Short Answer

Micro ATX is the best choice in the majority of cases. Only go with ATX if you need more than 4 PCIe slots and only go with Mini ITX if you want the most compact PC that you can get.

Motherboards come in a variety of sizes and formats, but there are three formats that are generally the most popular choices for desktop PCs these days: ATX, Micro ATX, and Mini ITX.

So, how do these differ, apart from the size, that is?

In this article, we will be looking at each of the motherboard formats mentioned above and comparing their differences in the interest of helping you decide which is ultimately the best choice for your needs!

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ATX vs Micro ATX vs Mini ITX

atx vs micro atx vs mini atx

Size

As you can see from the image above, ATX is the largest format of the bunch, measuring 305×244 mm.

The Micro ATX is close behind measuring 244×244 mm, which makes it a tad shorter.

Finally, there’s the Mini ITX motherboard, which is the smallest of the bunch at a diminutive 170×170 mm.

As far as size itself is concerned, the only thing you need to worry about is whether your case is large enough to fit the motherboard. However, you don’t have to worry about the case being too large, as modern cases feature a standardized layout meant to accommodate any motherboard that can physically fit inside.

So, what should you keep in mind when picking the right motherboard format, then?

RAM Capacity

atx vs micro atx

One of the key differences between Mini ITX and the two ATX motherboards is the number of RAM slots that the motherboard comes with.

Namely, Mini ITX motherboards come with only two RAM slots, whereas Micro ATX and ATX  motherboards usually come with four. However, some high-end ATX motherboards can feature as many as eight RAM slots.

That said, Mini ITX motherboards can currently only accommodate up to 32 GB of RAM if a 2×16 GB kit is installed. In contrast, most Micro ATX and ATX motherboards support at least 64 GB, though some Micro ATX models can go as high as 128 GB while certain ATX models can go all the way up to 512 GB.

But of course, those are again somewhat extreme cases that apply only to pricey cutting-edge motherboards.

In any case, 16 GB of RAM is enough to comfortably run the vast majority of games currently available, and 32 GB is often overkill for gaming rigs. However, setups with more RAM are ultimately more future-proof. Besides, those who also intend to use their gaming setup as a workstation might need more than 32 GB of RAM to run some memory-hungry software.

In any case, as far as RAM is concerned, there’s no need to worry about capacity, as even a Mini ITX motherboard will have most gamers’ needs covered.

PCIe Slots

micro atx vs atx

Now, another very noticeable difference between all three of the aforementioned motherboard formats is the number of PCI Express slots that they come with.

ATX motherboards definitely have the lead in this department, as most come with three PCIe slots, although some high-end models can boast as many as five. 

Meanwhile, Micro ATX motherboards usually have only one PCIe slot but can go up to three, and Mini ITX models are stuck with only a single PCIe slot.

Obviously, extra PCIe slots can come in handy if you’re thinking about a multi-GPU setup or about installing any expansion cards e.g., sound cards, capture cards, internal modems, etc.

But of course, it’s not all about the number of slots in this case, as the question of free space arises once again. Many modern graphics cards are quite thick, as their bulky coolers could potentially obstruct some of the slots.

However, a graphics card could also potentially be obstructed by the case itself, if we’re talking a small form factor case, so that’s another thing to keep in mind.

Price

mini atx vs atx

And finally, there is the matter of price. You would think that Mini ITX motherboards would be the cheapest due to their small size requiring less manufacturing materials, but the truth might surprise you.

More often than not, you’ll find that Mini ITX motherboards are the most expensive, at least as far as the starting prices are concerned. ATX and Micro ATX motherboards usually start at about $50 or $60, whereas Mini ITX models start at about $100.

That said, Micro ATX motherboards are generally the best budget picks as it’s easier to find a quality Micro ATX motherboard at a lower price point.

ATX motherboards, on the other hand, offer the best overall value for your money if you need the extra PCIe slots. Meanwhile, Mini ITX solutions are only worth investing in if you intend to build a compact gaming PC.

Which Should You Choose?

Now that we have looked over the important qualities and specifications let’s address the critical question: which should you pick?

The answer depends largely on what type of PC you will be putting together and how much use you intend to make of PCIe and RAM slots.

Gaming PC

matx vs atx

If you’re building a gaming PC, we advise going with a Micro ATX motherboard for most configurations and only consider ATX if you really need those extra PCIe slots.

A Micro ATX motherboard will almost always offer the best value for your money – it will have more than enough PCIe slots and enough space for all the RAM that a gaming PC would need, and it will likely be more affordable than an ATX option.

Of course, as mentioned above, ATX motherboards are still viable if you really need the extra PCIe  slots, but as far as regular gaming PCs are concerned, it will hardly offer something that a Micro ATX alternative couldn’t

Finally, a Mini ITX motherboard might seem like a poor choice for a gaming PC. After all, they are pricey and have limited RAM and only one PCIe slot. However, if you’re going for small form factor, then there is no better option.

Gaming PC/Workstation

motherboard size

If you intend to use your PC not only for gaming but also for certain professional software, then the extra space i.e., the extra PCIe and RAM slots, might be appealing.

However, Mini ITX is obviously not very appealing here, as it offers limited space, and small form factor cases usually don’t cool off as efficiently, which can be an issue if you intend on subjecting the PC to high workloads.

Desktop PC

microatx vs atx

Finally, if all you intend to use a PC for is the Internet, multimedia, some occasional office work, or some casual gaming, the best solution for you would be the cheapest one.

That said, a Micro ATX motherboard would be the way to go once again, as it’s usually the cheapest option available and will have everything you need.  However, if you really want to build a highly compact PC, spending an extra $50 on a Mini ITX motherboard might be worth it.

Conclusion

As always, preferences and requirements differ from user to user, so none of the three mainstream motherboard formats can be the best choice for everyone.

So, let us summarize, shall we?

ATX

The Pros:

  • High number of PCIe slots
  • Supports multi-GPU setups/several expansions cards
  • Highest RAM capacity

The Cons:

  • Largest of the bunch
  • The more feature-rich ones can get pricey

Micro ATX

The Pros:

  • Balanced feature set
  • Affordable
  • Sufficient RAM for most PCs

The Cons:

  • Might have too few PCIe slots for some users

Mini ITX

The Pros:

  • Extremely compact
  • Allows for compact and portable PCs

The Cons:

  • Limited RAM
  • Only a single PCIe slot
  • Not all graphics cards will fit small form factor cases

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