Asus Prime B840-Plus WiFi VS Asus Prime B840M-A

Both boards share the same AM5 socket, making them compatible with the same range of AMD processors, and both offer a solid feature set for their tier: dual BIOS, easy BIOS reset, RGB lighting, overclocking support, a 3-year warranty, and HDMI 2.1 output. Neither board includes integrated graphics or a built-in CPU, so a discrete GPU or a processor with onboard graphics is required in both cases. For most buyers, these shared fundamentals mean the platform experience is essentially identical at the CPU and display-output level.

The most meaningful split between these two boards comes down to form factor and wireless connectivity. The Prime B840-Plus WiFi is a full ATX board (305 × 244 mm), while the Prime B840M-A is a Micro-ATX (244 × 244 mm). In practice, the smaller footprint of the Micro-ATX makes it better suited to compact or mid-tower builds with limited interior space, whereas the ATX variant gives builders more room for expansion slots and potentially better component spacing for airflow and cable management. Critically, the B840-Plus WiFi includes built-in Wi-Fi and Bluetooth, while the B840M-A offers neither — meaning users of the Micro-ATX board who need wireless connectivity must add a PCIe or USB adapter, which adds cost and occupies an expansion slot.

The Prime B840-Plus WiFi holds a clear advantage in this group. Its integrated wireless stack is a genuinely significant real-world benefit — eliminating the need for extra hardware and keeping the build cleaner — while its ATX size only matters if your case and use case call for a larger board. The B840M-A makes sense primarily for those who are certain they will use a wired network and need a smaller board; otherwise, the B840-Plus WiFi delivers more value out of the box.

The Asus Prime B840-Plus WiFi and Asus Prime B840M-A both support 4 memory slots and DDR5 memory, offering high-performance capabilities. They also share a maximum overclocked RAM speed of 7600 MHz and support 2 memory channels. These features ensure that both motherboards can handle fast and efficient memory configurations.

The primary difference between the two products lies in their maximum memory amount. The B840-Plus supports up to 192GB of memory, while the B840M-A can handle up to 256GB, offering more flexibility for users who need additional memory capacity. Neither motherboard supports ECC memory, so they are not suited for error-correcting memory tasks.

Overall, while the memory configurations are similar, the Asus Prime B840M-A offers more headroom for memory upgrades with its higher maximum memory capacity.

The Asus Prime B840-Plus WiFi and Asus Prime B840M-A offer a similar range of ports, with both featuring an HDMI output and RJ45 port for network connectivity. However, there are some differences in the USB ports between the two. The B840-Plus has 1 USB 3.2 Gen 2 USB-A port, 2 USB 3.2 Gen 1 USB-A ports, and 1 USB 3.2 Gen 2 USB-C port, while the B840M-A has 2 USB 3.2 Gen 2 USB-A ports and 1 USB 3.2 Gen 1 USB-A port, but lacks a USB 3.2 Gen 2 USB-C port.

Both motherboards offer 4 USB 2.0 ports, and neither model includes USB 3.2 Gen 2x2, USB 4 40Gbps, or Thunderbolt ports. The B840-Plus does not feature any DisplayPort outputs, while the B840M-A has 2 DisplayPort outputs. Neither motherboard has eSATA ports, DVI outputs, or a VGA connector, and both lack PS/2 ports.

Both products also include USB Type-C, but the B840-Plus has a USB 3.2 Gen 2 USB-C port while the B840M-A does not, making the B840-Plus slightly more versatile in terms of USB-C connectivity.

The Asus Prime B840-Plus WiFi and Asus Prime B840M-A share many similar features when it comes to connectors. Both motherboards offer 2 USB 3.2 Gen 1 ports, 4 USB 2.0 ports, and 2 USB 3.0 ports through expansion. They also both include 4 SATA 3 connectors, 3 M.2 sockets, and lack SATA 2 connectors. Additionally, neither model includes an mSATA connector, and neither has U.2 sockets.

One notable difference between the two is the number of fan headers. The B840-Plus has 6 fan headers, providing more flexibility for cooling options, while the B840M-A has 4 fan headers.

Both motherboards support a TPM connector, ensuring security features are available for users who require it, but otherwise, their connector specifications are closely matched across the board.

The Asus Prime B840-Plus WiFi and Asus Prime B840M-A share a similar configuration when it comes to PCIe 4.0 x16 slots, with both featuring 1 slot. Neither motherboard includes any PCIe 5.0 x16 slots. However, there is a difference in the number of PCIe 3.0 x16 slots: the B840-Plus has 3, while the B840M-A has 2, offering slightly more expansion options for the B840-Plus.

Both motherboards do not include any PCIe x1, PCI, PCIe 2.0 x16, PCIe x4, or PCIe x8 slots, so expansion through these types of slots is not possible on either board.

Overall, the B840-Plus offers more PCIe 3.0 x16 slots, which might be useful for users needing additional high-speed expansion, but the overall slot types are very similar between the two models.

Both the Asus Prime B840-Plus WiFi and Asus Prime B840M-A feature 7.1 audio channels, providing immersive sound capabilities. Neither motherboard includes an S/PDIF Out port, so users won’t have the option for digital audio output via this method.

In terms of physical audio connectors, both motherboards are equipped with 3 audio connectors, allowing for standard audio input and output options for speakers and microphones.

Overall, the audio specifications are identical between the two products, with both supporting high-quality audio channels and offering the same set of audio connectors.

The Asus Prime B840-Plus WiFi and Asus Prime B840M-A both support the same RAID configurations. These include RAID 1, RAID 10 (1+0), RAID 5, and RAID 0, offering flexibility for users looking to configure their storage for redundancy or performance. Both motherboards do not support RAID 0+1, so users looking for that specific configuration will need to look elsewhere.

In terms of RAID functionality, the specifications are identical for both models, meaning they offer the same storage options and capabilities for users interested in creating various RAID setups.

Overall, there is no difference in storage configuration between the two motherboards, as both support the same set of RAID levels.