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Difference between ATX and Micro ATX

Difference between ATX and Micro ATX

There are many different types of computer cases on the market, and it can be confusing to figure out which one you need. In this blog post, we will compare ATX and micro ATX cases and discuss the pros and cons of each. We hope this information will help you make a decision about which case is right for you.

What is ATX?

ATX is a motherboard form factor developed by Intel in 1995. It was the successor to the AT form factor, and it is still used today.

  • ATX boards are usually larger than other form factors, and they typically have more expansion slots. ATX boards also have a connection for a 20-pin ATX power supply.
  • This power supply provides 3.3 volts, 5 volts, and 12 volts to the board, which is used to power the processor, memory, and other components. In addition, ATX boards typically have a 4-pin connector for an ATX 12V power supply.
  • This power supply provides additional power to the processor and helps to improve stability. ATX is a widely used form factor, and it is supported by a large number of manufacturers.

What is Micro ATX?

Micro ATX is a type of motherboard that is smaller than a traditional ATX motherboard.

  • Micro ATX motherboards are typically 9.6 inches square, while traditional ATX motherboards are 12 inches square.
  • Micro ATX motherboards can have fewer expansion slots than traditional ATX motherboards, but they can still support standard PC components such as processors, memory, and hard drives. Micro ATX motherboards are popular in small form factor PCs, such as mini towers and home theater PCs.
  • Some manufacturers also offer Micro ATX versions of their traditional ATX motherboard designs. Micro ATX is not an official standard, but it is supported by major motherboard manufacturers.

Difference between ATX and Micro ATX

ATX and Micro ATX are two types of form factors for motherboards.

  • The ATX form factor is the most common form factor, and it has been the standard since 1995.
  • ATX is a 12″x9.6″ Rectangle, with a mount hole pattern of 6.7″x6.1″.
  • ATX boards usually have more than 7 slots and may have up to 10.
  • Micro ATX was introduced in 1997, as a smaller alternative to ATX.
  • Micro ATX is a 9.6″x9.6″ square, with a mount hole pattern of 6.7″x6.1″.
  • Micro ATX boards usually have 4 or fewer slots.
  • Both ATX and Micro ATX use the same placement for mounting holes, so they are compatible with each other.

The main difference between ATX and Micro ATX is size, which allows for different numbers of expansion slots on the motherboard.


If you are in the market for a new computer case, it is important to understand the difference between ATX and Micro ATX cases. The two formats have different dimensions and shapes, so it is crucial to select the right case for your needs. We hope this article has helped you better understand the differences between ATX and Micro ATX cases and that you are now able to make an informed decision when purchasing a new case.

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