ASUS PRIME B840M-A-CSM micro ATX motherboard
£138.36 inc VAT
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About This Item
- micro ATX motherboard for AMD Ryzen 7000/8000/9000 series on Socket AM5
- 3 M.2 slots with PCIe 4.0 support up to 64 Gbps for fast storage
- DDR5 memory support up to 192 GB at 7600 MHz with ECC compatibility
- AMD B840 chipset with 7.1 audio, HDMI 2.1, and DisplayPort 1.4
- 2.5 Gb Ethernet, USB 3.2 Gen 2 Type-A, and front USB 5Gbps Type-C ports
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ASUS PRIME B840M-A-CSM | Micro ATX AMD Ryzen Motherboard
The ASUS PRIME B840M-A-CSM AMD B840 Socket AM5 micro ATX motherboard is built for PC DIY builders seeking reliable performance with AMD Ryzen 7000, 8000, and 9000 series processors. Designed as part of ASUS’s Corporate Stable Model (CSM) program, it offers up to 36 months of lifecycle support, making it ideal for both home builds and business environments where long-term stability matters.
Key Specifications
| Metric | Spec |
|---|---|
| Socket | AMD AM5 |
| Memory Support | DDR5 up to 7600 MHz, 192 GB max |
| M.2 Slots | 3 (2x PCIe 4.0, 1x PCIe 3.0) |
| LAN | Realtek 2.5 Gb Ethernet |
| Form Factor | Micro ATX |
| Audio | 7.1 channels |
Performance That Stays Cool Under Pressure
The PRIME B840M-A-CSM uses an 8+2+1 phase digital VRM design with discrete MOSFETs to deliver stable power to AMD Ryzen processors. This ensures efficient operation during demanding workloads or light gaming sessions. The multi-layered PCB and onboard heatsinks help dissipate heat quickly, maintaining system stability even when overclocking or running intensive applications.
Memory and Storage Ready for Tomorrow
Supporting DDR5 memory with speeds up to 7600 MHz and a maximum capacity of 192 GB, this motherboard is future-proofed for high-performance tasks. ASUS Enhanced Memory Profile (AEMP) optimises performance for non-EXPO kits, while full AMD EXPO support unlocks higher speeds for compatible modules. With three M.2 slots offering up to 64 Gbps via PCIe 4.0, boot times and application loads are noticeably faster.
Smart Cooling for Quiet Operation
ASUS Fan Xpert 2+ provides intelligent fan control with Auto-Tuning and Extreme Quiet modes, automatically adjusting speeds based on system load. Whether you’re working in a quiet office or pushing your system during a gaming session, the cooling solution keeps noise levels low without sacrificing performance.
Connectivity That Keeps You Online
Equipped with Realtek 2.5 Gb Ethernet, the motherboard reduces CPU overhead for smoother data transfers—ideal for streaming, large file transfers, or online gaming. A front-panel USB 5Gbps Type-C connector offers quick access for modern devices, while HDMI 2.1 and DisplayPort 1.4 outputs support high-resolution displays.
Box Contents
- ASUS PRIME B840M-A-CSM motherboard
- SATA cables
- Screws
- Quick installation guide
Things to Check First
- Confirm your AMD Ryzen processor is compatible with Socket AM5.
- Verify your DDR5 memory kit meets the motherboard’s speed and capacity limits.
- Check that your case supports micro ATX form factor (244 mm x 244 mm).
- Ensure your power supply has the required 24-pin ATX and 8-pin EPS connectors.
Buyer FAQs
Does this motherboard support Wi-Fi?
Can I overclock my CPU with this board?
How many graphics cards can I install?
What type of storage drives are supported?
Is the BIOS easy to update?
The bottom line
The ASUS PRIME B840M-A-CSM is a dependable micro ATX motherboard for users who want long-term stability, strong performance, and future-proof features like DDR5 and PCIe 4.0. Its Corporate Stable Model status makes it especially suited for business or professional environments where product lifecycle support is critical. Covered by the applicable manufacturer warranty, it offers peace of mind alongside its robust build quality.
| Front panel connector | Yes |
|---|---|
| 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 | 2 |
| Front panel audio connector | Yes |
| EPS power connector 8-pin | Yes |
| CPU fan connector | Yes |
| ATX Power connector 24-pin | Yes |
| RGB LED pin header | Yes |
| Number of CPU fan connectors | 2 |
| Number of EPS power connectors 8-pin | 1 |
| Number of RGB LED pin headers | 3 |
| Processor manufacturer | AMD |
| Compatible processor series | AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series |
| Processor socket | Socket AM5 |
| Number of memory slots | 4 |
| Memory slots type | DIMM |
| Memory channels | Dual-channel |
| Maximum internal memory | 192 GB |
| Unbuffered memory | Yes |
| Supported memory clock speed max | 7600 MHz |
| ECC сompatibility | ECC & Non-ECC |
| Number of HDDs supported | 4 |
| Supported storage drive types | HDD & SSD |
| Supported storage drive interfaces | M.2, SATA III |
| RAID levels | 1, 5, 10 |
| Number of storage drives supported | 7 |
| RAID support | Yes |
| Parallel processing technology support | Not supported |
| 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 |
| DisplayPort version | 1.4 |
| USB 2.0 ports quantity | 4 |
| Headphone outputs | 1 |
| HDMI ports quantity | 1 |
| Ethernet LAN RJ-45 ports | 1 |
| DisplayPorts quantity | 1 |
| Line-in | Yes |
| Motherboard chipset family | AMD |
| Supported processor sockets | Socket AM5 |
| Audio output channels | 7.1 channels |
| Component for | PC |
| Product colour | Grey |
| 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 type | UEFI AMI |
| BIOS memory size | 256 Mbit |
| Power source type | ATX |
| Maximum resolution | 7680 x 4320 pixels |
| Windows operating systems supported | Windows 10 x64, Windows 11 |
| Width | 244 mm |
| Depth | 244 mm |
| Cables included | SATA |
| Screws included | Yes |
| Package width | 275 mm |
| Package depth | 275 mm |
| Package height | 67.5 mm |
| Package weight | 1.45 kg |
| Weight | 910 g |
| Quick installation guide | Yes |
| Distributor SKUs | MBD-90MB1J10-M0EAYC, 11508498, 126174, 542816, STD10218894, 2110373, CL90MB1J10-M0EAYC |
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