ASUS PRIME B840M-A WIFI-CSM

Overview

The ASUS PRIME B840M-A WIFI-CSM is a micro ATX motherboard designed for AMD AM5 socket processors, supporting Ryzen 7000, 8000, and 9000 series CPUs. It offers a compact form factor that fits well in smaller cases while providing extensive expansion options for gaming, content creation, and professional use. With support for up to 192 GB of DDR5 memory at speeds reaching 7600 MT/s, this board delivers the bandwidth needed for demanding applications and multitasking.

Storage options include three M.2 slots—two PCIe 4.0 and one PCIe 3.0—alongside four SATA III ports, allowing for a versatile combination of fast NVMe drives and high-capacity storage. The motherboard also features multiple PCIe slots for graphics cards and peripherals, integrated Wi-Fi 6E and Bluetooth 5.3 for wireless connectivity, and a 2.5 Gb Ethernet port for reliable wired networking.

Key features

• AM5 socket compatibility with Ryzen 7000, 8000, and 9000 series processors, enabling future upgrades without changing the motherboard
• Four DDR5 DIMM slots supporting up to 192 GB of high-speed memory at 7600 MT/s, ensuring smooth performance in memory-intensive tasks
• Three M.2 slots for flexible storage setups, including two PCIe 4.0 NVMe drives for fast boot and load times, plus one PCIe 3.0 slot for additional storage
• Dual PCIe 4.0 x16 slots for high-performance graphics cards or compute accelerators, plus two PCIe 3.0 x16 slots operating at x1 for sound cards or network adapters
• Integrated HDMI 2.1 and DisplayPort 1.4 outputs to support display connectivity without requiring a discrete GPU, ideal for office or media setups
• Wi-Fi 6E tri-band and Bluetooth 5.3 provide fast and stable wireless connections for peripherals and internet access
• Realtek 2.5 Gb Ethernet port delivers low-latency wired networking suitable for gaming and professional workloads
• Rear USB ports include a 10 Gb/s Type-A and a 5 Gb/s Type-C connector, supporting fast data transfer and charging for modern devices
• BIOS FlashBack button allows easy firmware updates without needing a CPU installed, simplifying maintenance and upgrades
• Realtek 7.1-channel audio codec supports 24-bit, 192 kHz playback for clear and detailed sound in calls, music, and movies

Key specs

• Chipset: AMD B840
• Socket: AM5
• Memory: 4x DDR5 DIMM slots, up to 192 GB, 7600 MT/s
• Storage: 3x M.2 slots (2x PCIe 4.0, 1x PCIe 3.0), 4x SATA III ports
• Expansion slots: 2x PCIe 4.0 x16, 2x PCIe 3.0 x16 (x1 mode)
• Video outputs: HDMI 2.1, DisplayPort 1.4
• Networking: Wi-Fi 6E tri-band, Bluetooth 5.3, Realtek 2.5 Gb Ethernet
• USB ports: Rear USB 10 Gb/s Type-A, USB 5 Gb/s Type-C
• Audio: Realtek 7.1-channel codec, 24-bit/192 kHz playback

Connectivity and compatibility

This motherboard supports a wide range of modern connectivity options to fit various setups. The Wi-Fi 6E tri-band radio ensures fast wireless internet access with minimal interference, while Bluetooth 5.3 allows seamless connection to peripherals like keyboards, mice, and headphones. The 2.5 Gb Ethernet port provides a stable wired connection for tasks requiring low latency, such as online gaming or video conferencing.

• Multiple USB ports on the rear panel accommodate fast external storage and peripherals
• Display outputs support high-resolution monitors without needing a dedicated graphics card
• Expansion slots allow installation of additional cards for enhanced audio, networking, or graphics performance

Ideal uses and environments

The ASUS PRIME B840M-A WIFI-CSM is well suited to users building compact yet powerful systems. Gamers will appreciate the dual PCIe 4.0 x16 slots for high-end graphics cards, while content creators benefit from the high-speed DDR5 memory and multiple M.2 storage options. Office professionals and home users can rely on integrated graphics outputs and robust networking features for smooth productivity and media consumption. Its balance of size, performance, and connectivity makes it a strong choice for small form factor builds that do not compromise on expandability.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Shipping costs are calculated at checkout based on destination, total weight, and selected speed. Free shipping applies to carts over $100 (excluding heavyweight items). All available options and final pricing are clearly shown before payment so you can choose the service that best fits your needs.

Deliveries are handled by major carriers such as USPS, UPS, and FedEx. Estimated delivery times are displayed at checkout and may vary depending on service level and location. Please note that these are estimates and can be affected by weather, holidays, or carrier volume. Once your order ships, you’ll receive a tracking number for real-time updates from pickup to final delivery.

Providing an accurate shipping address helps prevent delays, and changes may be limited once the order has been dispatched. P.O. boxes are supported only when permitted by the selected carrier. Packaging and handoff are optimized to protect items during transit, though oversized or high-weight products may require special handling. All shipping methods and any related constraints are clearly shown during checkout.

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Returns are accepted within 30 days of delivery. Items must be unused, in the same condition received, and include all tags, manuals, accessories, and original, unaltered packaging. To start a return, please email us for approval. Items sent back without approval may be refused or returned to the sender. If any item is kept, its value will be deducted from the refund.

Non-returnable items include opened TVs, combos, or monitors 37″ or larger, opened computers or software, electronic downloads, opened consumables (film, paper, bulbs, media, ink), custom or modified computers, special-order or “nonreturnable” items, submerged underwater gear, and opened educational media.

After inspection, refunds are issued to the original payment method. Please allow 5–7 business days for the credit to post. Shipping and handling are nonrefundable. If an item is used, incomplete, or not in its original condition, a 30% restocking fee may apply. Direct exchanges are not offered. To exchange an item, please purchase the replacement separately and return the original for a refund.

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We act solely as a reseller. Any product warranty is provided and administered by the manufacturer, not by our store. That means eligibility, coverage, and outcomes are determined by the manufacturer’s policy for each brand and model. Before purchasing, we recommend reviewing the warranty terms on the manufacturer’s website or in the product documentation to confirm what is covered and for how long.

If you need warranty service, please file the claim directly with the manufacturer. They may require proof of purchase, the product serial number, original packaging, photos, or basic troubleshooting. Some brands ask you to register the product or obtain a case number before shipping it for repair or replacement. We don’t submit or approve claims, but we can point you to the correct support links and contact details.

Keep your invoice and packaging in a safe place, and report any functional issues to the manufacturer as soon as they appear. If you’re unsure whether a problem is covered, the manufacturer’s support team can confirm next steps and timelines. While we cannot intervene in decisions or outcomes, we’re happy to provide purchase documentation or guidance so you can move through the warranty process smoothly.

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