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How to Build a Gaming PC: The Step-by-Step Guide

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Learning how to build a gaming PC is easier than it looks. The parts only fit together one way, and every connector is shaped to its socket. What makes a first build go smoothly is doing things in the right order and checking your work before you close the case.

Short answer: install the processor, memory, SSD and cooler on the motherboard outside the case. Then mount the board, install the power supply and graphics card, and connect the cables. Test the first boot, then enable your memory profile and install Windows and drivers.

This guide is part of our PC builder hub. If you haven't chosen parts yet, start with our PC build guide, which covers compatibility.

High-end graphics cards from NVIDIA's RTX 50 series often use the 12V-2x6 power connector, which must be pushed in fully and not bent sharply near the plug.

How to Build a Gaming PC: Before You Start

Gather your tools. A Phillips #2 screwdriver, a flashlight, small bowls for screws, and cable ties or Velcro straps.

Clear a hard, well-lit table. Avoid carpet. Keep drinks and pets away.

Open the manuals. The motherboard manual shows where each cable goes. Keep it open throughout.

Ground yourself. Touch a grounded metal object before handling parts, and handle boards by their edges.

Check your parts. Unbox everything and check nothing is damaged or missing.

Step 1: Install the Processor

Place the motherboard on its box. Open the CPU socket's retention arm. Line up the triangle marker on the corner of the processor with the marker on the socket, then set the chip down gently. Don't push. Close the retention arm, which may take firm pressure on Intel boards.

Step 2: Install the Memory

Check the manual for which slots to use with two sticks. It is usually the second and fourth slots from the processor. Open the latches, line up the notch on the stick with the key in the slot, and press straight down on both ends until the latches click.

Step 3: Install the M.2 SSD

Find the M.2 slot, usually under a heatsink cover. Remove the cover, slide the SSD in at a slight angle, press it flat, and secure it with the screw or latch. Remove any plastic film from the heatsink pad before replacing the cover.

Step 4: Install the CPU Cooler

Follow the cooler's own instructions for mounting brackets. If the cooler doesn't have thermal paste already applied, add a small pea-sized dot to the center of the processor. Mount the cooler evenly, tightening screws a little at a time in a cross pattern. Plug the cooler's fan cable into the CPU_FAN header.

If you're using a liquid cooler, you may find it easier to mount the radiator in the case first and attach the pump to the processor after the motherboard is installed.

Step 5: Prepare the Case

Remove both side panels. Check that the standoffs, the small posts the motherboard screws onto, match your board's holes. Most cases come with them pre-installed for ATX boards. If your motherboard doesn't have a pre-attached I/O shield, snap the shield into the back of the case now.

Step 6: Install the Motherboard

Lower the board into the case at an angle so the rear ports line up with the I/O opening. Line up the screw holes with the standoffs and fasten the screws until snug, not tight.

Step 7: Install the Power Supply

Mount the power supply in its bay, usually at the bottom rear, with the fan facing a vented area. Secure it with four screws. If it is modular, connect only the cables you need: the 24-pin motherboard cable, the 8-pin CPU cable, and the GPU power cable.

Step 8: Connect the Main Power Cables

• 24-pin to the large connector on the right edge of the motherboard.
• 8-pin CPU power (sometimes two) to the top-left corner of the board.

Route cables through the case's cutouts to keep them behind the motherboard tray.

Step 9: Install the Graphics Card

Remove the slot covers on the back of the case that line up with the top PCIe x16 slot. Open the slot's latch, line up the card, and press it in until the latch clicks. Screw the card's bracket to the case.

Connect the GPU power cable. If it uses the 12V-2x6 connector, push it in until it is fully seated with no gap, and avoid bending the cable sharply right at the plug. If the card is heavy, fit a support bracket to stop it sagging.

Step 10: Connect the Front Panel and Fans

• Front panel header: the small power button, reset and LED wires. Check the manual for the pin layout.
• Front USB and audio cables to their headers.
• Case fans to the SYS_FAN or CHA_FAN headers.
• Lighting cables, if any, to the ARGB headers.

Step 11: First Boot

Before tidying cables, test the system:

1. Plug the monitor into the graphics card, not the motherboard.
2. Connect a keyboard and mouse, plug in the power cord and switch on the power supply.
3. Press the power button.

You should see the motherboard logo and the option to enter the BIOS. If nothing appears, switch off and check the GPU power cable, the memory seating and the 8-pin CPU cable. Diagnostic lights on the board show which part is stopping the boot.

Step 12: BIOS Settings

In the BIOS, check that it detects your processor, memory and SSD. Then:

• Enable EXPO or XMP so the memory runs at its rated speed.
• Check the boot drive is your SSD or the Windows USB stick.
• Update the BIOS later if the motherboard maker lists fixes for your processor.

Step 13: Install Windows

Create a Windows 11 installation USB stick from Microsoft's website on another computer. Boot from it and follow the prompts. The Windows 11 system requirements page lists what's needed.

Step 14: Drivers and Updates

1. Run Windows Update until nothing is left.
2. Install the chipset drivers from your motherboard maker's website.
3. Install your graphics driver through the NVIDIA app or AMD Software.
4. Set your monitor to its highest refresh rate in Windows display settings.

Step 15: Tidy Up

Once everything works, switch off and tidy the cables with ties or straps. Tidy cables look better and let air flow more freely. Replace the side panels.

Troubleshooting a First Build

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Safety Tips While You Build

• Keep the power supply switched off and unplugged while you work inside the case.
• Handle boards by their edges, and don't touch the gold contacts.
• Don't force any connector. Each one fits only one way.
• Watch for sharp edges inside cheaper cases.
• Keep screws in a bowl, so none fall onto the motherboard.

After the Build: Your First Week

Watch temperatures in the first few gaming sessions with the GPU maker's software or a free monitoring tool. If the processor runs very hot, check that the cooler is seated evenly and that its fan is plugged in. Check that the memory runs at its rated speed. Then tidy any cables you left loose during testing.

Verdict: How to Build a Gaming PC

Build a gaming PC in the right order: processor, memory, SSD and cooler on the motherboard first, then the board into the case, then the power supply, graphics card and cables. Test the first boot before tidying anything, plug the monitor into the graphics card, enable EXPO or XMP, and install Windows and drivers. If you are still picking parts, our budget PC build guide has a complete example.