ASUS PRIME B840M-A-CSM | AM5 Socket | AMD B840 Chipset | DDR5 256GB | PCIe 4.0 – New
R2,202.07 incl. VAT
⚡ EFT price: R2,180.05 — when you pay by EFT
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.
40 in stockIn stock with Supplier - Ships in 2-3 working days
CPU Socket | AMD Socket AM5 |
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Supported Processors | AMD Ryzen™ 9000, 8000 & 7000 Series Desktop Processors |
Chipset | AMD B840 |
Operating System | Windows 11, Windows 10 64-bit |
Memory Slots | 4 x DIMM slots |
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Memory Type | DDR5, Dual Channel |
Max Memory | 256GB |
Memory Speed | Up to 7600+ MT/s (OC) with Ryzen™ 9000, 8000 & 7000 Series |
Memory Profiles | AMD EXPO™, ASUS Enhanced Memory Profile (AEMP) |
PCIe Slots | 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 | 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) |
SATA Ports | 4 x SATA 6Gb/s |
RAID | AMD RAIDXpert2: RAID 0/1/5/10 (Ryzen 9000); RAID 0/1 (Ryzen 8000); RAID 0/1/10 (Ryzen 7000) |
Display Outputs | 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 | 1 x Realtek 2.5Gb Ethernet with ASUS LANGuard |
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Rear USB Ports | 2 x USB 10Gbps (Type-A), 1 x USB 5Gbps (Type-C), 4 x USB 2.0 (Type-A) |
Front USB Headers | 1 x USB 5Gbps Type-C connector, 1 x USB 5Gbps header (2 additional ports), 2 x USB 2.0 headers (4 additional ports) |
Audio | Realtek 7.1 Surround Sound HD Audio CODEC, up to 24-Bit/192kHz, 3 x audio jacks; Audio Shielding, premium capacitors, dedicated PCB layers |
Form Factor | Micro ATX |
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RGB Lighting | Aura Sync support for full RGB lighting control |
Cooling | Multiple heatsinks, ASUS Fan Xpert 2+ with multiple fan headers |
DIY Features | SafeSlot Core+, Q-LED Core, BIOS FlashBack™, pre-mounted I/O shield |
In the Box | 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 |
|---|---|
| Dimensions | 28 × 28 × 7 cm |
| Brand | ASUS |
| Colour | Black |
| Warranty | 36 Months |
