ASUS PRIME B840M-A-CSM mATX Motherboard | AM5 | 4x DDR5 Slots
KEY FEATURES
- AMD Socket AM5 AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series
- PC micro ATX AMD B840 7.1 channels
- DDR5-SDRAM 4 DIMM Maximum internal memory: 192 GB
- HDD & SSD M.2, SATA III RAID support Number of storage drives supported: 7
- BIOS type: UEFI AMI 256 Mbit
- 2.5 Gigabit Ethernet
100% Safe & Secure Checkout
Reviews
Frequently Asked Questions
What processors are compatible with the ASUS PRIME B840M-A-CSM?
How many M.2 slots does this motherboard have?
What type of memory does this motherboard support?
ASUS PRIME B840M-A-CSM mATX Motherboard | AM5 | 4x DDR5 Slots
Description
The ASUS PRIME B840M-A-CSM brings AMD's latest B840 chipset to a compact mATX form factor, making it an excellent choice for builders who need modern AM5 platform features without the bulk of a full-size board. This commercial-grade motherboard supports the latest Ryzen processors from the 7000, 8000, and 9000 series, delivering solid performance for both business and home systems where space efficiency matters.
Memory support is comprehensive with four DDR5 slots accommodating up to 192GB of system RAM and speeds reaching 7600MHz when using compatible modules. Storage flexibility comes through three M.2 slots - two PCIe 4.0 slots for high-speed NVMe drives and one PCIe 3.0 slot for additional storage. The single PCIe 4.0 x16 slot provides full bandwidth for modern graphics cards, while the board includes practical touches like multiple RGB LED headers for custom lighting and dual CPU fan connectors for flexible cooling setups.
ECC memory compatibility adds professional reliability when using supported processors and modules, making this board suitable for workstations and small business systems. ASUS includes mounting screws in the package alongside the standard I/O shield and documentation. The PRIME B840M-A-CSM delivers AMD's current-generation platform benefits in a space-conscious design that doesn't compromise on essential connectivity and expansion options.
Feature
Easy 14 days Returns
Eligible for Next day Delivery
100% Money-back guarantee
Reliable Customer Support
Secure payment method
Shipping Information
- Next Business Day: £6.99
- 2 days Delivery: £4.99
- 3- 5 Days Shipping: £3.99
- Orders Over £99.00: Free Standard Delivery
| 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 |
| Supported memory clock speed (max) | 7600 MHz |
| 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 storage drives supported | 7 |
| Number of HDDs supported | 4 |
| RAID support | Yes |
| RAID levels | 0, 1, 5, 10 |
| Graphics | |
|---|---|
| Parallel processing technology support | Not supported |
| Maximum resolution | 7680 x 4320 pixels |
| 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 CPU fan connectors | 2 |
| Number of chassis fan connectors | 2 |
| EPS power connector (8-pin) | Yes |
| Number of EPS power connectors (8-pin) | 1 |
| TPM connector | Yes |
| Number of COM connectors | 1 |
| RGB LED pin header | Yes |
| Number of RGB LED pin headers | 3 |
| 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 |
| HDMI version | 2.1 |
| DisplayPorts quantity | 1 |
| DisplayPort version | 1.4 |
| Line-in | Yes |
| Headphone outputs | 1 |
| Network | |
|---|---|
| Ethernet LAN | Yes |
| Ethernet interface type | 2.5 Gigabit Ethernet |
| Wi-Fi | No |
| Top Wi-Fi standard | Not available |
| Features | |
|---|---|
| Component for | PC |
| Motherboard form factor | micro ATX |
| Motherboard chipset family | AMD |
| Motherboard chipset | AMD B840 |
| Audio output channels | 7.1 channels |
| Product colour | Grey |
| Power source type | ATX |
| Windows operating systems supported | Windows 10 x64, Windows 11 |
| Expansion slots | |
|---|---|
| PCI Express x16 (Gen 4.x) slots | 1 |
| PCI Express x16 (Gen 3.x) slots | 2 |
| 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 | 1.45 kg |
| Weight & dimensions | |
|---|---|
| Width | 244 mm |
| Depth | 244 mm |
| Packaging content | |
|---|---|
| Screws included | Yes |
| Cables included | SATA |
| Other features | |
|---|---|
| Weight | 910 g |
| Quick installation guide | Yes |
Frequently Asked Questions
What processors are compatible with the ASUS PRIME B840M-A-CSM?
How many M.2 slots does this motherboard have?
What type of memory does this motherboard support?
Is there a warranty for the ASUS PRIME B840M-A-CSM?
Can’t find what you’re looking for?
Our friendly support team is just a message away, ready to assist with anything. Our team is experienced with gaming gear, home tech, and everything in between—feel free to reach out.
📧 Email: help@gotraka.com
📞 Phone: 020 8208 1234
💬 Live Chat: Available 9 AM – 6 PM ( Monday - Friday )
