Are All Motherboards The Same Size? – Choose The Right One For Your PC Build!

Motherboards come in various sizes, known as form factors. Standard form factors include ATX, Micro-ATX, Mini-ITX, and more. Each with distinct dimensions and features to suit different PC build requirements. 

This article aims to shed light on the fascinating world of motherboard form factors. By the end of this piece, readers will grasp the importance of selecting the right motherboard size. They will also gain the knowledge needed to make informed choices when embarking on their next PC-building journey.

Understanding Motherboard Form Factors – Get Knowledge about Size, Uses, and Key Features:

Motherboard form factors refer to standardized specifications that determine a motherboard’s physical size, shape, and layout. These specifications are crucial as they dictate the compatibility of motherboards with computer cases and the components they can accommodate. 

Understanding Motherboard Form Factors
source: beebom

Understanding these form factors is essential for building or upgrading a PC. Let’s take a look at the different form factors of motherboards and their key features.

ATX (Advanced Technology Extended) Motherboard:

ATX motherboards are the most prevalent and measure approximately 12 x 9.6 inches (30.5 x 24.4 cm). They offer numerous expansion slots,  great RAM and GPU options, and robust connectivity. ATX motherboards are versatile and ideal for desktops, gaming PCs, and workstations. 

Micro-ATX (mATX) Motherboard:

Micro-ATX motherboards are minor, at about 9.6 x 9.6 inches (24.4 x 24.4 cm). They balance size and features, making them suitable for compact desktop cases.

mATX is often used in budget-friendly desktops and compact gaming rigs. Micro-ATX provides a decent balance between size and parts with fewer slots than ATX.

Mini-ITX Motherboard:

Mini-ITX motherboards are more petite, around 6.7 x 6.7 inches (17 x 17 cm). Designed for ultra-compact PCs, they offer limited expansion.

Mini-ITX is perfect for small form factor PCs, HTPCs (Home Theater PCs), and portable gaming systems. They offer limited expansion options but are space-efficient; typically one PCIe slot and two RAM slots.

Extended ATX (E-ATX) Motherboard:

E-ATX motherboards are larger than ATX, typically 12 x 13 inches (30.5 x 33 cm). They cater to high-end systems with additional features and ample space for multiple components. E-ATX suits enthusiasts and gamers who need extra features and play with various GPUs, RAM, and storage.

Extended ATX (E-ATX) Motherboard
source: geekawhat

Mini-STX and Nano-STX Motherboards:

Mini-STX boards measure 5.8 x 5.8 inches (14.8 x 14.8 cm), while Nano-STX is smaller at 4.5 x 4.5 inches (11.4 x 11.4 cm). These little form factors are ideal for ultra-compact desktops, embedded systems, and media centers. They provide minimal expansion options suitable for basic computing needs.

Motherboards’ Compatibility Considerations – Don’t Miss Out These Points!

Compatibility considerations are paramount when selecting a motherboard. A compatible motherboard ensures physical fit, harmonious integration with other components, proper cooling, and efficient power delivery.

The Importance of Matching the Motherboard with the Case:

Selecting a compatible motherboard size for your computer case is crucial. A mismatch can lead to installation problems, improper fit, and obstructed ports. If your case supports an ATX motherboard, choosing a smaller mATX or Mini-ITX board will only work with additional modifications or adapters.

CPU, RAM, and GPU Compatibility:

Compatibility extends beyond the physical fit. You must ensure the motherboard is compatible with your GPU, CPU, and RAM modules. Check the motherboard’s socket type for CPU compatibility, RAM slots for RAM compatibility, and PCIe slots for GPU compatibility.

CPU, RAM, and GPU Compatibility

Also, verify that the motherboard supports the required generation of components (e.g., DDR4 RAM).

Cooling Solutions and Power Requirements:

Different motherboard form factors may have varying cooling solutions and power requirements. Larger motherboards like ATX and E-ATX can accommodate more extensive cooling setups and power delivery systems.

Smaller Mini-ITX boards might have limited space for cooling, potentially affecting CPU temperatures and overclocking capabilities. Ensure your motherboard meets your cooling and power demands, especially for gaming or high-performance computing.

The Role of the I/O Shield and Port Placement:

The I/O shield, a metal plate covering the motherboard’s rear ports, is specific to each form factor. When changing motherboards, you may need to replace the I/O shield to align with the new board’s port placement. 

Port placement is also essential for cable management and aesthetics. Ensure that the motherboard’s port layout matches your case’s cable management options. 

