Asus PRIME B840M-A WIFI-CSM Gaming Desktop Motherboard - AMD B840 Chipset Socket AM5 Micro ATX Ryzen 7, Ryzen 9 Processor Supported 192 GB DDR5 SDRAM Maximum RAM DIMM, UDIMM 4 x Memory Slots Gigabit Ethernet 2.5Gigabit Ethernet IEEE 802.

• AI-powered:
  Yes
  

• Chipset Manufacturer:
  AMD
  
• Chipset Model:
  B840
  
• Total Processor Supported:
  1
  
• Processor Socket:
  Socket AM5
  
• Processor Supported:
  Ryzen 7, Ryzen 9
  

• Number of Memory Slots:
  4
  
• Memory Form Factor:
  DIMM, UDIMM
  
• Maximum Memory Supported:
  192 GB
  
• Memory Speed Supported:
  7600 MHz
  
• Memory Technology:
  DDR5 SDRAM
  
• Error Checking:
  ECC
  

• Controller Type:
  Serial ATA/600
  
• RAID Supported:
  Yes
  
• RAID Levels:
  0, 1, 5, 10
  

• Onboard Video:
  CPU Dependent Video
  

• Audio Channels:
  7.1
  

• Bluetooth:
  Yes
  
• Bluetooth Standard:
  Bluetooth 5.3
  
• Gigabit Ethernet:
  Yes
  
• 2.5Gigabit Ethernet:
  Yes
  
• Wireless LAN:
  Yes
  
• Wireless LAN Standard:
  IEEE 802.11ax
  

• Total Number of Expansion Slots:
  4
  
• Total Number of PCI Express Slots:
  4
  
• Number of PCI Express x16 Slots:
  4
  
• PCI Express Standard:
  PCI Express 4.0, PCI Express 3.0
  

• Total Number of USB Ports:
  7
  
• S/PDIF:
  Yes
  
• HDMI:
  Yes
  
• DisplayPort:
  Yes
  
• Number of Network (RJ-45) Ports:
  1
  

• Number of SATA Interfaces:
  4
  
• Number of M.2 Interfaces:
  3
  
• Total Number of Onboard USB Ports:
  7
  
• Number of Onboard USB 2.0 Ports:
  4
  

• Form Factor:
  Micro ATX
  
• Width:
  9.6"
  
• Depth:
  9.6"
  

• Environmental Compliance:
  Restriction of Hazardous Substances (RoHS), China Restriction of Hazardous Substances (China RoHS), Taiwan Restriction of Hazardous Substances (Taiwan RoHS), Waste Electrical and Electronic Equipment Directive (WEEE)
  
