A motherboard is the central hub of your PC. It’s the board that physically connects your CPU, memory, storage, graphics card, and everything else, and keeps them talking to each other. Without it, there is no computer: your components can’t communicate, share power, or work as a single system. This guide breaks down what a motherboard actually does and walks you through the decisions that matter when you pick one. The goal here is to make sure that you end up with a board that fits your build without paying for features you’ll never use.
What does a motherboard actually do?
Think of a motherboard as the center of a web. Every component in your PC needs to connect to everything else. Some things connect through a wireless signal, some through a cable, and some are installed in a socket or slot. Your motherboard sits at the center of that web. It makes sure everything is connected, powered, and talking to one another.
What decisions matter most when picking a motherboard?
Since a motherboard connects all your components and manages the data, power, and signals between them, it affects every part of your PC experience in ways large and small.
When you choose one, the decisions that matter most are:
- the CPU socket (it has to match your CPU),
- the chipset (it sets your connectivity and overclocking options),
- the form factor (it has to fit in your case),
- the power delivery (it has to keep up with your CPU),
- cooling (you need to keep all your components operating comfortably),
- storage (you need the right options, both in terms of speed and number of drives you can install),
- UEFI (motherboard control software should be easy to use and filled with useful options for tweaking, customizing, and troubleshooting),
- and aesthetics (if you’re going to look at it, you want it to look right).
Most veteran PC builders start by picking a CPU and form factor, and then they select a chipset tier that matches how much they want to invest in performance, expansion, and connectivity. That limits their options to a much more manageable list that they can sort according to their needs.
Why does the CPU socket matter?
When you shop for a motherboard, one of the first things to check is the CPU socket it uses. You can’t force a CPU into any old socket. You need the exact one that matches your processor. But a motherboard is more than a fancy CPU holder. A network of traces across the board connects the socket to your memory, expansion slots, and chipset, and higher-quality boards use design details like additional PCB layers to keep that signal clean and reliable.
One odd thing to keep in mind: the CPU series you choose can have an effect on things like memory overclocking and available PCIe lanes.
What is a chipset, and which one should I pick?
One of a CPU’s primary dance partners is the chipset. This is a fairly large slice of silicon, usually tucked under a big heatsink, that acts like an air traffic controller for your PC. It manages the flow of data between your CPU and the rest of your components.
Your chipset is an early and important decision, because it has a direct impact on things like your expansion slots, M.2 storage slots, and USB ports. High-end X-series and Z-series chipsets are geared toward enthusiasts, and you can expect high-end connectivity, robust CPU overclocking support, and advanced tuning features. B-series chipsets are geared toward mainstream users, offering an excellent balance of performance, connectivity, and value.
| Chipset | Tier | Standout Traits | Recommend CPU Series |
|---|---|---|---|
| AMD X870E | Enthusiast | Premium connectivity CPU + memory overclocking | Ryzen 9 Ryzen 7 |
| AMD X870 | Enthusiast | High-end connectivity CPU + memory overclocking | Ryzen 7 |
| AMD B850 | Mainstream | Balance of performance, connectivity, and value CPU + memory overclocking | Ryzen 7 Ryzen 5 |
| Intel Z890 | Enthusiast | Premium connectivity CPU + memory overclocking | Unlocked Core Ultra 9 Unlocked Core Ultra 7 |
| Intel B860 | Mainstream | Balance of performance, connectivity, and value Memory overclocking | Core Ultra 7 Core Ultra 5 |
Lower-tier and previous-gen options exist, too, but that’s where you start to give things up. That might mean fewer M.2 slots, fewer and slower USB ports, and no CPU overclocking support. For a basic PC build, that could be fine, but if you’re building a serious gaming rig or a creative workstation, you’re usually better off spending just a little more.
How does a motherboard handle power?
Power enters your motherboard through a couple of connectors, one for the board in general, and one or two dedicated to your CPU. Some boards also include an extra 8-pin connector that supplies supplemental, more stable power to your expansion slots and M.2 storage.
From there, the board’s job is to convert that power into stable, clean voltage for your CPU. A motherboard that keeps its power circuitry cooler under load is a motherboard that’s likely to offer a longer, more reliable lifespan. That matters most when you’re installing a very high-end CPU. A mainstream board with a mainstream power solution will do just fine for a mainstream CPU. You don’t need to overspend on power delivery you won’t use.
How does a motherboard connect my memory and storage?
Your PC constantly reads, writes, and stores data, so it needs both temporary and long-term storage. Your motherboard is where and how those devices connect.
Memory (RAM) holds data temporarily while it’s actively in use. It’s extremely fast, and it installs in dedicated slots located close to your CPU. Not every board offers the same memory overclocking support, so if you’re investing in a high-end memory kit, a more premium board will let you take full advantage of it.
For long-term storage, most people now install M.2 drives. They’re small, fast, and convenient. Motherboards typically also offer SATA ports for older-style drives. Some motherboards have more M.2 slots than others, and some of those slots support the latest PCIe 5.0 drives while others are limited to previous-generation speeds. We recommend looking for a board that meets your storage needs today while leaving you room to add more storage down the road.
How does a motherboard handle networking?
Your motherboard gives you options for getting online. At a minimum, you’ll have an Ethernet port to connect a hard line to your local network, and many boards can also connect to a wireless network and your Bluetooth devices. More advanced options include additional or faster Ethernet ports.
