What is the Difference Between ATX and Micro-ATX Motherboard

When building or upgrading a computer, choosing the right motherboard is crucial. Two popular motherboard form factors are ATX and Micro-ATX. Understanding the differences between these two can help you make an informed decision that best suits your needs.

What is the Difference Between ATX and Micro-ATX Motherboards

Overview of ATX and Micro-ATX 

ATX Motherboards 

ATX, or Advanced Technology eXtended, is a standard motherboard size introduced by Intel in 1995. ATX motherboards measure 12 x 9.6 inches (305 x 244 mm) and are known for their versatility and expandability. They are widely used in gaming rigs, high-performance desktops, and workstations due to their ample space for components and expansion slots.

Micro-ATX Motherboards 

Micro-ATX, or mATX, is a smaller variant of the ATX form factor. Measuring 9.6 x 9.6 inches (244 x 244 mm), Micro-ATX motherboards are designed to fit in smaller cases while still providing a decent level of functionality. They offer a balance between size and expandability, making them popular for budget builds, compact desktops, and home theater PCs (HTPCs).

Size and Form Factor 

Physical Dimensions 

The primary difference between ATX and Micro-ATX motherboards is their size. ATX motherboards are larger, providing more space for additional components and expansion slots. In contrast, Micro-ATX motherboards are more compact, making them suitable for smaller cases and tighter spaces.


Due to their larger size, ATX motherboards require larger cases, which can accommodate more cooling options and larger power supplies. Micro-ATX motherboards can fit into both Micro-ATX and ATX cases, offering greater flexibility for those who might want to upgrade to an ATX motherboard in the future.

Expansion Slots and Ports 

Expansion Slots 

ATX motherboards typically come with more expansion slots compared to Micro-ATX motherboards. An ATX motherboard can have up to seven PCIe slots, while a Micro-ATX motherboard usually has four. This difference means ATX motherboards can support more graphics cards, sound cards, and other peripherals, making them ideal for high-end gaming and professional workstations.

Connectivity Ports 

Both ATX and Micro-ATX motherboards offer a variety of connectivity ports, but the number and type of ports can vary. ATX motherboards often have more USB ports, SATA connectors, and other interfaces due to their larger size, allowing for greater connectivity and flexibility in building a comprehensive system.

Performance and Features 

Power Delivery 

ATX motherboards generally have more robust power delivery systems compared to Micro-ATX motherboards. This means they can support more powerful CPUs and offer better stability and overclocking potential. While Micro-ATX motherboards can still provide adequate power for most users, high-performance enthusiasts might prefer ATX for its superior power handling capabilities.

Cooling Solutions 

Larger ATX motherboards offer more space for advanced cooling solutions, including larger heatsinks, more case fans, and even custom liquid cooling loops. This makes them better suited for high-performance builds that generate more heat. Micro-ATX motherboards, while still offering adequate cooling options, may have limited space for the most advanced cooling setups.

Cost Considerations 

Price Differences 

In general, ATX motherboards tend to be more expensive than Micro-ATX motherboards. This is due to their larger size, increased number of components, and greater expandability. For budget-conscious builders, a Micro-ATX motherboard can offer a cost-effective solution without sacrificing too much in terms of performance and features.

Value for Money 

While ATX motherboards provide more features and expandability, Micro-ATX motherboards often offer better value for money, especially for users who do not need the extra expansion slots or advanced cooling solutions. For mainstream users, casual gamers, and office environments, a Micro-ATX motherboard can provide all the necessary features at a lower cost.


Choosing the Right Motherboard 

The decision between ATX and Micro-ATX motherboards ultimately comes down to your specific needs and preferences. If you require maximum expandability, advanced cooling options, and robust power delivery, an ATX motherboard is the better choice. However, if you are looking for a more compact, budget-friendly solution that still offers a good range of features, a Micro-ATX motherboard might be the ideal option.

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