• Country of Origin:
  China
  

Model
PRIME B840M-A WIFI-CSM
News and Updates
Socket AM5
Please visit our GLOBAL website to check and download the latest updates.
CPU
AMD Socket AM5 for AMD Ryzen 9000 and 8000 and 7000 Series Desktop Processors
Refer to https://www.asus.com/support/download-center/ for CPU support list.
Chipset
AMD B840 Chipset
Memory
4 x DIMM slots, max. 256GB, DDR5
Supports up to 7600+MT/s (OC) with Ryzen 9000 and 8000 and 7000 Series Processors, ECC and Non-ECC, Un-buffered DIMM
Dual channel memory architecture
Supports AMD Extended Profiles for Overclocking (EXPO)
ASUS Enhanced Memory Profile (AEMP)
Supported memory types, data rate (speed), and number of DRAM modules vary depending on the CPU and memory configuration, for more information please refer to CPU/Memory Support list under the Support tab of product information site or visit https://www.asus.com/support/download-center/. Adjustments will be made based on the specifications of mass-produced memory products available on the market.
Non-ECC, un-buffered DDR5 memory supports On-Die ECC function.
Graphics
2 x DisplayPort
1 x HDMI port
Graphics specifications may vary between CPU types. Please refer to AMD CPU specifications.
Supports max. 8K at 30Hz as specified in DisplayPort 1.4.
Supports 4K at 60Hz as specified in HDMI 2.1.
Expansion Slots
AMD Ryzen 9000 and 7000 Series Desktop Processors
1 x PCIe 4.0 x16 slot (supports x16 mode)
AMD Ryzen 8000 Series Desktop Processors
1 x PCIe 4.0 x16 slot (supports x8/x4 mode)
AMD B840 Chipset
2 x PCIe 3.0 x16 slots (support x1 mode)
Please check the PCIe bifurcation table on the support site (https://www.asus.com/support/FAQ/1037507/).
Specifications vary by CPU types.
- To ensure compatibility of the device installed, please refer to https://www.asus.com/support/download-center/ for the list of supported peripherals.
Storage
Total supports 3 x M.2 slots and 4 x SATA 6Gb/s ports
AMD Ryzen 9000 and 7000 Series Desktop Processors
M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode)
M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
AMD Ryzen 8000 Series Desktop Processors
M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode)
M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4/x2 mode)
AMD B840 Chipset
M.2_3 slot (Key M), type 2280 (supports PCIe 3.0 x4 mode)
4 x SATA 6Gb/s ports
Specifications vary by CPU types.
AMD RAIDXpert2 Technology
Ryzen 9000 Series Processors: RAID 0/1/5/10
Ryzen 8000 Series Processors: RAID 0/1
Ryzen 7000 Series Processors: RAID 0/1/10
Ethernet
1 x Realtek 2.5Gb Ethernet
ASUS LANGuard
Wireless and Bluetooth
Wi-Fi 6E
2x2 Wi-Fi 6E (802.11ax)
Supports 2.4/5/6GHz frequency band
Bluetooth v5.3
WiFi 6E 6GHz regulatory may vary between countries, supported only in Windows 11 or later.
The Bluetooth version may vary, please refer to the Wi-Fi module manufacturers website for the latest specifications.
USB
Rear USB (Total 7 ports)
2 x USB 10Gbps ports (2 x Type-A)
1 x USB 5Gbps port (1 x USB Type-C)
4 x USB 2.0 ports (4 x Type-A)
Front USB (Total 7 ports)
1 x USB 5Gbps connector (supports USB Type-C)
1 x USB 5Gbps header supports 2 additional USB 5Gbps ports
2 x USB 2.0 headers support 4 additional USB 2.0 ports
USB Type-C power delivery output: max. 5V/3A
Audio
Realtek 7.1 Surround Sound High Definition Audio CODEC
- Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking
- Supports up to 24-Bit/192 kHz playback
Audio Features
- Audio Shielding
- Premium audio capacitors
- Dedicated audio PCB layers
A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output.
Back Panel I/O Ports
2 x USB 10Gbps ports (2 x Type-A)
1 x USB 5Gbps port (1 x USB Type-C)
4 x USB 2.0 ports (4 x Type-A)
2 x DisplayPort
1 x HDMI port
1 x Wi-Fi module
1 x Realtek 2.5Gb Ethernet port
3 x Audio jacks
1 x BIOS FlashBack button
Internal I/O Connectors
Fan and Cooling Related
1 x 4-pin CPU Fan header
1 x 4-pin CPU OPT Fan header
1 x 4-pin AIO Pump header
3 x 4-pin Chassis Fan headers
Power Related
1 x 24-pin Main Power connector
1 x 8-pin +12V CPU Power connector
Storage Related
3 x M.2 slots (Key M)
4 x SATA 6Gb/s ports
USB
1 x USB 5Gbps connector (supports USB Type-C )
1 x USB 5Gbps header supports 2 additional USB 5Gbps ports
2 x USB 2.0 headers support 4 additional USB 2.0 ports
Miscellaneous
3 x Addressable Gen 2 headers
1 x Clear CMOS header
1 x COM Port header
1 x Front Panel Audio header (F_AUDIO)
1 x S/PDIF Out header
1 x SPI TPM header (14-1 pin)
1 x 10-1 pin Front Panel System header
Special Features
ASUS 5X PROTECTION III
- DIGI+ VRM
- LANGuard
- Overvoltage protection
- SafeSlot Core+
- Stainless-steel back I/O
ASUS Q-Design
- Q-Antenna
- Q-Dashboard
- Q-DIMM
- Q-LED Core
- Q-Slot
ASUS Thermal Solution
- M.2 heatsink
- VRM heatsink design
ASUS EZ DIY
- BIOS FlashBack button
- BIOS FlashBack LED
- Pre-mounted I/O shield
Aura Sync
- Addressable Gen 2 headers
Software Features
ASUS Exclusive Software
Armoury Crate
- Aura Creator
- Aura Sync
- Fan Xpert 2+
- Power Saving
ASUS DriverHub
ASUS GlideX
TurboV Core
ASUS CPU-Z
Norton 360 Deluxe (60 Days Free Trial)
WinRAR (40 Days Free Trial)
UEFI BIOS
ASUS EZ DIY
- ASUS CrashFree BIOS 3
- ASUS EZ Flash 3
- ASUS UEFI BIOS EZ Mode
- ASUS MyHotkey
Remote Management Features
IT Management software supported
- ASUS Control Center Express (ACCE)
BIOS
256 Mb Flash ROM, UEFI AMI BIOS
Manageability
WOL by PME, PXE
Accessories
Cables
2 x SATA 6Gb/s cables
Miscellaneous
1 x ASUS WiFi Q-Antenna
1 x M.2 rubber package
2 x Screw packages for M.2 SSD
Documentation
1 x ACC Express Activation Key Card
1 x Quick start guide