M.2 device is installed, the M.2 Socket shares bandwidth with the SATA6G_5/6 ports.