ASUS PRIME B840M-A-CSM AMD Micro-ATX Motherboard
ASUS PRIME B840M-A-CSM, AMD B840, AM5, DDR5, PCIe 4.0, 3x M.2, 2.5GbE, USB 10Gbps, mATX
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- From £13.59 / month (APR 16.9%) for 12 months or 0% for 4 months
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PRIME B840M-A (CSM) PCIe 4.0 DDR5 AMD Micro-ATX Motherboard From ASUS
built to last The ASUS Prime B840M-A CSM motherboard is engineered to unleash the capabilities of AMD Ryzen™ 9000 series processors with a strong power setup, advanced cooling, and user-friendly tuning options. Packed with four M.2 slots, it offers ample room for high-speed storage, while PCIe® 4.0 x16 support gears it for modern graphics. Built for the future, it provides a combination of legacy and modern USB connections, ideal for gaming setups. With intuitive software and firmware, it’s crafted for PC builders aiming for high and reliable performance.
B840AMD Chipset
AM5CPU Socket
DDR5 DIMMMax. 192GB (4 x 48GB)
MicroATXForm Factor
Masterfully Layered VRM
Robust ArchitectureStable power is crucial for squeezing max performance from AMD processors. It features 8 + 2 + 1 power stages that integrate high-side and low-side MOSFETs and drivers into packages rated equally. This configuration ensures optimal power delivery, efficiency, stability and performance for both current and future AMD processors.
8VCORE Phases
2SOC Phases
1Misc. Power
Alloy ChokesHighly permeable alloy-core chokes per phase.
High Quality CapsLasts thousands of hours at high operating temperatures.
6-Layer PCB DesignHigh speed, server-grade signal integrity.
Solid-Pin ConnectorsStable, reliable and long-lasting ATX & EPS connectors.
Memory & Storage Synergy
DDR5 DominationASUS Enhanced Memory Profile (AEMP) automatically detects memory chips and provides optimised profiles for enhanced performance. For those looking to surpass stock DDR5 speeds, the B840M-A offers extensive AMD Extended Profiles for Overclocking (EXPO™) support and a wide array of UEFI settings for further performance tweaks.
Loaded With M.2 SlotsB840M-A offers a total of three M.2 slots, including two that support 64 Gbps via PCIe 4.0, and one that supports PCIe 3.0. This enables quicker boot-up and app load times with OS or application drives.
DIY Friendly
GREAT FOR BEGINNER BUILDSThe B840M-A motherboard introduces EZ PC DIY features that streamline the building process for convenience and speed. A physical lever unlocks the first PCIe slot’s security latch with a single tap, simplifying the removal of graphics cards or other devices during upgrades. The ASUS Q-Latch offers tool-free M.2 SSD installation, using a simple locking mechanism for easy drive attachment and removal. Additionally, the Q-LED Core display provides color-coded lights during the Power-On Self-Test (POST), assisting with quick troubleshooting of potential issues.
Pre-Mounted I/O ShieldThe pre-installed I/O shield safeguards ports, simplifies the build process, increases functionality and enhances aesthetics for PC DIY enthusiasts.
BIOS Flashback™BIOS FlashBack™ simplifies BIOS updates. Just load the BIOS file onto a FAT32 USB stick, insert it into the port, and press a button—no CPU or memory needed.
PCIe Safe SlotASUS have adapted SMT manufacturing for the faster SafeSlot, a reinforced metal lining that ensures secure card installation and faster data speeds.
NOTE: The I/O shield shown does not reflect the current product. You are currently viewing the CSM (Non-WiFi) variant.
Easy & Adaptive
Armoury CrateCustomize Aura Sync RGB and control ASUS devices. Includes product registration and updates.
UEFI BIOSThe UEFI interface delivers easy-to-use configuration options for PC beginners, and advanced features for veterans.
CSM: Corporate Stable Model
Built for BusinessesThe ASUS Corporate Stable Model (CSM) is a commercial program aimed at providing businesses with reliable, long-term motherboard support. ASUS states that the program offers up to 36 months of product lifecycle support and a 6-month end-of-life notice, helping organisations plan ahead for hardware transitions. Each purchase of an ASUS CSM motherboard comes with ASUS Control Center Express - server-grade IT management software.
IT AssistanceMonitor and control workplace devices remotely with real-time oversight and streamlined inventory tracking across multiple locations.
Automated MaintainanceSchedule BIOS, software, and utility updates during off-peak hours to boost system stability and boost IT efficiency. Work smarter, not harder.
Endpoint ManagementEnforce security policies, manage configurations, and control software access with custom grouping rules for every device. Make networking 'work' for you.
Frosted Flow
Laden With Heatsinks
• VRM & Thermal Pads from MOSFETs and chokes.
• M.2 Heatsink for throttling prevention.
• Passive Chipset Heatsink for performance and dust protection.
Radiator/Fan Support
• x1 AIO Pump Header
• x2 4-Pin PWM/DC
• x2 CPU Fan Headers
Premium ConstructionThis motherboard features high-quality materials in its heatsinks, allowing for steady heat dissipation and lasting durability. Built to handle advanced cooling setups, it’s ready for both air and liquid cooling options, keeping everything cool and running smoothly even under heavy loads.
Sleek Access for Seamless Action
Link Up With EaseThis motherboard offers extensive connectivity, with a well-organised layout that makes linking all your components a breeze. The stylish backplate not only adds a sleek touch but also reinforces the build for added stability. With its intuitive design, it’s perfect for beginners looking to dive into PC building, offering a user-friendly experience without compromising on quality or capability.
PayPal Credit
| Monthly Payment: | £13.59 |
| Instalment Rate: | 16.9% p.a. (fixed) |
| Cost of purchase: | £149.99 |
| Total inc. interest: | £163.06 |
| Example | |
| Minimum Spend: | £99 |
| Instalment Rate: | N/A |
| Cost of purchase: | £99 |
| Total inc. interest: | £99 |
Representative Example:
Purchase Rate: 23.9% p.a. (variable)
Representative: 23.9% APR (variable)
Assumed Credit Limit: £1,200
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