MotherboardsAsus
ASUS PRIME B840M-K
Quick Specs
ChipsetAMD B840 Chipset
SocketAM5
MemoryDDR5
Form FactormATX
M.2 Slots5
Model: 35757
About this motherboards
ASUS PRIME B840M-K unleashes AMD Ryzen™ 9000 power with AI optimizations, DDR5, PCIe 4.0, and advanced cooling for peak performance.
Technical Specifications24 specs
General
Model
PRIME B840M-K
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 Processors
- * Refer to
- https://www.asus.com/support/download-center/
- for CPU support list.
Chipset
AMD B840 Chipset
Memory
- 2 x DIMM slots, max. 128GB, DDR5
- Supports up to 8000+MT/s(OC) with Ryzen™ 9000 & 8000 & 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)
- * Max Manual Overclocking: Achievable with advanced BIOS configuration and potentially specialized hardware. Results may vary according to system components.
- * XMP/EXPO/AEMP Profiles: Rated memory module speeds require a BIOS performance profile setting. Results may vary according to system components and can be impacted when four DIMM slots are used.
- * 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
- 1 x HDMI
- ™
- port
- * Available only on processors featuring integrated graphics. Graphics specifications may vary between CPU types. Please refer to AMD CPU specifications.
- ** Supports 4K@60Hz as specified in HDMI 2.1.
Expansion Slots
- AMD Ryzen™ 9000 & 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
- 1 x PCIe 3.0 x16 slot (supports x4 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 2 x M.2 slots and 4 x SATA 6Gb/s ports
- AMD Ryzen™ 9000 & 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 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 2280 (supports PCIe 4.0 x4/x2 mode)
- AMD B840 Chipset
- 4 x SATA 6Gb/s ports
- * Specifications vary by CPU types.
Raid Support
- AMD RAIDXpert2 Technology
- Ryzen™ 9000 & 8000 & 7000 Series Processors: RAID 0/1/5/10
Ethernet
- 1 x Realtek
- ®
- 2.5Gb Ethernet
- ASUS LANGuard
Usb
- Rear USB (Total 6 ports)
- 4 x USB 5Gbps ports (4 x Type-A)
- 2 x USB 2.0 ports (2 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
- 4 x USB 5Gbps ports (4 x Type-A)
- 2 x USB 2.0 ports (2 x Type-A)
- 1 x HDMI
- ™
- port
- 1 x Realtek
- ®
- 2.5Gb Ethernet port
- 3 x Audio jacks
Internal I O
- Fan and Cooling Related
- 1 x 4-pin CPU Fan 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
- 2 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 RGB 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-Dashboard
- - Q-DIMM
- - Q-LED (CPU [red], DRAM [yellow], VGA [white], Boot Device [yellow green])
- - Q-Slot
- ASUS Thermal Solution
- - VRM heatsink design
- Aura Sync
- - Addressable RGB Gen 2 headers
Software Features
- ASUS Exclusive Software
- Armoury Crate
- - Aura Creator
- - Aura Sync
- - Fan Xpert 2+
- ASUS DriverHub
- - ASUS AI Advisor
- - ASUS CPU-Z
- - TurboV Core
- - Norton 360 Deluxe (60 Days Free Trial)
- - WinRAR (40 Days Free Trial)
- Adobe Creative Cloud (Free Trial)
- UEFI BIOS
- AI Cache Boost
- ASUS EZ DIY
- - ASUS CrashFree BIOS 3
- - ASUS EZ Flash 3
- - ASUS UEFI BIOS EZ Mode
- - ASUS MyHotkey
- * For more software features, please visit the asus support site or refer to
- www.asus.com/support
- for additional information.
- ** For detailed information on the supported models and restricted regions for this redemption offer, please refer to
- https://www.asus.com/content/asus-offers-adobe-creative-cloud/
- .
Bios
32MB (256Mb) Flash ROM, UEFI AMI BIOS
Manageability
WOL by PME, PXE
Accessories
- Cables
- 2 x SATA 6Gb/s cables
- Miscellaneous
- 1 x I/O shield
- 1 x Screw package for M.2 SSD
- Documentation
- 1 x Quick start guide
Operating System
Windows 11, Windows 10 64-bit
Form Factor
- micro-ATX Form Factor
- 9.6 inch x 8.7 inch ( 24.4 cm x 22.1 cm )
Physical Dimensions
Length Mm
243.8
Width Mm
221
Height Mm
619.8
