ASUS Prime series motherboards are expertly engineered to unleash the full potential of AMD Ryzen 9000 series processors. The PRIME B840-PLUS WIFI motherboard provides users and PC DIY builders with a range of performance optimizations via intuitive software and firmware features. It's designed to be Advanced AI PC-ready, offering the power and connectivity needed for demanding AI applications.
Tech Spec
Model
- PRIME B840-PLUS WIFI
News & Updates
- Please visit our GLOBAL website to check and download the latest updates.
CPU
- AMD Socket AM5 for AMD Ryzen 9000 & 8000 & 7000 Series Desktop Processorsx
x 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 & 8000 & 7000 Series Processors, ECC and Non-ECC Un-buffered DIMMx
- Dual channel memory architecture
- Supports AMD Extended Profiles for Overclocking (EXPO )
ASUS Enhanced Memory Profile (AEMP)
x 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.
x Non-ECC, un-buffered DDR5 memory supports On-Die ECC function.
Graphics
- 1 x DisplayPortxx
- 1 x HDMI portxxx
x Graphics specifications may vary between CPU types. Please refer to AMD CPU specifications.
xx Supports max. 8K@30Hz as specified in DisplayPort 1.4.
xxx Supports 4K@60Hz as specified in HDMI 2.1.
Expansion Slots
- AMD Ryzen 9000 & 7000 Series Desktop Processorsx
- 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)xx
AMD B840 Chipset
- 1 x PCIe 3.0 x16 slot (support x4 mode)xxx
- 2 x PCIe 3.0 x16 slots (support x1 mode)xxx
- 1 x PCIe 3.0 x1 slotxxx
x Please check the PCIe bifurcation table on the support site (https://www.asus.com/support/FAQ/1037507/).
xx Specifications vary by CPU types.
xxx The PCIEX16(G3)1/3 and PCIEX1(G3) share bandwidth with PCIEX16(G3)2. The PCIEX16(G3)2 will run x1 mode when any of the PCIEX16(G3)1/3 and PCIEX1(G3) slots is occupied.
- To ensure compatibility of the device installed, please refer to https://www.asus.com/support/download-center/ for the list of supported peripherals.
Storage
AMD B840 Chipset
- M.2_3 slot (Key M), type 2242/2260/2280 (supports PCIe 3.0 x4 mode
- 4 x SATA 6Gb/s ports
x 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 & Bluetooth
- "Wi-Fi 6E
- 2x2 Wi-Fi 6E (802.11ax)
- Supports 2.4/5/6GHz frequency bandx
- Bluetooth v5.3xx
x WiFi 6E 6GHz regulatory may vary between countries, supported only in Windows 11 or later.
xx The Bluetooth version may vary, please refer to the Wi-Fi module manufacturer's website for the latest specifications."
USB
- Rear USB (Total 8 ports)
- 2 x USB 10Gbps port(s) (1 x Type-A + 1 x USB Type-C )
- 2 x USB 5Gbps ports (2 x Type-A)
- 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
x USB Type-C power delivery output: max. 5V/3A
Audio
- Realtek 7.1 Surround Sound High Definition Audio CODECx
- 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
x 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
- 1 x USB 10Gbps port (1 x USB Type-C )
- 1 x USB 10Gbps port (1 x Type-A)
- 2 x USB 5Gbps ports (2 x Type-A)
- 4 x USB 2.0 ports (4 x Type-A)
- 1 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
- 4 x 4-pin Chassis Fan header
Power Related
- 1 x 24-pin Main Power connector
- 1 x 8-pin +12V CPU Power connectors
- 1 x 4-pin +12V CPU Power connectors
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 Chassis Intrusion 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 System Panel header
- 1 x Thunderbolt (USB4 ) 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
- Flexible M.2 heatsink
- VRM heatsink design
ASUS EZ DIY
- BIOS FlashBack button
- BIOS FlashBack LED
- Pre-mounted I/O shield
- SafeSlot core+
Aura Sync
- Addressable Gen 2 headers
Software Features
ASUS Exclusive Software
Armoury Crate
- Aura Creator
- Aura Sync
- Fan Xpert 2+
- Power Saving
ASUS Driver Hub
ASUS GlideX
TurboV Core
ASUS CPU-Z
Adobe Creative Cloud (Free Trial)
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
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 packages
- 3 x Screw packages for M.2 SSD
Documentation
1 x Quick start guide
Operating System
- Windows 11, Windows 10 64-bit
Form Factor
ATX Form Factor
- 12 inch x 9.6 inch ( 30.5 cm x 24.4 cm )
What's in the box
Cables
- 2 x SATA 6Gb/s cables
Miscellaneous
- 1 x ASUS WiFi Q-Antenna
- 1 x M.2 rubber packages
- 3 x Screw packages for M.2 SSD
Documentation
1 x Quick start guide
