Asus Prime B840-Plus WiFi VS MSI Pro B840M-P Wi-Fi6E

Both boards share the same AM5 socket and B840 chipset, meaning they target the same generation of AMD processors with identical platform-level capabilities. Connectivity is also a wash: both include Wi-Fi 6E (covering 802.11n/ac/ax across 2.4, 5, and 6 GHz bands), Bluetooth 5.3, and HDMI 2.1, so neither board holds an edge in wireless or display output. The 3-year warranty and shared features like RGB lighting, easy BIOS reset, and overclock support further level the playing field at a platform level.

The clearest split between these two boards is form factor. The Asus Prime B840-Plus WiFi is a full ATX board at 305 × 244 mm, while the MSI Pro B840M-P Wi-Fi6E is a Micro-ATX at 243.8 × 243.8 mm. In practical terms, ATX opens up more room for expansion slots, better airflow routing, and greater headroom for large cooling solutions, whereas Micro-ATX trades that flexibility for a smaller chassis footprint — useful in compact or space-constrained builds.

The other meaningful differentiator is dual BIOS: the Asus board includes it, the MSI does not. Dual BIOS acts as a hardware-level safety net — if a firmware update goes wrong or the BIOS becomes corrupted, the board can recover automatically from a backup chip without user intervention. For builders who plan to update firmware or experiment with settings, this is a tangible reliability advantage. Overall, the Asus Prime B840-Plus WiFi holds a clear edge in this group: it offers a more expandable form factor and the added resilience of dual BIOS, with no trade-offs in connectivity or platform features compared to the MSI.

At a foundational level, these boards are well matched: both offer 4 memory slots, DDR5 support, and a dual-channel configuration. For most users, four slots is the sweet spot — it allows starting with two sticks and upgrading later without discarding existing modules, while dual-channel gives a meaningful bandwidth boost over single-channel setups.

Where the MSI Pro B840M-P Wi-Fi6E pulls ahead is in both capacity ceiling and overclocked speed headroom. Its 256 GB maximum versus the Asus Prime's 192 GB cap is largely academic for typical desktop use, but matters for memory-hungry workloads like large virtual machines, professional video editing timelines, or in-memory databases. More practically relevant is the overclocked RAM ceiling: the MSI supports up to 8000 MHz compared to the Asus's 7600 MHz. That 400 MHz gap translates to higher memory bandwidth when running fast DDR5 kits, which can produce noticeable gains in latency-sensitive applications and CPU-bound tasks where the processor is frequently waiting on memory.

Neither board supports ECC memory, so error-correcting workloads are off the table for both. On balance, the MSI Pro B840M-P Wi-Fi6E holds a clear edge in this category — it offers greater maximum capacity and a higher overclocked frequency ceiling, giving builders more room to scale their memory configuration over time.

Across the USB lineup, these two boards are effectively identical — both deliver the same mix of USB 3.2 Gen 2 (10 Gbps) and Gen 1 (5 Gbps) ports in both Type-A and Type-C configurations, plus four USB 2.0 ports for legacy peripherals. Neither board ventures into USB4 or Thunderbolt territory, which is expected at the B840 chipset level.

The one meaningful split comes down to video output. Both boards include HDMI and a single RJ45 ethernet port, but the Asus Prime B840-Plus WiFi adds a DisplayPort output that the MSI Pro B840M-P Wi-Fi6E simply lacks. That extra display connector matters more than it might initially seem — DisplayPort is the preferred interface for high-refresh-rate monitors, and having both HDMI and DisplayPort simultaneously allows driving two displays directly from the board's integrated output without a discrete GPU. For users relying on AMD's integrated graphics or wanting flexible multi-monitor options from the rear I/O, this is a practical, everyday advantage.

The verdict here goes to the Asus Prime B840-Plus WiFi. With all other port specs being equal, the addition of a DisplayPort output gives it a concrete edge for display flexibility — a gap that MSI does not close with anything elsewhere in this category.

