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ASRock B450M/AC R2.0 AM4 AMD Promontory B450 SATA vs ASRock B550M-ITX/AC Supports 3rd Gen AMD AM4

Updated July 2026 — ASRock B450M/AC R2.0 AM4 AMD Promontory B450 SATA wins on compatibility, ASRock B550M-ITX/AC Supports 3rd Gen AMD AM4 wins on memory and audio.

The ASRock B550M-ITX/AC offers advanced features and better performance, making it the superior choice for high-end builds.

Why ASRock B450M/AC R2.0 AM4 AMD Promontory B450 SATA is better

Price

B450M/AC R2.0 is $30 cheaper

Compatibility

Supports a wider range of AMD processors

Size

Micro ATX offers better airflow

Why ASRock B550M-ITX/AC Supports 3rd Gen AMD AM4 is better

Memory Speed

Supports DDR4 up to 4733 MHz

Graphics Output

Includes both DisplayPort and HDMI

Audio Quality

Features 7.1 channel HD audio

Overall score

ASRock B450M/AC R2.0 AM4 AMD Promontory B450 SATA
75
ASRock B550M-ITX/AC Supports 3rd Gen AMD AM4
88

Specifications

SpecASRock B450M/AC R2.0 AM4 AMD Promontory B450 SATAASRock B550M-ITX/AC Supports 3rd Gen AMD AM4
Processor SupportRyzen 2000/3000/4000/50003rd Gen Ryzen
RAM SupportDDR4 3200DDR4 4733+
Form FactorMicro ATXMini ITX
Audio CodecStandardRealtek ALC887
Graphics OutputsHDMIDisplayPort, HDMI

Dimension comparison

ASRock B450M/AC R2.0 AM4 AMD Promontory B450 SATAASRock B550M-ITX/AC Supports 3rd Gen AMD AM4

Introduction to the ASRock Motherboards

When it comes to selecting a motherboard, the choice between the ASRock B450M/AC R2.0 and the ASRock B550M-ITX/AC can significantly impact your overall system performance. Both motherboards cater to AMD processors, yet they differ in terms of specifications, features, and pricing. The B450M/AC R2.0 is priced at $79.00, while the B550M-ITX/AC comes in at $109.99, making the latter about 39% more expensive. This article will delve into various aspects of both motherboards to help you make an informed decision.

Compatibility with AMD Processors

One of the key differences between the two motherboards lies in their processor compatibility. The ASRock B450M/AC R2.0 supports a wide range of AMD AM4 Socket processors, including Ryzen 2000, 3000, 4000 G-Series, and 5000 models. In contrast, the ASRock B550M-ITX/AC is designed for 3rd Gen AMD Ryzen processors and future AMD Ryzen models, but it notably does not support AMD Athlon processors. This makes the B450M/AC R2.0 more versatile for users looking to utilize older generation Ryzen chips.

Memory Support and Overclocking

When it comes to memory support, the ASRock B450M/AC R2.0 supports DDR4 RAM up to 3200 MHz, providing adequate performance for general use and gaming. On the other hand, the B550M-ITX/AC supports DDR4 RAM with an impressive speed of 4733 MHz (overclocked). This higher memory speed can lead to better performance in memory-intensive tasks and gaming. If overclocking is a priority for you, the B550M-ITX/AC presents a significant advantage.

Graphics Output Options

Graphics output is crucial for any gaming or high-performance PC build. The ASRock B450M/AC R2.0 features HDMI output, catering to users who may prefer a straightforward connection to monitors. In comparison, the B550M-ITX/AC offers both DisplayPort and HDMI outputs, providing more flexibility for multi-monitor setups or advanced display configurations. This makes the B550M-ITX/AC a more versatile choice for users who need diverse graphics output options.

Audio Capabilities

Audio quality can greatly affect the overall computing experience, especially for gamers and multimedia enthusiasts. The ASRock B450M/AC R2.0 does not specify its audio capabilities, which may indicate standard audio features. In contrast, the B550M-ITX/AC boasts a 7.1 channel HD audio system powered by the Realtek ALC887 audio codec. This feature enhances the audio experience, providing clearer sound and better surround sound capabilities, making it a better choice for audio-centric applications.

Form Factor and Size

The form factor of a motherboard can influence your overall build, especially in terms of space and compatibility with cases. The ASRock B450M/AC R2.0 is a Micro ATX motherboard, offering a balance of features and space efficiency. Meanwhile, the ASRock B550M-ITX/AC is a Mini ITX motherboard, which is smaller and ideal for compact builds. If space is a premium or you are considering a small form factor PC, the B550M-ITX/AC may be the better option.

Pricing and Value for Money

In terms of pricing, the ASRock B450M/AC R2.0 is currently available for $79.00, while the ASRock B550M-ITX/AC is priced at $109.99. This represents a price difference of about $30, with the B450M/AC R2.0 being around 39% cheaper. For budget-conscious consumers or those who do not require the latest features, the B450M/AC R2.0 provides excellent value for money. Conversely, the B550M-ITX/AC’s higher price might be justified for users who need its advanced features and performance capabilities.

User Experience and Installation

User experience can vary significantly depending on the motherboard's design and installation process. Both motherboards from ASRock are generally well-reviewed for their ease of installation. However, the Mini ITX form factor of the B550M-ITX/AC may pose a challenge for users who are not accustomed to working with smaller components. The B450M/AC R2.0's Micro ATX size allows for better airflow and easier access to components, making it more user-friendly for beginners.

Which should you buy?

Deciding between the ASRock B450M/AC R2.0 and the ASRock B550M-ITX/AC ultimately depends on your specific needs and budget. If you are looking for a more budget-friendly option that supports a broad range of AMD processors, the B450M/AC R2.0 is a solid choice. However, if you require higher memory speeds, advanced graphics output options, and superior audio capabilities, the B550M-ITX/AC is worth the extra investment.