If your motherboard doesn’t come with a WiFi card, no worries. You can add this capability through a USB adapter or an expansion card and get the job done.
What do expansion slots do?
Expansion slots let you expand the capabilities of your PC. These days, most people use them to install a graphics card. A graphics card dramatically increases your gaming performance, but that’s not all. It’s also essential for many types of creative work and AI processing.
Because they’re versatile, expansion slots are also used for sound cards, network adapters, capture cards, HBA cards, and RAID cards.
What audio options does a motherboard offer?
Unless you’re using a wireless headset with its own DAC and amp, or connecting audiophile-grade gear to a dedicated audio interface, you’re going to plug your headset and speakers into your motherboard.
You’ll find at least the basics on the rear I/O panel for a microphone and speakers, plus a header for connecting any audio jacks on the front of your case. More premium audio solutions give you more options and a better experience with high-end headsets.
How many USB ports do I need?
Your motherboard makes sure you have plenty of places to plug in USB devices, and you’ll find the bulk of them on the rear I/O panel. The number of ports, and how fast and versatile they are, depends entirely on the board you pick.
For convenience, your PC case usually offers front-panel ports, too, but they do nothing until you connect them to USB headers on your motherboard. Those headers support data transfer, and on many boards, they can also provide useful extras like USB Power Delivery (Quick Charge) for fast charging. Plan ahead for how you want to use these ports, and pick a board that provides what you need.
How does a motherboard help keep my PC cool?
Keeping your PC cool matters, so you’ll find fan headers spread across your motherboard that connect to your case fans. Your PC uses temperature data to speed those fans up or slow them down to hold your components at a comfortable temperature, and a good board gives you easy options to tune that balance between cooling and noise.
Your board also includes dedicated headers for CPU cooling. At a minimum you’ll have a CPU fan header, and higher-end boards add headers for AIO liquid coolers or fully custom loops — look for an AIO_PUMP header, or a W_PUMP+ header for high-performance units.
What is the UEFI (or BIOS), and why does it matter?
When you buy a motherboard, you’re paying for more than hardware. You’re also getting a suite of software tools for setting up and tweaking your PC, accessed through an interface called the UEFI — or, as some people still call it, the BIOS. This interface varies by brand and board series.
In fact, the UEFI is one of the big reasons experienced builders prefer one board brand over another. Every board gives you the basic tools, but the similarities stop pretty quickly. The best brands ship regular firmware updates, design a UEFI layout that’s easier for first-time builders, give you options for tackling unexpected problems, and support enthusiasts with advanced features that unlock new possibilities.
Do motherboard aesthetics matter?
Motherboards vary in looks, too. Many builders choose cases that show off their hardware, so they pick a board that fits the style of their build — a classic black, a clean white, something professional, something aggressive, or something simple. The best manufacturers give you a wide range of options to match.
Even after you pick your board, you can customize the look of your build with ARGB headers that connect to RGB light strips and to the RGB elements of your case and fans.
What’s the difference between ATX, microATX, Mini-ITX, and EATX?
Motherboards aren’t all the same size and shape. They follow standardized patterns so you can easily find a compatible case, but some are bigger and some are smaller. The standard size is called ATX, and it’s usually what we recommend for a first-time builder, as it’s the easiest option for picking compatible parts and building a PC.
You’ll also see larger EATX boards, which are typically the fully-loaded, “everything but the kitchen sink” options in the motherboard world. MicroATX boards make smaller builds possible, while Mini-ITX boards are the palm-sized workhorses of the small-form-factor world.
Frequently asked questions
How do I know which motherboard will fit my CPU?
Start with the CPU socket. Every motherboard is built around a specific socket, and your CPU has to match it exactly. Once you’ve picked your CPU, filter your motherboard options by its socket, then choose a chipset tier that matches your performance goals and budget.
What’s the difference between an X870E and an X870 motherboard?
Both are high-end AMD chipsets, but the X870E is the more fully-loaded option, offering additional PCIe lanes that motherboard manufacturers can put to work in a variety of ways. Typically, that means more and faster USB ports, perhaps a faster or larger set of M.2 slots.
Do I need a high-end motherboard to game well?
Not necessarily. A mainstream B-series board pairs perfectly well with a mainstream CPU for gaming, since games stress the graphics card more than the CPU. You mainly benefit from a higher-end board if you’re installing a top-tier CPU, a high-end memory kit, or you want extra storage and expansion options.
Should my first build be ATX, microATX, or Mini-ITX?
For a first-time builder, ATX is the safest choice. It has the widest range of compatible cases and parts, and it makes the build process straightforward. Smaller PC builds often require a bit more expertise, since you’ll have to plan out the physical compatibility of all your parts more carefully. Move to microATX or Mini-ITX once you have a specific reason, like a space constraint or a compact design goal.
Can I add WiFi later if my board doesn’t have it?
Yes. If your motherboard doesn’t include a WiFi card, you can install a separate adapter through a USB port or an expansion slot.
Browse our latest motherboard options
Here, we’ve covered the basics. There’s a lot more to learn about motherboards, so the next step is finding the board that fits your build.
Click here to browse our full lineup of AMD motherboards.
Click here to browse our full lineup of Intel motherboards.
Click here to read our full X870E/X870 motherboard guide.
Click here to read our full Z890 motherboard guide.
And to see what separates ASUS PC hardware from the rest of the pack, click here to browse all our latest articles on motherboards, graphics cards, PC cases, power supplies, and more.