How to Build a Gaming PC

Why build your own

Building a PC sounds scary the first time. It is not. A modern desktop is a set of parts that plug into each other in only a few ways, and if you can follow a recipe, you can build one in an afternoon.

The reasons to do it are practical. You choose every part, so you spend your money where it helps you most. You can upgrade one piece at a time, instead of replacing the whole machine. And you learn how your computer works, which makes it much easier to fix when something goes wrong.

It is not always cheaper than a ready-made PC, especially when a shop runs a good sale, and it takes some patience. If you want the machine on day one with a warranty from one seller, a pre-built one can be the better choice. But if you enjoy the process, or you want something specific, building is rewarding.

This guide walks through the whole job: choosing the parts, checking that they fit together, putting them in the case, and starting the machine for the first time. We do not list prices or exact products, because both change every few months. Instead, we explain how to decide, so the guide stays useful whenever you read it.

Start with the purpose

Before you look at a single part, write down what the computer is for. A PC for gaming is built differently from one for video editing, and both differ from a quiet office machine.

For games, the graphics card matters most, then the processor, then memory. For video editing and 3D work, the processor, memory and fast storage matter, and a good graphics card helps too. For office and study, a modest processor, enough memory and an SSD are all you need, and you can skip the graphics card if the processor includes graphics.

Then think about the screen. The resolution and refresh rate of your monitor decide how strong a graphics card you need. A powerful card on a basic screen is wasted, and a weak card on a high-resolution screen will struggle. Plan the monitor and the PC together.

Finally, set a total budget and include everything: the case, the power supply, the operating system, a monitor, a keyboard and a mouse, if you need them. People often forget these and then run out of money at the end.

The parts, one by one

Processor (CPU)

The processor does the thinking. The two main makers are Intel and AMD. For gaming, a good mid-range processor is usually enough, because most games depend more on the graphics card. For editing and heavy work, more cores help. The most important detail is the socket type. A processor only fits a motherboard with the matching socket, so choose these two together.

Motherboard

The motherboard connects everything. It decides which processor, which type of memory and how many drives and ports you can use. Sizes come in standard formats, with ATX the largest of the common ones and smaller ones called micro-ATX and mini-ITX. Smaller boards fit small cases but often have fewer slots and cost more for the same features. Check that the board has the ports you need, such as USB-C, enough fan headers and a network connection.

Memory (RAM)

Memory comes in two main generations, and they do not fit into the same slots. Your motherboard supports one or the other, so check before buying. For a gaming PC, 16 GB is a common starting point and 32 GB gives you more room for heavy tasks. Buy two matching sticks instead of one, because it lets the memory run in dual channel, which is faster. After you build the PC, you may need to turn on the memory profile in the BIOS so that it runs at its rated speed.

Graphics card (GPU)

This is the biggest single spend in most gaming builds. Check its length and thickness against your case, since many modern cards are very large. Check also the power connectors it needs and that your power supply has them. Do not buy a card based on the name alone, because models with similar names can differ a lot in speed.

Storage

Use an SSD for your system and games. The small, fast type that plugs straight into the motherboard is called NVMe, and it is far faster than older hard drives. A drive of 1 TB is a comfortable size for many people, since games and updates are large. You can add a second drive later for extra space.

Power supply (PSU)

The power supply is the part you should never cheap out on. A poor one can damage other parts. Choose a reliable brand with a good warranty and some extra power capacity beyond what your parts need, so it does not run at its limit. Look for an efficiency rating, such as 80 Plus, and check that it has all the cables your graphics card needs.

Case

A good case has room for your parts, good airflow and easy access for building. Check the maximum graphics card length, the height of the processor cooler it supports and how many fans it can hold. A dust filter on the front and bottom saves cleaning time later.

Cooling

The processor needs a cooler. Many processors come with a basic one, and some do not. A good air cooler is simple, quiet and reliable. A liquid cooler with a radiator can look neat and cool well, but it costs more and has more parts that can fail. For most builds, a good air cooler is plenty. Whatever you pick, check that it fits your socket and your case.

Where to spend and where to save

A common idea is to put the money into the graphics card, the power supply and the storage, and then pick modest options for the rest. This works well for most gamers.

Check that everything fits

Most failed builds come from parts that do not match. Take an evening to check these points on paper before you buy anything.

