What you need before you start

Building a gaming PC means buying individual components and assembling them yourself instead of buying a pre-built machine. You will need a CPU (processor), motherboard, RAM (memory), storage drive, graphics card, power supply, and a case to hold everything. You will also need a screwdriver — Phillips head, usually — and about two to three hours of uninterrupted time.

The most important rule: all parts must be compatible with each other. A CPU designed for one socket type will not fit a motherboard built for a different socket. A graphics card that draws too much power will not work with an undersized power supply. Before you buy anything, you need to pick a CPU first, then choose a motherboard that matches its socket, then build the rest of the system around those two pieces.

You do not need special tools, a clean room, or technical certification. You do need to avoid static electricity, which can destroy components. Touch a metal part of the case before you handle any parts, and avoid working on carpet if you can. Work on a wooden table or a concrete floor instead.

Key Takeaways

  • Start by choosing a CPU, then pick a motherboard with the matching socket type — these two decisions lock in the rest of your build.
  • Use a parts compatibility checker like PCPartPicker before you buy anything, because mismatched components will not work together.
  • The graphics card is usually the most expensive part and determines how well your games will run at high settings and frame rates.
  • You will install the CPU, RAM, and storage drive onto the motherboard before putting the motherboard into the case.
  • The power supply wattage must be higher than your system's total power draw — aim for at least 100 watts of headroom above what your parts need.

Choosing your CPU and motherboard

The CPU is the brain of your computer. For gaming, you have two main choices: Intel or AMD. Both make CPUs that work well for gaming, and the choice between them comes down to price and what games you want to play. Look at reviews for the specific games you care about — some games run better on Intel, others on AMD, and most run about the same on either one.

Once you pick a CPU, you must buy a motherboard with the correct socket. Intel CPUs use sockets like LGA1700 or LGA1200. AMD CPUs use AM5 or AM4. The socket name is printed on both the CPU and the motherboard — they must match exactly. The motherboard also determines how much RAM you can add later and what storage drives you can use, so do not skip this step.

For gaming, you do not need the most expensive CPU. A mid-range processor from the current generation will run modern games well. Spending more on the CPU than on the graphics card is usually a mistake — your graphics card has much more impact on gaming performance.

Picking RAM, storage, and a graphics card

RAM is the computer's short-term memory. For gaming in 2024, 16 gigabytes is the standard amount. Some newer games benefit from 32 gigabytes, but 16 will handle almost everything. RAM speed matters less than the amount — buy whatever speed your motherboard supports, which is usually listed in the motherboard manual.

Storage comes in two types: SSD (solid state drive) and HDD (hard disk drive). SSDs are much faster and are worth the money. Buy at least a 1-terabyte SSD for your operating system and main games. You can add a second drive later if you run out of space. Do not buy an HDD as your main drive — games will load slowly and your whole system will feel sluggish.

The graphics card is the most important part for gaming performance. It determines what frame rate you will get and what graphics settings you can use. Graphics cards are expensive — expect to spend 30 to 50 percent of your total budget on this one part. NVIDIA and AMD both make gaming graphics cards. Look at reviews for the specific games and resolution you want to play at. A card that costs $300 will play most games at 1440p resolution and high settings. A $500 card will handle 4K or very high frame rates.

Selecting a power supply and case

The power supply converts wall power into the right voltage for your components. You need to know how much power your system will draw. Add up the wattage of your CPU, graphics card, and motherboard — you can find these numbers in the product specifications. Then add 100 to 150 watts as a safety margin. If your parts draw 550 watts total, buy a 650 or 750-watt power supply.

Buy a power supply from a brand with a good reputation — Corsair, EVGA, Seasonic, and Be Quiet are common choices. Do not buy the cheapest power supply you can find. A bad power supply can damage your components or fail without warning. Look for one with an 80+ Bronze rating or higher, which means it converts power efficiently.

The case holds all your parts and keeps them cool. Pick one that fits your motherboard size — most gaming builds use ATX motherboards, which need an ATX case. The case should have at least two fans already installed. If it does not, you will need to buy fans separately. Cases range from $50 to $200. A mid-range case will work fine and usually looks better than the cheapest option.

Checking compatibility before you buy

Before you spend money, use PCPartPicker (pcpartpicker.com) to check that all your parts work together. Enter each component you plan to buy, and the site will flag any compatibility problems — a CPU that does not fit the motherboard socket, RAM that is not supported, a graphics card that does not fit in the case, or a power supply that is too weak.

PCPartPicker also shows you the lowest prices from different retailers and tells you which parts are in stock. You can save your build and share it with others for feedback. This step takes 15 minutes and saves you from buying parts that do not work together.

