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ASUS Prime B840-PLUS WiFi AMD AM5 B840 ATX Motherboard vs GIGABYTE B550M K

Updated August 2026The ASUS Prime B840-PLUS WiFi offers superior features and future-proofing compared to the GIGABYTE B550M K, making it the better choice for high-performance builds.

The ASUS Prime B840-PLUS WiFi offers superior features and future-proofing compared to the GIGABYTE B550M K, making it the better choice for high-performance builds.

Why ASUS Prime B840-PLUS WiFi AMD AM5 B840 ATX Motherboard is better

Price

ASUS is cheaper at C$153.44

Memory Support

Supports DDR5 for better performance

Connectivity

Includes Wi-Fi 6E and more USB ports

Why GIGABYTE B550M K is better

Processor Compatibility

Supports older AMD Ryzen processors

Power Design

Sturdy 4+2 Phases Digital Twin Power Design

Cooling Features

Smart Fan 5 for efficient cooling management

Overall score

ASUS Prime B840-PLUS WiFi AMD AM5 B840 ATX Motherboard
85
GIGABYTE B550M K
72

Specifications

SpecASUS Prime B840-PLUS WiFi AMD AM5 B840 ATX MotherboardGIGABYTE B550M K
SocketAM5AM4
Memory TypeDDR5DDR4
Wi-Fi6ENo
M.2 Slots32
RGB SupportAura SyncRGB FUSION 2.0

Dimension comparison

ASUS Prime B840-PLUS WiFi AMD AM5 B840 ATX MotherboardGIGABYTE B550M K

Overview of ASUS Prime B840-PLUS WiFi and GIGABYTE B550M K

The ASUS Prime B840-PLUS WiFi is priced at C$153.44, while the GIGABYTE B550M K is available for C$183.79. The price difference indicates that the ASUS model may offer a more budget-friendly option, especially for users seeking advanced features for AI computing. Both motherboards cater to different processor generations, with the ASUS supporting the latest AMD AM5 socket and the GIGABYTE geared towards the AMD AM4 socket, making them suitable for different user requirements.

Processor Compatibility

The ASUS Prime B840-PLUS WiFi is designed for AMD Ryzen 9000, 8000, and 7000 Series Desktop Processors, providing flexibility for users who want to build a high-performance system. In contrast, the GIGABYTE B550M K supports a variety of AMD Ryzen processors, including the 5000 Series, 5000 G-Series, 4000 G-Series, and 3000 Series. This broad compatibility with older processors makes the GIGABYTE motherboard a viable choice for users looking to upgrade their existing systems without changing their CPU.

Power Delivery and Design

In terms of power delivery, the ASUS Prime B840-PLUS WiFi features an enhanced power solution with a 6-layer PCB, alloy chokes, and durable capacitors, ensuring stable performance under demanding workloads. The GIGABYTE B550M K, on the other hand, utilises a 4+2 Phases Digital Twin Power Design with Low RDS(on) MOSFETs, which also aims to provide robust power management. While both designs focus on stability, the ASUS motherboard offers a more advanced structural layout, which is particularly beneficial for users who plan to push their systems to the limit.

Connectivity Options

Connectivity is a strong point for the ASUS Prime B840-PLUS WiFi, featuring Wi-Fi 6E, PCIe 4.0 x16 slot, and multiple PCIe 4.0 M.2 slots, ensuring ultrafast data transfer and network speeds. Additionally, it includes Realtek 2.5Gb Ethernet and rear USB 10Gbps Type-A and Type-C ports. The GIGABYTE B550M K also supports PCIe 4.0 with dual ultra-fast NVMe PCIe 4.0/3.0 x4 M.2 connectors and Realtek GbE LAN chip, but it lacks the advanced wireless capabilities of the ASUS board. For users prioritising connectivity, the ASUS model clearly stands out.

Memory Support

The ASUS Prime B840-PLUS WiFi supports DDR5 memory, which is the latest standard offering higher speeds and better performance compared to DDR4. This makes it future-proof for upcoming applications and demanding tasks. Conversely, the GIGABYTE B550M K is compatible with DDR4 memory, supporting dual-channel ECC/non-ECC unbuffered options. While DDR4 is still prevalent and sufficient for many users, the ability of the ASUS motherboard to accommodate DDR5 provides a significant advantage for those looking to maximise their system’s potential.

Cooling Solutions

Cooling is crucial for maintaining optimal performance, and both motherboards have features designed to manage heat. The ASUS Prime B840-PLUS WiFi includes comprehensive cooling solutions such as VRM and M.2 heatsinks, PCH heatsink, hybrid fan headers, and Fan Xpert 2+ software for enhanced control. The GIGABYTE B550M K also offers smart fan features through Smart Fan 5 and includes Q-Flash Plus for BIOS updates. However, the more extensive cooling design of the ASUS board makes it better suited for high-performance builds, particularly those that may run intensive applications.

Personalisation Features

For users who enjoy customising their builds, the ASUS Prime B840-PLUS WiFi excels with three addressable Gen 2 headers, all configurable with ASUS-exclusive Aura Sync RGB lighting. This provides users with vibrant lighting options to match their aesthetic preferences. The GIGABYTE B550M K features RGB FUSION 2.0, which allows for the connection of addressable LED and RGB LED strips, but it may not offer the same level of customisation as the ASUS model. For those who prioritise aesthetics in their PC builds, the ASUS motherboard provides more options.

Which should you buy?

Choosing between the ASUS Prime B840-PLUS WiFi and the GIGABYTE B550M K ultimately depends on your specific needs. If you are looking for a motherboard that supports the latest AMD processors, offers superior connectivity, and features advanced cooling and personalisation options, the ASUS Prime B840-PLUS WiFi is the clear winner at C$153.44. However, if you are upgrading an existing system and are satisfied with a solid performance for a lower cost, the GIGABYTE B550M K at C$183.79 may still be a suitable choice, particularly for those using older generation AMD processors. Overall, the ASUS Prime B840-PLUS WiFi stands out for its future-proofing and advanced features, making it a better investment for high-performance computing.

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