ASUS PRIME B840M-A WIFI micro ATX motherboard
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About This Item
- AMD B840 chipset with Socket AM5 for Ryzen 7000/8000/9000 series
- micro ATX form factor with 7.1 channel audio and dual-channel DDR5 support
- Three M.2 slots (two PCIe 4.0, one PCIe 3.0) plus 4 SATA III ports
- Wi-Fi 6E, 2.5Gb Ethernet, Bluetooth 5.3 and USB 3.2 Gen 2 Type-A ports
- Supports up to 192GB RAM, RAID 0/1/5/10, and ECC/non-ECC memory
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ASUS PRIME B840M-A WIFI | Micro ATX AMD AM5 Motherboard
The ASUS PRIME B840M-A WIFI AMD B840 Socket AM5 micro ATX motherboard delivers a balanced blend of performance, connectivity, and future-ready features for DIY builders and PC enthusiasts working with AMD Ryzen 7000, 8000, and 9000 series processors. Designed for compact builds without compromising expandability, this board supports DDR5 memory, multiple M.2 slots, and integrated Wi-Fi 6E for versatile, high-speed computing.
Key Specifications
| Metric | Spec |
|---|---|
| Socket | AM5 |
| Memory Support | DDR5, up to 192 GB |
| M.2 Slots | 3 (2x PCIe 4.0, 1x PCIe 3.0) |
| Wi-Fi | Wi-Fi 6E (802.11ax) |
| Ethernet | 2.5 Gigabit LAN |
| Form Factor | micro ATX |
Built for AMD Ryzen 7000/8000/9000 Series
Engineered to unlock the full potential of AMD’s latest Ryzen processors, the PRIME B840M-A WIFI uses the AM5 socket and AMD B840 chipset to deliver stable power delivery and efficient thermal management. Whether you’re gaming, content creating, or running AI workloads, this motherboard provides the backbone for high-performance builds.
Enhanced Connectivity for Modern Builds
With integrated Wi-Fi 6E and Bluetooth 5.3, this board ensures fast, reliable wireless connections. The 2.5 Gigabit Ethernet port offers ultra-low latency for online gaming and large file transfers. Multiple USB ports, including USB 3.2 Gen 2 Type-A and Type-C, provide flexible connectivity for peripherals and external storage.
Expandable Storage Options
Featuring three M.2 slots (two PCIe 4.0, one PCIe 3.0) and four SATA III ports, the B840M-A WIFI supports a wide range of storage configurations. RAID 0, 1, 5, and 10 are supported for data redundancy or performance tuning. This makes it ideal for users needing fast boot drives, mass storage, or backup solutions.
Compact Micro ATX Design
The micro ATX form factor (244 x 244 mm) makes this motherboard perfect for space-conscious builds without sacrificing features. It fits standard ATX cases and offers a clean layout for easier cable management and component installation.
Box contents
- ASUS PRIME B840M-A WIFI motherboard
- SATA cables (quantity not specified)
- Screws (quantity not specified)
- Wi-Fi antennas (quantity not specified)
Check before you buy
- Confirm your AMD Ryzen processor is compatible with AM5 socket and supports DDR5 memory.
- Verify your case supports micro ATX motherboards (244 x 244 mm).
- Check if your GPU and other PCIe devices will fit alongside the three M.2 slots.
- Confirm your power supply has a 24-pin ATX connector and adequate PCIe power connectors.
Frequently Asked Questions
Q: Does this motherboard support DDR4 memory?
A: No, the ASUS PRIME B840M-A WIFI only supports DDR5-SDRAM memory.
Q: How many M.2 SSDs can I install?
A: You can install up to three M.2 SSDs: two PCIe 4.0 and one PCIe 3.0.
Q: Is Wi-Fi included or do I need a separate card?
A: Wi-Fi 6E is integrated, so no separate card is required.
Q: Can I use this motherboard for gaming?
A: Yes, it’s well-suited for gaming with support for high-speed memory, fast storage, and modern connectivity.
Q: Does it support Windows 11?
A: Yes, it supports both Windows 10 x64 and Windows 11.
