Which parts do you need to build a computer? – The complete guide for beginners 2025

Building your own computer might seem complicated, but at its core, it's about combining the right parts – much like assembling a puzzle.
The advantage is that you get exactly the performance, quietness, and style you want, often at a better price than pre-built computers.

In this guide, we'll go through all the components you need to build a computer, what they do, and what to consider when choosing them.

Main Components – What Every Computer Must Have

Every computer consists of a number of basic parts. Below, we'll go through them in logical order – from the "brain" to the power supply.

1. Processor (CPU) – The Computer's Brain

What it does:
The processor handles calculations, logic, game engines, and programs. It is the heart of the computer.

What to consider:

• Number of Cores: 6–8 cores are sufficient for gaming, 12+ for heavy tasks like streaming or rendering.

• Clock Speed: Higher GHz = faster response, but efficient architecture is more important.

• Manufacturer:

  • AMD Ryzen 7000 series (e.g., Ryzen 5 7600X) – very good value and energy efficient.

  • Intel 13th–14th gen (Core i5/i7/i9) – strong in games, especially at high FPS.

Tip: Always match the CPU and motherboard to the correct socket (e.g., AM5, LGA1700).

2. Motherboard – The Hub Everything Connects To

What it does:
Connects all components – CPU, RAM, GPU, storage, fans, audio, and ports.

What to consider:

• Socket: Must match your CPU (e.g., AMD AM5, Intel LGA1700).

• Chipset: Determines features like overclocking, number of ports, and M.2 slots.

• Form Factor:

  • ATX: Standard size, many ports.

  • Micro-ATX: Smaller, cheaper.

  • Mini-ITX: Compact, but fewer connections.

Tip: Buy a motherboard that supports DDR5 if you're building new – it's more future-proof.

3. RAM (Random Access Memory)

What it does:
RAM stores temporary data that games and programs need quickly. More RAM = more things simultaneously.

What to consider:

• Capacity:

  • 16 GB is enough for gaming.

  • 32 GB is recommended for streaming, editing, and future-proofing.

• Speed: Measured in MHz – e.g., 6000 MHz for DDR5.

• Dual channel: Always install two sticks (e.g., 2×8 GB) for better performance.

Tip: Check that the motherboard supports the RAM's speed via BIOS (XMP/EXPO profiles).

4. Graphics Card (GPU) – For Gaming and Graphics

What it does:
The graphics card renders images, games, and videos. It is the most important component for gaming.

What to consider:

• VRAM:

  • 8–10 GB is sufficient for 1080p.

  • 12–16 GB for 1440p and future games.

• Manufacturer:

  • NVIDIA GeForce RTX 40 series: Best for ray tracing and DLSS.

  • AMD Radeon RX 7000 series: Good value and plenty of VRAM.

  • Intel Arc: Budget option, still new to the market.

Tip: Make sure your power supply has the correct power connectors (8-pin or 12VHPWR) for the graphics card.

5. Storage – SSD and optionally HDD

What it does:
Stores the operating system, games, and files. Today, SSDs are standard – faster and quieter than old hard drives.

What to consider:

• NVMe SSD: Fastest (PCIe 4.0/5.0). Perfect for OS and games.

• SATA SSD: Slightly slower but cheaper.

• HDD: Good as secondary storage for large files (e.g., recordings).

Recommendation:

• 1 TB NVMe SSD for games and OS.

• Optionally, a 2 TB HDD for backup.

6. Power Supply Unit (PSU) – The Computer's Power Source

What it does:
Supplies power to all components. A stable PSU is important for safety and performance.

What to consider:

• Wattage: 650–850 W is sufficient for most gaming builds.

• Efficiency: At least 80 Plus Gold.

• Standard: Choose ATX 3.0 if using an RTX 4000 series card.

• Type: Modular = cleaner cable management.

Tip: Always buy from a reliable brand (Corsair, Seasonic, be quiet!, EVGA).

7. Case – The Computer's Shell

What it does:
Protects and holds all components, affects airflow, noise level, and appearance.

What to consider:

• Size: ATX, Micro-ATX, or ITX depending on the motherboard.

• Airflow: Front mesh panels and good fans are important.

• Design: Glass panel, RGB, sound insulation – a matter of taste.

• Cable Management: Look for space behind the motherboard tray.

Tip: Check the case's maximum CPU cooler height and graphics card length before buying.

8. Cooling – Air or Liquid

What it does:
Keeps the CPU and sometimes GPU cool to prevent performance loss (thermal throttling).

Options:

• Air cooling: Affordable, quiet, easy to maintain.

• AIO liquid cooling: Better cooling capacity and aesthetics, but more expensive.

Tip:
Use at least two fans (one in, one out) for good airflow in the case.

9. Operating System (OS)

What it does:
The interface between you and the computer.
Most people choose Windows 11 Home or Pro for gaming.
Alternatives like Linux also work – but require more hands-on effort.

Tip:
Install via USB with the Windows Media Creation Tool. Activation is simple with a digital license.

10. Monitor, Keyboard, and Mouse

Not necessary for the build itself, but you'll need them to use the computer.

• Monitor:

  • 1080p 144 Hz for esports.

  • 1440p 165 Hz for all-around gaming.

  • 4K 120 Hz for high-end.

• Keyboard: Mechanical provides a better feel.

• Mouse: Choose the right shape and DPI for your playstyle.

Optional but Recommended:

• Extra fans – improve airflow.

• Thermal paste – sometimes included with CPU coolers.

• RGB controller – for those who want lighting.

• Anti-static wristband – for safe assembly.

Here's what a complete system looks like in practice (example 2025)