If the compatibility checker finds a problem, change the part that is causing it. Do not assume the checker is wrong — it catches real issues that would make your build fail.

Installing parts into the motherboard

Before you put anything in the case, install the CPU, RAM, and storage drive onto the motherboard while it is sitting on a flat surface. This is easier than doing it inside the case.

Start with the CPU. Open the socket on the motherboard — there is usually a lever or latch. Line up the CPU with the socket. The CPU will only fit one way — the corners have notches that prevent you from putting it in backwards. Lower the CPU straight down into the socket and close the latch. Do not force it. If it does not slide in smoothly, take it out and check the alignment.

Next, install the CPU cooler. Most CPUs come with a cooler in the box. Follow the instructions that came with the cooler — different coolers attach differently. The cooler sits on top of the CPU and pulls heat away from it. Without a cooler, the CPU will overheat and shut down within seconds.

Install RAM next. Open the clips on both ends of the RAM slot. Line up the notch in the RAM stick with the key in the slot — it will only fit one way. Push the RAM straight down until the clips snap closed on both ends. RAM should sit flush with the slot. If it is sticking up, it is not fully seated.

Install your storage drive last. If it is an M.2 SSD, open the small screw on the M.2 slot, insert the drive at a 30-degree angle, then push down and tighten the screw. If it is a 2.5-inch SSD, you will install it in the case later in a drive bay.

Putting everything in the case

Open the case by removing the side panels. Most cases have two panels — one on each side. Look for screws or latches holding them on. Set the panels aside somewhere safe.

Install the power supply first. It goes in the bottom rear of the case, usually in a separate compartment. Slide it in with the fan facing down if there is a vent in the case floor, or facing up if there is not. Screw it in with four screws.

Install the motherboard next. Most cases have brass standoffs — small metal posts that keep the motherboard from touching the metal case. Line up the motherboard screw holes with the standoffs, then screw the motherboard down. Do not overtighten — snug is enough.

Install the graphics card into the topmost PCIe slot on the motherboard. Open the clip at the end of the slot, line up the card with the slot, and push it straight down until it clicks. The card will stick out the back of the case. Screw the bracket on the back of the card to the case so it does not move.

Install any additional storage drives in the drive bays. Most cases have bays for 2.5-inch drives. Slide the drive in and screw it down on both sides.

Connecting power and finishing up

Connect the power supply to all your components. The power supply has several cables. The large 24-pin cable goes to the motherboard. A smaller 8-pin or 4-pin cable goes to the CPU. The graphics card has its own power connector — usually a 6-pin or 8-pin cable. SATA drives use a flat SATA power cable.

Connect the case's front panel connectors — the power button, reset button, and LED lights — to the motherboard. These are small pins on the motherboard labeled PWR_SW, RST_SW, and LED. The motherboard manual shows exactly where they go. Getting these backwards will not break anything, but the power button will not work.

Double-check that the CPU cooler is secure and that all power cables are plugged in firmly. Close the case panels and screw them back on. Plug the power supply into the wall and flip the power switch on the back of the power supply to the on position.

Press the power button on the case. The system should start up. If nothing happens, turn it off, open the case, and check that the 24-pin motherboard power cable and the CPU power cable are fully seated. These are the most common reasons a new build does not start.

Frequently Asked Questions

Do I need to install an operating system?

Yes. After the PC starts up for the first time, you will need to install Windows, Linux, or another operating system. You can download Windows from Microsoft's website onto a USB drive on another computer, then install it on your new PC. You will need a product key to activate Windows, which costs money.

What if my PC starts but nothing shows on the monitor?

Check that the monitor is plugged in and turned on. Make sure the video cable is connected to the graphics card, not the motherboard. If you have an AMD CPU with integrated graphics, you may need to remove the graphics card and plug the monitor into the motherboard to see if the system is working at all. Reseat the RAM and graphics card by removing and reinstalling them firmly.

Can I upgrade parts later?

Yes. You can add more RAM, swap the graphics card for a newer one, or add storage drives later. The CPU and motherboard are harder to change because they are connected to everything else, so choose them carefully the first time. Everything else can be upgraded when you have more money or want better performance.

How do I know if my power supply is strong enough?

Add up the wattage of your CPU and graphics card from their specification sheets. If the total is 450 watts, a 550 or 650-watt power supply is safe. If the total is 600 watts, buy 700 or 750 watts. The extra headroom keeps the power supply from running at maximum capacity all the time, which makes it last longer.

What is the difference between DDR4 and DDR5 RAM?

DDR5 is newer and faster, but more expensive. DDR4 is still very fast for gaming and costs less. Your motherboard supports one or the other — you cannot use DDR5 RAM in a DDR4 motherboard. Check your motherboard specifications to see which type it uses, then buy RAM that matches.