ATX vs Micro ATX vs Mini ITX - A Detailed Size Comparison

Which motherboard form factor is right for you? That’s a question that depends on many factors, including the case you plan to use, the type of CPU and memory you have, and even your own personal preferences. In this article, we take a look at the three most common sizes: ATX, micro ATX, and mini ITX. We discuss the pros and cons of each format and help you decide which one is best for your needs.

What is ATX?

The ATX form factor is the most common size for desktop computers. It’s been around since 1995, and its dimensions are standardized by the International Organization for Standardization (ISO).

ATX motherboards are typically larger than microATX or miniITX boards, and they offer more features and expansion options. They also tend to be more expensive.

If you’re building a high-end gaming PC or a powerful workstation, ATX is the way to go. It’s also a good choice if you think you might expand your system in the future.

What is Micro ATX?

Micro ATX is a smaller version of the ATX form factor, measuring 244mm x 244mm. As you might expect, this makes it more compatible with smaller cases. Also, it does not have as many expansion slots as ATX, so if you intend to build a system with multiple graphics cards or other expansion cards, then it is not the best option.

What is Mini ITX?

Mini ITX is the smallest of the three form factors, measuring 170mm x 170mm. This makes it ideal for builds where space is at a premium, such as in a small form factor case or an HTPC build. However, it also has the fewest expansion slots, so it’s not suitable for builds that require multiple graphics cards or other expansion cards.

Which form factor is right for you?

The answer to this question depends on a number of factors, including the case you plan to use, the type of CPU and memory you have, and even your own personal preferences. In general, ATX is the best choice for high-end gaming PCs and powerful workstations, while microATX and mini ITX are better suited for smaller builds. Ultimately, it’s up to you to decide which form factor is best for your needs.

Micro-ATX vs Mini-ITX vs ATX: A detailed Size Comparison

Now that you know the basics of each form factor, let’s take a more detailed look at the differences between them. Here’s a side-by-side comparison of the three most common sizes: ATX, microATX, and miniITX.

ATX

MicroATX

MiniITX

Dimensions (mm)

305 x 244

244 x 244

170 x 170

Number of Expansion Slots

• 7-9
• 4-6
• 1-2

Number of Memory Slots

• 4-8
• 2-4
• 1-2

Maximum CPU Cooler Height (mm)

• 160
• 140
• 95

Maximum Graphics Card Length (mm)

• 300+ (depending on the case)
• 210-240 (depends on the case)
• 140-170 (depends on the case)

As you can see, ATX is the largest of the three form factors, while mini ITX is the smallest. MicroATX falls in the middle, offering a happy compromise between size and expansion options.

The Pros and Cons of Each Form-Factor

Now that you know the basics of each form factor, it’s time to take a closer look at the pros and cons of each one. Here’s a quick overview of the key advantages and disadvantages of ATX, microATX, and mini ITX:

ATX

Pros:

• More expansion slots than microATX or mini ITX
• More room for multiple graphics cards or other expansion cards
• Greater compatibility with aftermarket CPU coolers
• More memory slots for future upgrades

Cons:

• The Larger size makes it less compatible with small form factor cases
• More expensive than microATX or mini ITX

MicroATX

Pros:

• The Smaller size makes it more compatible with small form factor cases
• More affordable than ATX
• Still offers enough expansion slots for most builds

Cons:

• Fewer expansion slots than ATX

Mini ITX

Pros:

• The Very small size makes it ideal for builds where space is at a premium
• More affordable than ATX
• Still offers enough expansion slots for some builds

Cons:

• Only one or two expansion slots
• Not suitable for builds that require multiple graphics cards or other expansion cards
• Limited space for aftermarket CPU coolers

Which Motherboard Form-Factor Should You Choose?

Now that you know the basics of each form factor, it’s time to choose the right one for your needs. Here are a few things to keep in mind when making your decision:

• If you plan on using a small form factor case, mini ITX is your best bet.
• If you want the most expanded options and compatibility, ATX is the way to go.
• Micro ATX is a good middle-ground option that offers decent expansion in a smaller package.

Ultimately, the right form factor for you depends on your specific needs and preferences. Use this guide as a starting point, then make your decision based on the other factors involved in your build. Good luck!

Conclusion

Weighing the Pros and Cons of Different Sizes. So, which form factor is right for you? The answer largely depends on your needs and preferences. ATX cases are typically larger and offer more space for components, while micro ATX cases are smaller with fewer expansion options. Mini-ITX cases are even tinier, making them a great choice if you’re limited in space. Ultimately, the best form factor for you comes down to balancing the pros and cons of each option against your individual needs. Let us know in the comments section which size case you ultimately choose and why!