PRIME B840M-R - Motherboard ASUS - Free user manual and instructions
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| Product Type | Motherboard (Micro-ATX form factor) |
| Brand | ASUS |
| Model | PRIME B840M-R |
| CPU Socket | AMD AM5 |
| Chipset | AMD B840 |
| Memory Support | 4 x DDR5 DIMM slots, maximum 128 GB |
| Memory Speed | Up to 8000 MHz (overclocked) |
| Expansion Slots | 1 x PCIe 4.0 x16, 1 x PCIe 4.0 x1 |
| Storage | 2 x M.2 slots (PCIe 4.0 x4), 4 x SATA 6 Gb/s ports |
| Networking | Realtek 2.5 Gb Ethernet |
| Audio | Realtek 7.1 Surround Sound |
| USB Ports (Rear) | 2 x USB 3.2 Gen2 Type-A, 2 x USB 3.2 Gen1, 4 x USB 2.0 |
| Dimensions | 244 x 244 mm (9.6 x 9.6 inches) |
| Weight | Approximately 0.85 kg (1.87 lbs) |
| Power Connectors | 24-pin ATX, 8-pin EPS for CPU |
| Main Features | Supports AMD Ryzen 7000/8000/9000 series, DDR5 overclocking, BIOS FlashBack |
| Maintenance | Clean with a dry soft cloth; avoid liquids and abrasive cleaners |
| Safety | Handle with anti-static precautions; install in a well-ventilated case |
| Spare Parts | CMOS battery, M.2 mounting screws, I/O shield available |
| General Information | ASUS UEFI BIOS, Q-LED indicators, designed for everyday productivity |
Frequently Asked Questions - PRIME B840M-R ASUS
What CPUs are compatible with the PRIME B840M-R?
This motherboard supports AMD Ryzen 7000, 8000, and 9000 series processors for the AM5 socket. For a full list, check the ASUS website. Always update BIOS before installing a new CPU.
How do I install memory modules?
Install DDR5 modules into the DIMM slots following the manual's recommendation. For dual-channel, use slot A2 and B2 first. Ensure the module clicks into place. Match the notch on the module with the slot.
How do I update the BIOS?
Use the ASUS EZ Flash 3 tool within UEFI, or use the BIOS FlashBack feature with a USB drive. Download the latest BIOS from the ASUS support page.
Does the PRIME B840M-R support PCIe 5.0?
No, this motherboard provides PCIe 4.0 lanes for both the graphics card and M.2 slots. PCIe 5.0 is reserved for higher-end X870/B850 models.
How many M.2 drives can I install?
There are 2 x M.2 slots supporting PCIe 4.0 x4. Both support NVMe SSDs of varying sizes (2242/2260/2280).
What is the maximum memory speed?
With overclocking, DDR5 speeds up to 8000 MHz are supported. However, stability depends on the CPU and memory kit. Default speed is 4800 MHz.
Does the motherboard have RGB lighting?
The PRIME B840M-R does not include built-in RGB, but it has 3-pin ARGB headers and 4-pin RGB headers for connecting your own lighting.
How do I reset the CMOS?
To clear the BIOS settings, either remove the CMOS battery for a few minutes or use the clear RTC jumper/button (if present). Refer to the manual for exact location.
Is the motherboard compatible with Windows 11?
Yes, it supports Windows 11 64-bit. Ensure you have TPM 2.0 enabled in the BIOS under Security.
How do I connect the front panel connectors?
Refer to the front panel header layout in the manual. Typically, you connect power switch, reset, LED, and audio/USB cables using the Q-Connector or motherboard markings.
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USER MANUAL PRIME B840M-R ASUS
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Product information
Brand : ASUS
Model : PRIME B840M-R
Category : Motherboard