• Processor and motherboard socket. They must be the same type, and the board may need a BIOS update for newer chips.
• Memory type. The motherboard must support the memory generation you choose.
• Cooler and socket. The cooler must support your socket and fit under the case side panel.
• Graphics card and case. Compare the card length with the case's maximum.
• Power supply connectors. Count the cables your graphics card and motherboard need.
• Motherboard size and case. The case must support that board size.
• Drive slots. Check the board has enough M.2 slots for your drives.

Free online tools can check part compatibility for you. They are helpful, but they can be wrong, so also read the specifications on the maker's own page.

Tools and workspace

You need very little. A magnetic Phillips screwdriver is the main tool. Add a pair of small scissors or cable ties for the wires, and a flashlight. Use a clean, well-lit table with enough room for the boxes and the case.

Static electricity can harm parts, though in practice it is rare. Touch the metal of the case now and then, avoid working on thick carpet and do not wear a woollen jumper. An anti-static strap is a cheap extra if you want extra safety.

Keep the small screws in a bowl or a magnetic tray. Keep the manuals and the little bags of extras that come with the motherboard and case, since they have cables and screws you will need.

Building step by step

1. Prepare the motherboard outside the case

Put the motherboard on its box, or on a flat surface. It is easier to install the processor, memory and storage drive before you put the board into the case. Open the processor socket lever. Line up the small triangle on the processor with the mark on the socket, and lay it in gently without pressing. Close the lever. If it resists, stop and check the alignment.

2. Install the memory and the M.2 drive

Open the clips on the memory slots, line up the notch, and press until both clips click. Use the slots recommended in the manual for two sticks. For the NVMe drive, remove the small cover on the M.2 slot, slide the drive in at an angle, press it flat and fasten the little screw.

3. Fit the cooler

Follow the instructions for your cooler. Many already have thermal paste applied. If not, apply a small pea-sized amount in the middle of the processor. Mount the cooler evenly, and tighten the screws in a cross pattern. Plug the cooler fan into the correct header on the board.

4. Prepare the case

Remove both side panels. Check that the small brass spacers, called standoffs, match the holes for your board size. Many cases come with them already fitted. Fit the power supply, with the fan facing the right way. Usually it faces down if the case has a vent at the bottom, with a filter.

5. Install the motherboard

Lower the board in carefully and line it up with the standoffs. Fasten it with screws, without too much force. Connect the large cable from the power supply to the board, the 24-pin one, and the processor power cable, usually found at the top corner. Push firmly until both click.

6. Add the graphics card

Remove the right slot covers from the back of the case. Open the lock at the end of the long slot on the board, then push the card in until the lock clicks. Fasten the card to the case with screws. Plug in the power cables from the power supply, using separate cables if the card needs more than one. Push the connector all the way in. A half-seated connector is one of the commonest causes of trouble.

7. Connect the front panel and fans

The tiny wires from the case, for the power button, lights, USB and audio, go to pins on the board. Check the motherboard manual, because it shows the order. Connect the case fans to the fan headers. Fans at the front and bottom should pull air in, and fans at the back and top should push it out.

8. Manage the cables

Route the cables behind the motherboard tray when possible, and tie them neatly. This is not only for looks. Good cable management improves airflow and makes later upgrades easier.

First start

Before you close the case, do a first test. Connect the monitor to the graphics card, not to the motherboard. Plug in the keyboard and the power cable, and press the power button.

If you see the BIOS or the maker's logo, you have succeeded. In the BIOS, check that the processor, memory and drives are recognised. Turn on the memory profile if it is available, and set the fans to a sensible curve.

Next, install the operating system from a USB stick. You can prepare the stick on another computer using the maker's own tool. Follow the steps, choose your drive and wait. After that, install the latest drivers, starting with the chipset and graphics drivers from the official sites.

Finally, test the machine. Run a game or a stress test for half an hour and watch the temperatures. If everything is stable and the temperatures are reasonable, close up the case and enjoy your work.

If it does not start

Do not panic. Most problems have simple causes. Go through this list in order.

• Is the power supply switch on, and is the cable plugged in?
• Is the 24-pin cable and the processor power cable fully seated?
• Are the memory sticks pushed in until the clips click? Try one stick at a time.
• Is the monitor plugged into the graphics card, and on the correct input?
• Are the graphics card's power cables firmly connected?
• Did you remove the plastic cover from the cooler's base?
• Are the front panel wires on the right pins, especially the power switch?

