Both boards share the same AM5 socket, a single-CPU layout, HDMI 2.1 output, overclock support, dual BIOS, and a 3-year warranty, making their common foundation equally solid. The most immediate physical difference is form factor: the Gigabyte B840M Aorus Elite WiFi6E is a Micro-ATX board (244 × 244 mm), while the MSI Pro B840-P WiFi is a full ATX board (243.8 × 304.8 mm). This means the Gigabyte fits smaller cases and is the only realistic choice for a compact build, whereas the MSI demands a mid- or full-tower and in return offers more slot and expansion room.
On connectivity, both support Wi-Fi through Wi-Fi 6E, but the MSI goes one step further with Wi-Fi 7 (802.11be) support, which delivers significantly higher throughput and lower latency on compatible routers — a tangible future-proofing advantage. The MSI also edges ahead on Bluetooth, shipping with version 5.4 versus the Gigabyte's 5.3, a modest but real improvement in connection stability and energy efficiency for wireless peripherals.
In usability features, the MSI holds two additional advantages: it includes RGB lighting for users who care about aesthetics, and critically, it offers an easy BIOS reset mechanism that the Gigabyte lacks — a practical convenience during initial builds or troubleshooting. Overall, the MSI Pro B840-P WiFi has a clear general-info edge thanks to superior wireless standards, newer Bluetooth, and better build-time usability, provided you have the case space for an ATX footprint. The Gigabyte is the better pick only if a compact Micro-ATX form factor is a hard requirement.