The Consultant’s verdict & warranty
The ASUS PRIME B840M-A WIFI is a versatile micro ATX motherboard for users building compact yet powerful AMD AM5 systems. With Wi-Fi 6E, multiple M.2 slots, and DDR5 support, it’s ideal for gamers, creators, and professionals seeking reliable performance in a smaller footprint. Covered by the standard Manufacturer Warranty.
| Internal I/O | |
|---|---|
| Number of M.2 (M) slots | 3 |
| Front panel connector | Yes |
| 12V power connector | Yes |
| Supported storage drive interfaces | M.2, SATA III |
| USB 2.0 connectors | 2 |
| USB 3.2 Gen 1 (3.1 Gen 1) connectors | 2 |
| TPM connector | Yes |
| S/PDIF out connector | Yes |
| Number of SATA III connectors | 4 |
| Number of COM connectors | 1 |
| Number of chassis fan connectors | 3 |
| Front panel audio connector | Yes |
| CPU fan connector | Yes |
| ATX Power connector (24-pin) | Yes |
| Technical details | |
| Motherboard chipset family | AMD |
| Motherboard chipset | AMD B840 |
| Supported processor sockets | Socket AM5 |
| Parallel processing technology support | Not supported |
| Motherboard form factor | micro ATX |
| Component for | PC |
| Audio | |
| Audio output channels | 7.1 channels |
| Performance | |
| Number of HDDs supported | 4 |
| Supported storage drive types | HDD & SSD |
| Windows operating systems supported | Windows 10 x64, Windows 11 |
| Motherboard chipset family | AMD |
| Motherboard chipset | AMD B840 |
| RAID levels | 0, 1, 5, 10 |
| Supported processor sockets | Socket AM5 |
| Audio output channels | 7.1 channels |
| Motherboard form factor | micro ATX |
| Component for | PC |
| Processor | |
| Processor manufacturer | AMD |
| Compatible processor series | AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series |
| Supported processor sockets | Socket AM5 |
| Processor socket | Socket AM5 |
| Memory | |
| Number of memory slots | 4 |
| Memory slots type | DIMM |
| Supported memory types | DDR5-SDRAM |
| Memory channels | Dual-channel |
| Maximum internal memory | 192 GB |
| Unbuffered memory | Yes |
| ECC сompatibility | ECC & Non-ECC |
| Storage controllers | |
| Number of HDDs supported | 4 |
| Supported storage drive types | HDD & SSD |
| Supported storage drive interfaces | M.2, SATA III |
| RAID levels | 0, 1, 5, 10 |
| Number of storage drives supported | 7 |
| RAID support | Yes |
| Graphics | |
| Parallel processing technology support | Not supported |
| Rear panel I/O ports | |
| 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 |
| USB 2.0 ports quantity | 4 |
| WiFi-AP antenna jack | 1 |
| HDMI ports quantity | 1 |
| Ethernet LAN (RJ-45) ports | 1 |
| DisplayPorts quantity | 2 |
| Network | |
| Ethernet LAN | Yes |
| Wi-Fi | Yes |
| Wi-Fi standards | Wi-Fi 6E (802.11ax) |
| Ethernet interface type | 2.5 Gigabit Ethernet |
| Bluetooth | Yes |
| Bluetooth version | 5.3 |
| Top Wi-Fi standard | Wi-Fi 6E (802.11ax) |
| Features | |
| Windows operating systems supported | Windows 10 x64, Windows 11 |
| Motherboard chipset family | AMD |
| Motherboard chipset | AMD B840 |
| Supported processor sockets | Socket AM5 |
| Audio output channels | 7.1 channels |
| Motherboard form factor | micro ATX |
| Component for | PC |
| Expansion slots | |
| Number of M.2 (M) slots | 3 |
| PCI Express x16 (Gen 3.x) slots | 2 |
| PCI Express x16 (Gen 4.x) slots | 1 |
| 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 |
| Software | |
| Windows operating systems supported | Windows 10 x64, Windows 11 |
| Weight & dimensions | |
| Package width | 275 mm |
| Package depth | 275 mm |
| Package height | 67.5 mm |
| Package weight | 1.52 kg |
| Width | 244 mm |
| Depth | 244 mm |
| Packaging content | |
| Cables included | SATA |
| Screws included | Yes |
| Antenna included | Yes |
| Other features | |
| Package width | 275 mm |
| Package depth | 275 mm |
| Package height | 67.5 mm |
| Package weight | 1.52 kg |
| Identifiers | |
| Distributor SKUs | MBD-90MB1J20-M0EAY0, 11508506, 126173, 542820, STD10218893, CL90MB1J20-M0EAY0 |
| Additional EANs | 0197105797147 |
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