ASUS PRIME B840M-A-CSM | AM5 Socket | AMD B840 Chipset | DDR5 256GB | PCIe 4.0 – New
R2,171.48
Your AMD Ryzen Build Starts Here
The ASUS PRIME B840M-A-CSM gives you a rock-solid foundation for your next AMD Ryzen build. Compatible with Ryzen 7000, 8000, and 9000 Series processors, it delivers the performance headroom gamers and creators need — without compromise.
PCIe 4.0 Speed, No Bottlenecks
With a PCIe 4.0 x16 slot, your GPU and NVMe SSD get double the bandwidth of the previous generation. Whether you’re loading into a game or rendering a project, fast data throughput means less waiting and more doing.
Built for Builders Who Mean Business
ASUS has loaded this board with DIY-friendly features like SafeSlot Core+ for a secure graphics card fit, Q-LED Core for instant fault diagnosis, and BIOS FlashBack so you can update your firmware without a CPU installed. Building a PC has never been this straightforward.
Connectivity That Keeps Up With You
From Realtek 2.5G Ethernet for lag-free online gaming to USB Type-C front and rear ports, plus Realtek 7.1 Surround Sound audio, this Micro ATX board keeps all your peripherals and devices running at full speed.
56 in stockIn stock with Supplier - Ships in 2-3 working days
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CPU Socket
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AMD Socket AM5 |
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Supported Processors
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AMD Ryzen™ 9000, 8000 & 7000 Series Desktop Processors |
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Chipset
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AMD B840 |
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Operating System
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Windows 11, Windows 10 64-bit |
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Memory Slots
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4 x DIMM slots |
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Memory Type
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DDR5, Dual Channel |
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Max Memory
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256GB |
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Memory Speed
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Up to 7600+ MT/s (OC) with Ryzen™ 9000, 8000 & 7000 Series |
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Memory Profiles
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AMD EXPO™, ASUS Enhanced Memory Profile (AEMP) |
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PCIe Slots
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1 x PCIe 4.0 x16 (x16 mode for Ryzen 9000/7000; x8/x4 for Ryzen 8000); 2 x PCIe 3.0 x16 (x1 mode, from B840 Chipset) |
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M.2 Slots
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3 x M.2 slots: M.2_1 (PCIe 4.0 x4, type 2280), M.2_2 (PCIe 4.0 x4, type 2242/2260/2280), M.2_3 (PCIe 3.0 x4, type 2280) |
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SATA Ports
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4 x SATA 6Gb/s |
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RAID
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AMD RAIDXpert2: RAID 0/1/5/10 (Ryzen 9000); RAID 0/1 (Ryzen 8000); RAID 0/1/10 (Ryzen 7000) |
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Display Outputs
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2 x DisplayPort 1.4 (supports up to 8K@30Hz), 1 x HDMI 2.1 (supports up to 4K@60Hz) |
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Ethernet
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1 x Realtek 2.5Gb Ethernet with ASUS LANGuard |
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Rear USB Ports
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2 x USB 10Gbps (Type-A), 1 x USB 5Gbps (Type-C), 4 x USB 2.0 (Type-A) |
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Front USB Headers
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1 x USB 5Gbps Type-C connector, 1 x USB 5Gbps header (2 additional ports), 2 x USB 2.0 headers (4 additional ports) |
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Audio
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Realtek 7.1 Surround Sound HD Audio CODEC, up to 24-Bit/192kHz, 3 x audio jacks; Audio Shielding, premium capacitors, dedicated PCB layers |
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Form Factor
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Micro ATX |
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RGB Lighting
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Aura Sync support for full RGB lighting control |
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Cooling
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Multiple heatsinks, ASUS Fan Xpert 2+ with multiple fan headers |
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DIY Features
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SafeSlot Core+, Q-LED Core, BIOS FlashBack™, pre-mounted I/O shield |
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In the Box
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Motherboard x1, SATA Cables x2, M.2 rubber package x1, Screw Package for M.2 SSD x2, Quick Start Guide x1 |
| Weight | 1.351 kg |
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| Dimensions | 28 × 28 × 7 cm |
| Brand |
ASUS |
| Colour |
Black |
| Warranty |
36 Months |
