Custom-built PCs can be a little tricky sometimes. You have to make your selection based on various factors such as size, power, compatibility, specifications, and much more. For example, the motherboard that you love might not support the architecture or generation of the processor, or it may be too large to fit in the PC case. For instance, motherboards are available in several size and form factors, and the motherboard selection shapes your selection of other PC components. Therefore, this article will discuss the difference between Micro ATX VS. Mini ITX VS. ATX to help you make an intelligent purchase.


Mini ITX: 170mm x 170mm or 6.7” x 6.7”

Micro ATX: 244mm x 244mm or 9.6” x 9.6”

ATX: 305mm x 244 mm or 12.0” x 9.6”

As you can see, ATX is the largest form factor that you can get in a motherboard. It requires a larger PC case, and the parts that fit in the motherboard are also comparatively larger. Similarly, Micro ATX motherboards are slightly smaller, followed by Mini ITX motherboards. The form factor that you choose will dictate which PC parts can fit in it and which ones are out of bounds.

ATX Motherboards

ATX Motherboards

ATX motherboards are the largest ones that you can buy from the market. The Advanced Technology extended or ATX motherboards provide more room to fit all your PC parts without blocking ventilation. For instance, an ATX motherboard has 4-slots of RAM that can support up to 128GBs of memory without any problem. Moreover, you get space to install up to six HDDs or SSDs along with NVMe slots to extend the storage space.

Furthermore, most ATX motherboards support either Crossfire (What is Crossfire), SLI, or both technologies for a dual-GPU setup. Another reason to choose an ATX motherboard is that it supports heavy Power Supply Units to ensure that your system never runs out of resources, even if you choose to overclock the system. You can find several other useful features in an ATX motherboard that will enhance your gaming or working experience. However, ATX motherboards are comparatively more expensive than others as they offer a lot in terms of performance and features.


  • More RAM slots
  • Dual GPU support
  • More room for storage devices
  • Better ventilation system


  • Relatively expensive than other options.
  • You need a large PC case to fit an ATX motherboard.

Micro ATX Motherboards

Micro ATX Motherboards

Micro ATX motherboards offer similar specifications to an ATX, except for a few differences. Its size is comparatively smaller than an ATX, mainly due to the lower number of PCIe slots. Moreover, most Micro ATX boards don’t come with built-in WIFI and soundcards. However, the best part is that their price is almost 40% lower than an ATX. So, if you want to build a budget gaming PC, a Micro ATX is the best possible option.

Previously, Micro ATX boards lacked the hardware required to support a multi GPU setup. However, modern Micro ATX motherboards provide this option with either Crossfire or Nvidia SLI support. You can install either an AMD or Intel processor in the motherboard as the architecture allows only one of them. Furthermore, the available four RAM slots provide enough room for up to 64 GB of memory, which is more than enough for a high-end gaming PC. Lastly, being a moderate board, it can be installed on any PC case unless you are building a compact computer.


  • Cheaper than ATX motherboard
  • Suitable for most PC cases
  • 64-GBs RAM
  • Up to six storage slots
  • deal for a budget gaming build


  • Some Micro ATX doesn’t support a multi GPU setup.
  • It isn’t suitable for intense overclocking.

Mini ITX Motherboards

Mini ITX Motherboards

Mini ITX motherboards have the smallest form factor in the market. These boards are suitable for people who want to build a compact or portable gaming PC that they can carry around wherever they go. However, the downside is that it offers only a limited space to fit all your PC hardware. For instance, a Mini ITX motherboard has only two RAM slots that support up to 32-GBs of RAM storage. Moreover, the number of SATA and NVMe slots is also limited, but you can tackle this problem by installing large storage HDDs and SSDs.

Another negative factor of a Mini ITX motherboard is that it only offers one PICe slot. So, a multi GPU system is impossible for your Mini ITX to build. Therefore, a compact Mini ITX gaming PC isn’t suitable for heavy-duty gaming, rendering, or overclocking. The Mini ITX motherboards are more expensive than a Micro ATX motherboard despite lower resources. The higher price is justified because it offers better technology and supports a higher generation of processors. However, you will need special PC parts for your ITX build as it doesn’t support typical hardware.

Related: Different Types of PC Cases


  • Compact size
  • Portable design
  • Advanced technology
  • Universally fits in all PC cases.
  • Useful features and modern look.
  • Suitable for casual gaming and entertainment


  • Expensive than Micro ATX
  • It isn’t suitable for heavy-duty gaming and overclocking.
  • Only two RAM slots

So, Which one is the Best Option?

All motherboard form factors have their pros and cons. So, it usually depends on your requirements, budget, and expectations from the PC. For instance, a Mini ITX motherboard offers less hardware compatibility, but it fits in all PC cases without any problem. Similarly, the Micro ATX motherboards are for medium PC builds that can be optimized to run most heavy games on your system. Similarly, the ATX motherboard is suitable for heavy-duty gaming, overclocking, and high-end PC builds.

Related: Best Open Air Pc Cases


The motherboard’s form factor greatly affects the type and size of hardware you can install. Each type of board has its advantages and disadvantages for various users. Therefore, it is best to understand the differences between these boards to build your PC successfully. This article discussed all the major differences between Micro ATX VS. Mini ITX VS. ATX motherboards; I hope it was helpful for you.

Meet Gabriel. He is 32 years old. He lives in New York, and gaming is his passion. He stepped into the field of gaming when he was 12. He spent most of his time playing games. His father often got angry because he did not focus much on his studies, but he thought of doing something in his gaming career. Inspired by his uncle Jamie, he started his own gaming website, and now he is a successful freelancer.