PRIME B840M-A-CSM
ASUS Prime series motherboards are expertly engineered to unleash the full potential of AMD Ryzen™ 9000 series processors. The PRIME B840M-A-CSM motherboard provides users and PC DIY builders with a range of performance optimizations via intuitive software and firmware features. It’s designed to be Advanced AI PC-ready, offering the power and connectivity needed for demanding AI applications.
Enhanced DDR5 performance
Comprehensive memory tuning options are the cornerstone of PRIME motherboards. The PRIME B840M-A-CSM maximizes the potential of your DDR5 modules, from entry-level to extreme-speed kits.
For entry-level modules without EXPO™ support, ASUS Enhanced Memory Profile (AEMP) automatically detects memory chips and provides optimized profiles for enhanced performance.
For those looking to surpass stock DDR5 speeds, the PRIME B840M-A-CSM offers extensive AMD Extended Profiles for Overclocking (EXPO™) support and a wide array of UEFI settings for further performance tweaks.
Three M.2 slots (up to 64 Gbps)
PRIME B840M-A-CSM offers a total of three M.2 slots, including two that support data-transfer speeds of up to 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.
Cooler by design
The PRIME B840M-A-CSM motherboard is engineered with multiple onboard heatsinks and an array of hybrid fan headers to help ensure your rig stays cool and stable under intense workloads.
ASUS Fan Xpert 2+
ASUS Fan Xpert 2+ software provides comprehensive control over fans. An Auto-Tuning mode intelligently configures all parameters with a single click. There’s also an Extreme Quiet mode that reduces chassis fan speeds to below the default minimum to keep your system whisper-quiet when performing light tasks. Fans can also be controlled via the UEFI BIOS.
Empowering connections
This motherboard offers a versatile range of connectivity, including support for PCIe 4.0 slot and an arsenal of USB ports which includes Type-C® connections.
Realtek 2.5 Gb Ethernet
Realtek 2.5 Gb Ethernet reduces CPU overhead and offers exceptionally high TCP and UDP throughput for faster, smoother data transfers.
| Motherboard | |
| Platform | AMD |
| Socket | AM5 |
| Cpu Type | Ryzen 9000,Ryzen 8000,Ryzen 7000 |
| Chipset | B840 |
| Memory Speed | up to 7600+ |
| Max Memory Support | 192 GB |
| Supported Memory Type | DDR5 |
| Channel Supported | Dual Channel |
| Memory Feature | ECC and Non-ECC, Un-buffered DIMM Supports AMD Extended Profiles for Overclocking (EXPO™) ASUS Enhanced Memory Profile (AEMP) * Supported memory types, data rate (speed), and number of DRAM modules vary depending on the CPU and memory configuration, for more information please refer to CPU/Memory Support list under the Support tab of product information visit Brand Website . Adjustments will be made based on the specifications of mass-produced memory products available on the market. * Non-ECC, un-buffered DDR5 memory supports On-Die ECC function. |
| Graphics Port | 2 x DisplayPort,1 x HDMI |
| Expansion Slots | AMD Ryzen™ 9000 & 7000 Series Desktop Processors* 1 x PCIe 4.0 x16 slot (supports x16 mode) AMD Ryzen™ 8000 Series Desktop Processors 1 x PCIe 4.0 x16 slot (supports x8/x4 mode)** AMD B840 Chipset 2 x PCIe 3.0 x16 slots (support x1 mode) * Please check the PCIe bifurcation table on the support site ** Specifications vary by CPU types. |
| Back Panel I/O Ports | 2 x USB 10Gbps ports (2 x Type-A) 1 x USB 5Gbps port (1 x USB Type-C®) 4 x USB 2.0 ports (4 x Type-A) 2 x DisplayPort 1 x HDMI™ port 1 x Realtek 2.5Gb Ethernet port 3 x Audio jacks 1 x BIOS FlashBack™ button |
| Internal I/O Connector | 1 x 4-pin CPU Fan header 1 x 4-pin CPU OPT Fan header 2 x 4-pin Chassis Fan headers 1 x 24-pin Main Power connector 1 x 8-pin +12V CPU Power connector 3 x M.2 slots (Key M) 4 x SATA 6Gb/s ports 1 x USB 5Gbps connector (supports USB Type-C®) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports 3 x Addressable Gen 2 headers 1 x Clear CMOS header 1 x COM Port header 1 x Front Panel Audio header (F_AUDIO) 1 x S/PDIF Out header 1 x SPI TPM header (14-1 pin) 1 x 10-1 pin Front Panel System header |
| Form Factor | Micro-ATX |
| Warranty | 3 Years |
| Note | Features, Price and Specifications are subject to change without notice. Images use for Representation Purpose Only. |
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