AMD Core PRIME B840M-K AMD B840 Socket AM5 micro ATX
- Depth
- 221 mm
- Wi-Fi
- N
- Width
- 244 mm
- BIOS type
- UEFI AMI
- RAID levels
- 0,1,5,10
- Ethernet LAN
- Y
- RAID support
- Y
- Intended use
- PC
- TPM connector
- Y
Overview
B840M-K
ASUS Prime series motherboards are expertly engineered to unleash the full potential of AMD Ryzen™ 9000 series processors. The PRIME B840M-K 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.
Compatibility
- Pairs with CPUs using the Socket AM5 socket.
- Physical size is Micro ATX — check your case supports this form factor.
Compatibility data is automatically generated. Always verify critical specs before purchase.
Technical Specifications
Showing 28 key specifications of 67
All values come from this product’s catalog record.- Depth
- 221 mm
- Wi-Fi
- No
- Width
- 244 mm
- BIOS type
- UEFI AMI
- RAID levels
- 0,1,5,10
- Ethernet LAN
- Yes
- RAID support
- Yes
- Intended use
- PC
- TPM connector
- Yes
- Colour
- Black
- Included cables
- SATA
- Memory channels
- Dual-channel
- Screws included
- Yes
- BIOS memory size
- 256 MB
- Socket
- Socket AM5
- CPU fan connector
- Yes
- Memory slots type
- DIMM
- Unbuffered memory
- Yes
- ECC сompatibility
- ECC & non-ECC
- RGB LED pin header
- Yes
- Top Wi-Fi standard
- Not available
- USB 2.0 connectors
- 2
- 12V power connector
- Yes
- HDMI ports
- 1
- Chipset
- AMD B840
- DVI-D ports quantity
- 0
- S/PDIF out connector
- Yes
- Audio channels
- 7.1
Show all 67 specifications
- Front panel connector
- Yes
- Memory slots
- 2
- CPU brand
- AMD
- Supported memory types
- DDR5-SDRAM
- USB 2.0 ports
- 2
- Ethernet interface type
- 2.5 Gigabit Ethernet
- Max memory
- 128 GB
- Form factor
- Micro ATX
- Number of M.2 (M) slots
- 2
- Number of COM connectors
- 1
- Number of HDDs supported
- 4
- Ethernet ports
- 1
- Motherboard chipset family
- AMD
- VGA ports
- 0
- Compatible processor series
- AMD Ryzen 7000 Series,AMD Ryzen 8000 Series,AMD Ryzen 9000 Series
- EPS power connector (8-pin)
- Yes
- Front panel audio connector
- Yes
- Supported CPU sockets
- Socket AM5
- ATX Power connector (24-pin)
- Yes
- Number of RGB LED pin headers
- 3
- Number of SATA III connectors
- 4
- Supported storage drive types
- HDD & SSD
- PCI Express x16 (Gen 3.x) slots
- 1
- PCI Express x16 (Gen 4.x) slots
- 1
- Number of chassis fan connectors
- 3
- Number of storage drives supported
- 6
- Supported storage drive interfaces
- M.2,SATA III
- Windows versions supported
- Windows 10 x64,Windows 11
- USB 3.2 Gen 1 (3.1 Gen 1) connectors
- 2
- USB 3.2 Gen 2 (3.1 Gen 2) connectors
- 0
- Parallel processing technology support
- Not supported
- USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity
- 4
- USB 3.2 Gen 1 (3.1 Gen 1) Type-C ports quantity
- 0
- USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity
- 0
- USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity
- 0
- Package depth
- 263 mm
- Package width
- 270 mm
- Package height
- 51.5 mm
- Package weight
- 1022 g
Market Value History
Price history table
| Date | Price |
|---|---|
| 2026-02-23 | $379.31 |
| 2026-03-08 | $272.91 |
| 2026-04-03 | $267.68 |
| 2026-04-09 | $264.36 |
| 2026-04-13 | $186.56 |
| 2026-04-20 | $175.91 |
| 2026-05-14 | $252.49 |
| 2026-05-18 | $256.49 |
| 2026-06-17 | $184.81 |
| 2026-07-02 | $159.32 |
| 2026-07-06 | $257.68 |
| 2026-07-17 | $210.12 |
| 2026-07-22 | $209.16 |
| 2026-08-06 | $174.50 |
| 2026-08-10 | $175.93 |
| 2026-08-17 | $184.21 |
Customer Reviews & Feedback
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As verified customer reviews are published on Amazon, rating scores and star breakdowns are updated automatically.
Sources
Product lifecycle
Catalog: on-marketThe current catalog record marks this product as on-market; this is not independent manufacturer confirmation.
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