Selecting the Right Motherboard Size – Building the Right System:

Building the right system involves thoughtful consideration of motherboard size and case selection, expansion options, and future-proofing. You can create a balanced and efficient PC build that suits your needs and budget by carefully evaluating your requirements and priorities.

Selecting the Right Motherboard Size
source: digitaltrends

Tips for Selecting the Appropriate Motherboard:

When choosing a motherboard size, consider your specific needs. If you plan to build a compact PC or have limited space, opt for Mini-ITX or Micro-ATX motherboards. 

For a high-performance system with multiple components, go for ATX or E-ATX. Carefully assess your desired elements and their fit within the chosen motherboard size.

Case Selection and Its Impact on the Build:

The case you select has a significant impact on your build. Ensure it accommodates the motherboard size and offers ample space for components, cable management, and cooling. 

A well-ventilated case with good airflow can enhance system performance, while cable management features make your build neater and more efficient.

Balancing Expansion Options with Space Constraints:

It’s crucial to strike a balance between expansion options and space constraints. Smaller motherboards like Mini-ITX may have fewer PCIe slots and RAM slots, limiting future upgrades. 

Balancing Expansion Options with Space Constraints

Conversely, larger motherboards offer more expansion but require roomy cases. Evaluate your current needs and potential future upgrades to make an informed decision.

Future-Proofing Considerations:

Consider future-proofing when selecting a motherboard. Invest in a motherboard that supports the latest CPU socket and chipset technologies to ensure compatibility with upcoming CPUs and features. 

Ensure it has enough RAM slots and PCIe slots for future expansion. Additionally, check for the latest connectivity options like USB-C and Wi-Fi support.

Types of Specialized Motherboards – Explore the Unique Varieties Today!

Server Motherboards and Their Unique Features:

Server motherboards are designed for hosting applications, data storage, and heavy workloads. They possess several distinctive features, including support for multiple CPUs, ECC (Error-Correcting Code) memory for data integrity, and advanced RAID controllers for storage redundancy. 

These motherboards often offer remote management capabilities, allowing administrators to monitor and manage servers remotely. 

Industrial and Embedded System Motherboards:

Industrial and embedded system motherboards are tailored for specialized applications in rugged environments. They are designed to endure severe temperature variations, impact, and mechanical stress.

Industrial and Embedded System Motherboards
source: dusuniot

These features make them suitable for manufacturing plants, medical equipment, and outdoor installations. These motherboards may have unique form factors and features, such as fanless cooling solutions, wide temperature ranges, and extended lifecycle support.

Gaming Motherboards and Enthusiast Options:

Gaming motherboards are designed with features that cater to the needs of gamers and enthusiasts. They often support overclocking capabilities and multiple high-speed PCIe slots.

Gaming Motherboards also provide solutions for multi-GPU setups and advanced audio support for immersive gaming experiences. Gaming motherboards also feature RGB lighting and customizable aesthetics. 

Famous Motherboard series:


  • ASUS ROG (Republic of Gamers)
  • ASUS TUF (The Ultimate Force)
  • ASUS Prime
  • ASUS ROG Strix


  • GIGABYTE Gaming
  • GIGABYTE Ultra Durable
  • GIGABYTE Designare

MSI (Micro-Star International):

  • MSI MPG (MSI Performance Gaming)
  • MSI MAG (MSI Arsenal Gaming)
  • MSI MEG (MSI Enthusiast Gaming)


  • ASRock Taichi
  • ASRock Phantom Gaming
  • ASRock Steel Legend
  • ASRock Pro


  • EVGA Z-series
  • EVGA FTW (For The Win)


  • Biostar Racing


  • Supermicro X10
  • Supermicro X11


  • Intel Desktop Boards (e.g., Intel DZ87KLT-75K)


AMD does not manufacture motherboards but works with partners like ASUS, GIGABYTE, MSI, ASRock, and others to produce motherboards compatible with AMD CPUs.


3. What factors should I consider when choosing a motherboard size?

Consider your PC case’s compatibility, available space, the number of components you plan to use, and your performance needs when selecting a motherboard size.

2. Can I use a smaller motherboard in a larger case?

Yes, you can use a smaller motherboard in a larger case, but you may have unused space. However, it’s essential to ensure that mounting holes and ports align correctly.

1. What are the advantages of choosing a Mini-ITX motherboard?

Mini-ITX motherboards are compact and space-saving, ideal for HTPCs. They are energy-efficient and great for building a portable or minimalist PC.


Motherboards are not all the same size; they come in various form factors, each designed for specific needs. The size of your motherboard greatly impacts your PC’s capabilities and compatibility.

It’s essential to choose the right motherboard size, considering your case, component compatibility, cooling, and future needs.