Storage connectivity is nearly identical between these two boards — both provide 4 SATA 3 connectors for traditional drives and matching internal USB expansion headers. The more telling difference lies in M.2 sockets: the Asus Prime B840-Plus WiFi offers 3 versus the MSI Pro B840M-P Wi-Fi6E's 2. M.2 is the dominant interface for modern NVMe SSDs, and that extra slot on the Asus gives builders a meaningful path to expand fast storage without consuming any of the SATA ports — a genuine advantage for content creators, gamers with large libraries, or anyone planning a multi-drive NVMe setup from the outset.

Fan header count is the other differentiator worth noting. The Asus provides 6 fan headers to the MSI's 5. In practice, one additional header may seem minor, but in a well-cooled build with multiple case fans, a CPU cooler, and an AIO pump, that extra header can eliminate the need for a fan splitter or hub — keeping cable management cleaner and thermal control more granular. Both boards include a TPM connector, which is a baseline requirement for Windows 11 and enterprise security configurations.

The Asus Prime B840-Plus WiFi takes a clear edge in this category. The additional M.2 socket is the more impactful advantage — it directly expands high-speed storage scalability — and the extra fan header adds a secondary but practical benefit for thermal management in more complex builds.

Both boards share a single PCIe 4.0 x16 slot as their primary expansion lane — the slot where a discrete GPU will live in virtually every build. Neither board offers PCIe 5.0, which is consistent with the B840 chipset tier. For the vast majority of users installing a single graphics card, this shared foundation means equivalent GPU performance headroom on both boards.

Beyond that primary slot, the two boards diverge sharply. The Asus Prime B840-Plus WiFi adds 3 PCIe 3.0 x16 slots, while the MSI Pro B840M-P Wi-Fi6E replaces all of that with a single PCIe x1 slot. Those additional x16-sized slots on the Asus — even running at PCIe 3.0 speeds — are physically larger and electrically more capable, making them suitable for cards like capture cards, high-end network adapters, or other full-length expansion cards that a narrow x1 slot simply cannot accommodate. The MSI's x1 slot covers basic add-in cards but is limited in both physical size and bandwidth.

For expandability, the Asus Prime B840-Plus WiFi holds a decisive advantage. Three additional PCIe 3.0 x16 slots vastly broaden the range of compatible expansion cards, making it the stronger choice for users who anticipate adding specialized hardware beyond a primary GPU. The MSI's Micro-ATX form factor naturally constrains slot count, but the gap here is significant enough to be a real consideration.

Audio is a clean draw between these two boards. Both deliver 7.1-channel surround sound support through 3 analog audio connectors, and neither includes an S/PDIF optical output. The 7.1 channel capability covers the full range of surround sound configurations used in home theater and gaming setups, while three analog jacks is the standard arrangement for handling stereo, microphone, and line-in duties simultaneously.

The absence of S/PDIF on both boards means users who want to pipe lossless digital audio to an external DAC or AV receiver over optical will need to look at a dedicated sound card or USB DAC instead. That said, this is a common omission at this chipset tier and affects both boards equally, so it is not a differentiator — just a shared limitation to be aware of for audiophile or home-theater use cases.

This category is a tie. Every audio specification is identical across the Asus Prime B840-Plus WiFi and the MSI Pro B840M-P Wi-Fi6E, and neither holds any advantage here. Audio performance should not factor into the buying decision between these two boards.

RAID support is nearly identical across these two boards, with both handling RAID 0 (striping for speed), RAID 1 (mirroring for redundancy), and RAID 10 (a combined stripe-and-mirror array). For most desktop users, these three modes cover every practical use case — from performance-focused setups to basic data protection.

The single differentiator is RAID 5 support, which the Asus Prime B840-Plus WiFi includes and the MSI Pro B840M-P Wi-Fi6E does not. RAID 5 distributes parity data across three or more drives, delivering a balance of read performance, storage efficiency, and fault tolerance that RAID 1 and RAID 10 cannot match in terms of usable capacity per drive. It is particularly relevant in NAS-adjacent desktop workloads or small office environments where maximizing usable storage across multiple drives while retaining redundancy is a priority.

For the overwhelming majority of home users, this distinction will never surface — RAID 5 requires at least three drives and carries meaningful setup complexity. But for anyone specifically planning a multi-drive redundant array, the Asus Prime B840-Plus WiFi holds a narrow but clear edge by keeping that option open where the MSI does not.