Asus PRIME B840M-A-CSM AM5 Micro ATX Motherboard

Manufacturer's Website

Description

Introducing the Asus PRIME B840M-A-CSM AM5 Micro ATX Motherboard. A powerful and future-ready platform designed to unlock the full potential of AMDs latest Ryzen desktop processors. Built around the AMD B840 chipset, this motherboard supports AMD Ryzen 7000, 8000, and 9000 Series processors, providing a reliable foundation for gaming, content creation, productivity, and high-performance computing. Combining advanced connectivity, robust memory support, and user-friendly design features, the PRIME B840M-A-CSM delivers the flexibility and performance required for modern PC builds.

At the heart of the motherboard is support for the latest DDR5 memory technology, offering four DIMM slots with a maximum capacity of 256GB. With memory speeds reaching up to 7600+ MT/s (OC), users can take advantage of exceptional bandwidth and responsiveness for demanding applications and multitasking workloads. Support for AMD EXPO and ASUS Enhanced Memory Profile (AEMP) simplifies memory optimization, enabling users to achieve improved performance with minimal configuration effort. The PRIME B840M-A-CSM is designed to provide a fast and responsive computing experience through its advanced expansion and storage capabilities. A dedicated PCIe 4.0 x16 slot delivers high-bandwidth connectivity for modern graphics cards, ensuring smooth gaming performance and accelerated creative workflows. The motherboard also includes additional PCIe slots for expansion cards and supports up to three M.2 NVMe SSDs, allowing users to build ultra-fast storage configurations. Combined with four SATA 6Gb/s ports and support for multiple RAID configurations, the board offers excellent flexibility for both speed-focused and capacity-driven storage solutions.

Networking performance is enhanced by the inclusion of Realtek 2.5Gb Ethernet with ASUS LANGuard protection, delivering faster and more reliable wired network connectivity compared to traditional Gigabit Ethernet solutions. Whether used for competitive online gaming, high-speed file transfers, video streaming, or professional networking tasks, the 2.5Gb LAN connection helps ensure stable and efficient communication across modern networks. Connectivity options are comprehensive, making the motherboard well-equipped for both current and future peripherals. Rear-panel connectivity includes USB 10Gbps Type-A ports, USB 5Gbps Type-C, and multiple USB 2.0 connections, while front-panel headers provide additional high-speed USB support, including front-facing USB Type-C connectivity. These options allow users to connect a wide range of devices, external storage solutions, and accessories with ease.

Visual output support is equally impressive, featuring two DisplayPort outputs and one HDMI port for systems utilizing compatible Ryzen processors with integrated graphics. The DisplayPort connections support resolutions up to 8K at 30Hz, while HDMI 2.1 supports 4K at 60Hz, providing excellent flexibility for productivity workstations, multimedia setups, and multi-monitor environments. To ensure long-term stability and reliable operation, ASUS has equipped the PRIME B840M-A-CSM with a range of thermal and protective technologies. Multiple heatsinks and strategically positioned fan headers work alongside ASUS Fan Xpert 2+ to provide intelligent cooling control and maintain optimal operating temperatures. These features help prevent thermal throttling while supporting sustained performance during demanding workloads.

Building and upgrading a system is made simpler through ASUSs EZ PC DIY features. Technologies such as SafeSlot Core+, Q-LED Core, BIOS FlashBack, and the pre-mounted I/O shield streamline installation, troubleshooting, and maintenance. These thoughtful additions improve the overall building experience while enhancing durability and ease of use for both novice and experienced PC builders. For users who value aesthetics as much as performance, the motherboard supports Aura Sync RGB lighting, allowing compatible components and lighting accessories to be synchronized for a personalized and cohesive appearance. With its combination of next-generation DDR5 support, extensive storage options, PCIe 4.0 connectivity, 2.5Gb Ethernet, advanced cooling controls, and support for the latest AMD Ryzen processors, the ASUS PRIME B840M-A-CSM AM5 Micro-ATX Motherboard provides an exceptional foundation for a modern, high-performance desktop system.

Features

• Intel B840M Chipset
• Supports AMD Ryzen 9000 & 8000 & 7000 Series Desktop Processors
• Supports DDR5 Memory, Dual Channel DDR5 7600+ MT/s (OC) 256GB max capacity
• Ultra-fast Realtek 2.5G Ethernet LAN
• Lightning Fast Game experience: PCIe 4.0 slot support
• Asus Fan Xpert 2+ for more cooling control
• EZ PC DIY: SafeSlot Core+ and Q-LED Core, BIOS Flashback, and a pre-mounted I/O shield for easy usage
• Aura Sync support for full RGB lighting control

Specifications

Package Contents

• 1x Asus PRIME B840M-A-CSM AM5 Micro ATX Motherboard - Black
• 2x SATA Cables
• 1x M.2 rubber package
• 2x Screw Package for M.2 SSD
• 1x Quick Start Guide