ASRock B550M-ITX/AC Supports 3rd Gen AMD AM4 vs ASRock B850M-X WiFi R2.0 AM5 Micro-ATX
Updated August 2026 — ASRock B550M-ITX/AC Supports 3rd Gen AMD AM4 wins on size, ASRock B850M-X WiFi R2.0 AM5 Micro-ATX wins on connectivity and memory.
The ASRock B850M-X WiFi R2.0 offers advanced features and future-proofing, making it the better choice for modern builds. However, the B550M-ITX/AC is a solid budget option.
Why ASRock B550M-ITX/AC Supports 3rd Gen AMD AM4 is better
Price
B550M-ITX/AC is $20 cheaper
Size
B550M-ITX/AC is more compact (Mini ITX)
Compatibility
B550M-ITX/AC supports a wider range of AM4 processors
Why ASRock B850M-X WiFi R2.0 AM5 Micro-ATX is better
Future-proofing
B850M-X supports AM5 and newer Ryzen CPUs
Memory Speed
B850M-X supports DDR5 up to 8200+ MHz
Connectivity
B850M-X includes Wi-Fi 6E and USB-C
Overall score
Specifications
| Spec | ASRock B550M-ITX/AC Supports 3rd Gen AMD AM4 | ASRock B850M-X WiFi R2.0 AM5 Micro-ATX |
|---|---|---|
| Socket | AM4 | AM5 |
| Memory Type | DDR4 | DDR5 |
| Max Memory Speed | 4733+ MHz | 8200+ MHz |
| Form Factor | Mini ITX | Micro ATX |
| Wi-Fi | No | Yes |
Dimension comparison
Overview of the Products
In this comparison, we are looking at the ASRock B550M-ITX/AC and the ASRock B850M-X WiFi R2.0 motherboards. The B550M-ITX/AC is currently priced at $109.99, while the B850M-X WiFi R2.0 comes in at $129.99, making the B550M-ITX/AC about 17% cheaper. Both motherboards target different segments of the market, with the B550M-ITX/AC focusing on AMD's AM4 socket processors and the B850M-X WiFi R2.0 catering to the newer AM5 socket.
Compatibility with Processors
The ASRock B550M-ITX/AC is designed to support AMD's AM4 socket, accommodating a wide range of processors including the Ryzen 3000, 4000, and 5000 series. This versatility makes it a great choice for users looking to build or upgrade a system based on these proven processors. On the other hand, the B850M-X WiFi R2.0 supports the latest AMD Ryzen 9000, 8000, and 7000 series CPUs, which means it is better suited for those seeking to future-proof their builds with cutting-edge technology.
Memory Support
When it comes to memory, the ASRock B550M-ITX/AC supports DDR4 memory with speeds of up to 4733+ MHz (overclocked). This allows for decent performance and smooth multitasking capabilities, particularly for gaming and content creation. In contrast, the B850M-X WiFi R2.0 takes memory performance up a notch by supporting DDR5 memory up to 8200+ MHz (overclocked). This higher memory speed can lead to significant improvements in overall system responsiveness and performance, especially for memory-intensive applications.
Form Factor and Design
The ASRock B550M-ITX/AC features a Mini ITX form factor, which is ideal for compact builds where space is a premium. This small size allows for a more portable setup, making it suitable for mini PCs or home theater systems. Meanwhile, the ASRock B850M-X WiFi R2.0 adopts a Micro-ATX form factor, providing more expansion options such as additional PCIe slots and RAM slots. This makes the B850M-X a better option for users who may want to add more components in the future or prefer a more robust build.
Graphics Output
For graphics output, the ASRock B550M-ITX/AC offers both HDMI and DisplayPort options, allowing for flexibility in connecting to various displays. This is particularly useful for users who may use multiple monitors or high-resolution displays. Similarly, the B850M-X WiFi R2.0 also includes HDMI and DisplayPort outputs, providing comparable versatility. Both motherboards support high-definition audio, ensuring users have a solid multimedia experience.
Connectivity Options
In terms of connectivity, the B550M-ITX/AC provides standard options but lacks some of the latest technologies. The B850M-X WiFi R2.0, however, excels in this area with its inclusion of Wi-Fi 6E and 2.5G LAN, ensuring faster and more reliable internet connections. Additionally, it features USB-C connectivity, which is becoming increasingly important for modern peripherals. This makes the B850M-X a more attractive choice for users who require high-speed data transfers and enhanced wireless capabilities.
Power Delivery and Efficiency
The ASRock B550M-ITX/AC is built with sturdy components, ensuring smooth power delivery to the CPU and allowing for efficient performance. However, the B850M-X WiFi R2.0 takes power management to another level with its 6+1+1 phase power design and Dr.MOS technology, which can provide more stable power for overclocking. This would be particularly beneficial for power users aiming for maximum performance from their processors.
Price Comparison
With the ASRock B550M-ITX/AC priced at $109.99 and the ASRock B850M-X WiFi R2.0 at $129.99, the latter comes at an additional cost of $20. While the B550M-ITX/AC is about 17% cheaper, the price difference can be justified by the advanced features and future-proofing that the B850M-X offers. For users on a budget, the B550M-ITX/AC provides excellent value, while the B850M-X is aimed at those willing to invest in the latest technology.
Which should you buy?
Choosing between the ASRock B550M-ITX/AC and the ASRock B850M-X WiFi R2.0 ultimately depends on your needs and budget. If you're looking for a cost-effective solution for AMD's AM4 processors and don't require the latest features, the B550M-ITX/AC is a solid choice. Alternatively, if you want future-proofing and the latest compatibility with Ryzen 9000, 8000, and 7000 series CPUs, the B850M-X WiFi R2.0 is worth the extra investment. Both motherboards have their strengths, but the right choice will depend on how you plan to use your system.

