ASUS ROG STRIX B860-I GAMING WIFI B860 LGA 1851 mITX Mini-ITX motherboard vs ASUS Prime B840-PLUS WiFi AMD AM5 B840 ATX Motherboard

Design and Form Factor

The ASUS ROG STRIX B860-I GAMING WIFI is a Mini-ITX motherboard, while the ASUS Prime B840-PLUS WiFi is an ATX motherboard, reflecting their different target builds and space requirements. The B860-I Gaming WiFi’s Mini-ITX form factor suits compact, space-saving systems, ideal for small builds without sacrificing high-end features. This motherboard supports the Intel LGA 1851 socket designed for Intel Core Ultra processors, highlighting its focus on Intel platforms.

Conversely, the Prime B840-PLUS WiFi uses the larger ATX form factor, catering to standard desktop builds with more expansion options. It supports the AMD AM5 socket for Ryzen 7000, 8000, and 9000 series processors, targeting AMD users. The ATX layout offers more room for additional components and potentially better cooling solutions. The design difference also affects price, with the Mini-ITX B860-I Gaming WiFi costing C$294.98, almost double the C$153.44 price of the ATX Prime B840-PLUS WiFi.

Processor Compatibility and Platform

Processor compatibility is a key differentiator: the ASUS ROG STRIX B860-I GAMING WIFI supports Intel’s LGA 1851 socket, ready for Intel Core Ultra processors from the second series. This motherboard is designed with future AI computing workloads in mind, optimising performance for Intel’s latest CPU generation. Its exclusive AI and memory technologies such as ASUS AI Advisor and ASUS-exclusive AI Networking II also enhance the experience on Intel platforms.

Meanwhile, the ASUS Prime B840-PLUS WiFi supports AMD’s AM5 socket, compatible with Ryzen 7000, 8000, and 9000 series desktop processors. This makes it suitable for users invested in AMD’s latest desktop CPUs. Both motherboards are positioned for advanced AI computing, but their CPU platform choice is critical: Intel LGA 1851 for the B860-I Gaming WiFi and AMD AM5 for the Prime B840-PLUS WiFi.

Power Delivery and Stability

The ASUS ROG STRIX B860-I GAMING WIFI features a highly robust power solution with a 10(80A)+1(80A)+2(80A)+1(80A) power stage configuration, using ProCool power connectors, MicroFine alloy chokes, and premium metallic capacitors. This advanced power delivery system ensures stable and efficient power for demanding Intel processors, supporting high performance and overclocking potential.

In comparison, the ASUS Prime B840-PLUS WiFi has an enhanced power solution based on a 6-layer PCB, alloy chokes, and durable capacitors. While solid and stable, it is less complex than the B860-I Gaming WiFi’s power design. This difference reflects the B860-I Gaming WiFi’s focus on high-end Intel CPUs and AI workloads, whereas the Prime B840-PLUS WiFi provides sufficient but more modest power delivery for AMD Ryzen processors.

Connectivity Features

Connectivity is a standout area for the ASUS ROG STRIX B860-I GAMING WIFI. It boasts one Thunderbolt 4 USB Type-C port, a USB 20Gbps connector, two USB 10Gbps ports, and full PCIe 5.0 x16 SafeSlot support for next-generation graphics cards. Networking is also advanced with Wi-Fi 7 (802.11be) and Intel 2.5 Gb Ethernet. The motherboard supports two onboard PCIe 5.0 M.2 slots, one cooled by a large heatsink to maximise storage performance.

The ASUS Prime B840-PLUS WiFi, while well-equipped, offers slightly lower-tier connectivity. It supports Wi-Fi 6E, Realtek 2.5Gb Ethernet, PCIe 4.0 x16 slot, and PCIe 4.0 M.2 slots. Rear USB includes 10Gbps Type-A and Type-C ports, with front panel USB 5Gbps Type-C support. Although ample for most uses, it lacks Thunderbolt 4 and PCIe 5.0, placing it a step behind the B860-I Gaming WiFi in raw connectivity and future-proofing.

Cooling and Thermal Design

Thermal management on the ASUS ROG STRIX B860-I GAMING WIFI is optimised with massive heatsinks integrated with the I/O cover, high-conductivity thermal pads, and an L-shaped heatpipe to effectively dissipate heat. This design supports the power-hungry Intel platforms and PCIe 5.0 components, ensuring sustained performance under load.

The ASUS Prime B840-PLUS WiFi offers comprehensive cooling with VRM and M.2 heatsinks, PCH heatsink, hybrid fan headers, and Fan Xpert 2+ software for fan control. While effective for an ATX motherboard targeting AMD Ryzen processors, it does not include the same extensive heatpipe or integrated I/O cooling system found on the B860-I Gaming WiFi. The B860-I’s compact build benefits from its advanced thermal design tailored for intense workloads in confined spaces.

Audio and Aesthetic Features

Audio capabilities on the ASUS ROG STRIX B860-I GAMING WIFI are designed for immersive experiences, incorporating the ROG SupremeFX ALC1220P codec paired with a Savitech SV3H712 amplifier and Dolby Atmos support. This setup targets gamers and content creators seeking premium sound quality.

The ASUS Prime B840-PLUS WiFi does not specify audio codecs or enhancements in the provided data but highlights unmatched personalisation with three Addressable Gen 2 headers configurable with ASUS-exclusive Aura Sync RGB lighting. It also offers renowned ASUS software like Armoury Crate and ASUS DriverHub for system customisation. While the Prime B840-PLUS WiFi excels in RGB control and software integration, the B860-I Gaming WiFi focuses more on high-end audio quality.

Price and Value

Price is a significant factor: the ASUS ROG STRIX B860-I GAMING WIFI is priced at C$294.98, nearly double the C$153.44 price of the ASUS Prime B840-PLUS WiFi. This price difference reflects the B860-I Gaming WiFi’s premium features such as PCIe 5.0 support, Thunderbolt 4, Wi-Fi 7, advanced power stages, and compact Mini-ITX design.

The Prime B840-PLUS WiFi offers strong value for users seeking a stable AMD AM5 motherboard with DDR5 support, PCIe 4.0 slots, Wi-Fi 6E, and solid cooling at a more affordable price. Users on a budget or those building standard ATX AMD systems may find the Prime B840-PLUS WiFi more cost-effective, while those wanting cutting-edge Intel performance and connectivity might justify the higher cost of the B860-I Gaming WiFi.

Which should you buy?

Choosing between the ASUS ROG STRIX B860-I GAMING WIFI and the ASUS Prime B840-PLUS WiFi depends primarily on platform preference, form factor, and budget. If you are building a compact Mini-ITX Intel system with the latest Intel Core Ultra processors and desire top-tier connectivity, PCIe 5.0, Thunderbolt 4, and Wi-Fi 7, the B860-I Gaming WiFi is the better choice despite its higher price of C$294.98.

Alternatively, if you prefer an AMD Ryzen build on the AM5 platform with a traditional ATX layout, solid DDR5 support, Wi-Fi 6E, and PCIe 4.0 connectivity at a more affordable price of C$153.44, the Prime B840-PLUS WiFi delivers excellent value. Both motherboards are designed for advanced AI computing and DIY-friendly features, but your choice should align with your CPU platform and budget priorities.