ASUS B840M-A Micro ATX Motherboard - AMD B840 DDR5 PCIe 4.0 WiFi 6E
- Micro ATX form factor •
- Supports AMD B840 socket AMD B840 •
- DDR5 memory support •
- Multiple M.2 slots (3x) •
- More features
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Description
ASUS B840M-A Micro ATX Motherboard - AMD B840 DDR5 PCIe 4.0 WiFi 6E brings AM5 compatibility and modern connectivity to compact builds, delivering a versatile foundation for Ryzen 7000/8000/9000 systems.
Designed around the AMD B840 chipset, the ASUS B840M-A supports Socket AM5 processors and offers compatibility with AMD Ryzen 7000, 8000 and 9000 Series CPUs, making it a future-ready choice for upgraders and new builds alike.
Memory support is robust for a micro ATX board: four DIMM slots accept DDR5-SDRAM in dual-channel configuration, supporting ECC and non-ECC unbuffered modules up to 192 GB total. This provides solid headroom for gaming, creative workloads and light server duties.
Storage options are abundant with three M.2 slots (two PCIe 4.0 x4 enabled and one PCIe 3.0) and four SATA III ports, allowing up to seven drives including both NVMe SSDs and traditional HDDs. RAID 0, 1, 5 and 10 are supported for data protection and performance tuning.
Expansion and connectivity are well covered: the board includes one PCIe 4.0 x16 slot and two PCIe 3.0 x16 slots, plentiful USB with USB 3.2 Gen2 Type-A, Gen1 Type-C and legacy USB 2.0, as well as a 2.5 Gb Ethernet port. Integrated Wi‑Fi 6E (802.11ax) and Bluetooth 5.3 provide fast wireless networking, and the package even includes an antenna.
Multimedia and I/O are practical for small systems: three display outputs (HDMI plus two DisplayPort), S/PDIF out and 7.1-channel audio deliver a complete media experience. Thermal and chassis support is good with multiple fan headers, CPU fan connector and included SATA cables and screws for quick installation.
Typical use cases include compact gaming rigs with high-speed NVMe storage, creator workstations leveraging large DDR5 memory pools, and home or small office servers benefiting from RAID support and ECC compatibility. Windows 10 x64 and Windows 11 are supported out of the box.
- Socket AM5 support for Ryzen 7000/8000/9000 Series
- DDR5, 4 DIMMs, up to 192 GB (ECC & Non-ECC)
- 3x M.2 (2x PCIe 4.0), Wi‑Fi 6E & 2.5 GbE
- RAID 0/1/5/10 and 7.1 audio
- Micro ATX compact form with multiple expansion slots
Features
Processor
- Processor manufacturer:AMD
- Processor socket:Socket AM5
- Compatible processor series:AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series
- Supported processor sockets:Socket AM5
Memory
- Supported memory types:DDR5-SDRAM
- Number of memory slots:4
- Memory slots type:DIMM
- Memory channels:Dual-channel
- ECC сompatibility:ECC & Non-ECC
- Maximum internal memory:192 GB
- Unbuffered memory:Yes
Storage controllers
- Supported storage drive types:HDD & SSD
- Supported storage drive interfaces:M.2, SATA III
- Number of HDDs supported:4
- Number of storage drives supported:7
- RAID support:Yes
- RAID levels:0, 1, 5, 10
Graphics
- Parallel processing technology support:Not supported
Internal I/O
- USB 2.0 connectors:2
- USB 3.2 Gen 1 (3.1 Gen 1) connectors:2
- Number of SATA III connectors:4
- S/PDIF out connector:Yes
- Front panel audio connector:Yes
- Front panel connector:Yes
- ATX Power connector (24-pin):Yes
- CPU fan connector:Yes
- Number of chassis fan connectors:3
- Number of COM connectors:1
- TPM connector:Yes
- 12V power connector:Yes
Rear panel I/O ports
- USB 2.0 ports quantity:4
- USB 3.2 Gen 1 (3.1 Gen 1) Type-C ports quantity:1
- USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity:2
- Ethernet LAN (RJ-45) ports:1
- HDMI ports quantity:1
- DisplayPorts quantity:2
- WiFi-AP antenna jack:1
Network
- Ethernet LAN:Yes
- Ethernet interface type:2.5 Gigabit Ethernet
- Wi-Fi:Yes
- Top Wi-Fi standard:Wi-Fi 6E (802.11ax)
- Wi-Fi standards:Wi-Fi 6E (802.11ax)
- Bluetooth:Yes
- Bluetooth version:5.3
Features
- Motherboard chipset:AMD B840
- Audio output channels:7.1 channels
- Component for:PC
- Motherboard form factor:micro ATX
- Motherboard chipset family:AMD
- Windows operating systems supported:Windows 10 x64, Windows 11
Expansion slots
- PCI Express x16 (Gen 3.x) slots:2
- PCI Express x16 (Gen 4.x) slots:1
- Number of M.2 (M) slots:3
- 1st M.2 largest key size:2280
- 1st M.2 highest PCI Express generation:4.0
- 2nd M.2 largest key size:2280
- 2nd M.2 highest PCI Express generation:4.0
- 3rd M.2 largest key size:2280
- 3rd M.2 highest PCI Express generation:3.0
BIOS
- BIOS type:UEFI AMI
- BIOS memory size:256 Mbit
Packaging data
- Package width:275 mm
- Package depth:275 mm
- Package height:67.5 mm
- Package weight:1.52 kg
Weight & dimensions
- Width:244 mm
- Depth:244 mm
Packaging content
- Cables included:SATA
- Antenna included:Yes
- Screws included:Yes
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