Many boards have small diagnostic lights or a code display that point to the problem. The manual explains what they mean. If you still cannot find the fault, remove everything except the processor, one memory stick and the cooler, and add parts back one at a time.

Monitor and accessories

The best PC is held back by a poor screen, so plan this part with care.

For the monitor, look at size, resolution, refresh rate and panel type. A 24 to 27 inch screen at a common resolution is a good start for most desks. A higher refresh rate makes games feel smoother, but only if your graphics card can produce that many frames. Colour accuracy matters if you edit photos or video.

For the keyboard and mouse, comfort comes first. See our guides for keyboards and mice. For sound, a good pair of headphones is usually a better buy than cheap speakers, and our headphone guide can help. If you plan to stream or record, add a webcam and a microphone, and have a look at the studio and podcast pages.

A chair and a desk also count. After a few hours of play, the best hardware cannot make up for a bad seat.

Building a quiet PC

If noise bothers you, a few choices make a big difference. Pick a case with sound-dampening panels and good airflow, since good airflow lets fans spin slowly. Use larger fans, which move more air at lower speed. Choose a power supply that can run its fan slowly or stop it at low loads.

Choose a graphics card with a large cooler, as its fans are usually the loudest part under load. Set the fan curves in the BIOS so that they stay slow until the temperature really rises. Hard drives can be noisy too, so use SSDs for the main storage.

Place the computer where air can flow in and out. A PC squeezed into a closed cabinet will run hotter and louder.

After the build

Once the machine works, a few small jobs will keep it healthy.

• Write down your parts list with serial numbers and purchase dates.
• Keep the manuals and the spare cables in a labelled box.
• Create a recovery USB stick for the operating system.
• Set up automatic backups for your files.
• Clean the dust filters every month or two, and the inside once or twice a year.
• Keep the graphics driver and the system updated, but do not install beta drivers unless you need a fix.

A tidy and well-documented machine is easier to fix and upgrade, and it will feel like yours.

Choosing a budget level

Rather than quote prices that will be out of date, here is how a build changes as the budget grows.

Entry level

The aim is smooth gaming at a common resolution and moderate settings. You pick a sensible processor, a graphics card at the lower end, 16 GB of memory and a 500 GB to 1 TB SSD. Do not skimp on the power supply.

Mid range

Now you can play most new games at high settings. The graphics card is stronger, the processor has more cores, and you can add a bigger drive and a better case with better airflow.

High end

You can aim for high resolution or very high refresh rates, and for heavy work such as editing and streaming together. The parts get more expensive faster than they get faster, so compare value carefully at this level.

Whatever your budget, balance matters more than any one part. A great graphics card with a weak processor, or the other way round, wastes money. For laptop options, see our gaming laptop comparison.

Upgrading later

One of the best things about a desktop is that it can grow. If you plan well, you can keep the case, power supply and motherboard for years and replace only the graphics card or add memory when needed.

To keep that option open, choose a motherboard with a modern socket, buy a power supply with some spare capacity and pick a case with room for bigger parts. When you upgrade, check again that the new part fits and that the power supply can cope.

Also keep a note of what you bought and when. Keep the boxes and receipts for the warranty. And back up your files, whatever you do.

Mistakes to avoid

• Buying parts before checking compatibility. Check the list first.
• Saving on the power supply. It is the heart of the system.
• Forgetting the monitor and accessories. Include them in the budget.
• Forcing parts. Components should go in with firm, even pressure, not violence.
• Plugging the monitor into the motherboard. It will not use the graphics card.
• Ignoring airflow. A hot PC is a slow and noisy PC.
• Skipping the BIOS memory profile. Your memory may run slower than its rated speed.

Common questions

Is it cheaper to build or buy?

It depends on the time and the market. Building often gives better parts for the same money, but sales on ready-made PCs can be competitive. Compare real prices on the day.

How long does building take?

A first-time build usually takes a few hours, including the cable work and software. Do not rush.

Do I need liquid cooling?

Not for most builds. A good air cooler is quiet and reliable. Liquid cooling is mostly for looks and for very hot processors.

Do I need to buy Windows?

You need an operating system. Windows needs a licence. There are free alternatives like Linux, but your games and programs may not all run on them. See Windows 11 vs macOS for background.

Should I choose a laptop instead?

If you need to move, yes. For the same money, a desktop usually gives more speed. Read our laptop guide to compare.

Part names and standards change often. Check the official specifications before you buy. If you notice an error, please tell us on the contact page, and see how we write on the methodology page.