The Core Parts You Cannot Skip

A working PC needs seven things: a motherboard, a CPU (processor), RAM (memory), a storage drive, a power supply, a case, and a way to cool the CPU. Everything else — graphics cards, extra fans, wireless cards — is optional depending on what you plan to do.

The motherboard is the circuit board that everything plugs into. The CPU is the processor that does the calculations. RAM is the fast temporary memory your system uses while running programs. The storage drive (SSD or hard drive) holds your operating system and files permanently. The power supply converts wall power into the right voltage for each component. The case holds everything together and protects it. CPU cooling can be a fan that comes with the processor or an aftermarket cooler you buy separately.

If you skip any of these seven, the PC will not turn on or will not work. You can build a PC without a graphics card only if your CPU has integrated graphics — most modern Intel and AMD processors do — but then you cannot play demanding games or do graphics-heavy work.

Key Takeaways

  • A motherboard, CPU, RAM, storage drive, power supply, case, and CPU cooler are the only parts required to build a working PC.
  • A graphics card is optional if your CPU has integrated graphics, but necessary for gaming or professional graphics work.
  • All parts must be compatible: your motherboard socket must match your CPU, your RAM type must match your motherboard, and your power supply must have enough wattage for all components.
  • You need a Phillips screwdriver, thermal paste (usually pre-applied), and about two to four hours for your first build.

Choosing a Motherboard, CPU, and RAM That Work Together

The motherboard determines which CPU you can use. Intel CPUs fit into Intel sockets (LGA 1700 is current for newer models), and AMD CPUs fit into AMD sockets (AM5 is current). You cannot mix them. Once you pick a motherboard, that choice locks in your CPU options.

RAM compatibility is simpler: your motherboard manual will list which RAM speeds and capacities it supports. Most current boards use DDR5 RAM, though some older or budget boards still use DDR4. Buy RAM that matches what your motherboard accepts. For most people, 16 GB is enough for everyday use and gaming; 32 GB is useful if you edit video or work with large files.

A practical approach: decide your budget and what you want to do (gaming, video editing, everyday work), then search for a CPU that fits that budget and purpose. Then find a motherboard that accepts that CPU. Then pick RAM your motherboard supports. This order prevents buying parts that do not work together.

Storage, Power Supply, and Case Sizing

For storage, an SSD (solid-state drive) is now standard. A 500 GB SSD is the minimum for Windows and a few programs, but 1 TB is more practical because Windows takes up 30 to 50 GB and programs add up quickly. If you work with large video files or game libraries, 2 TB or more makes sense. SSDs are faster and more reliable than old hard drives, so there is no reason to buy a hard drive for a new build unless you need massive storage on a tight budget.

The power supply must have enough wattage for your CPU, graphics card, and all other components combined, plus a safety margin. A CPU and integrated graphics might need 400 to 500 watts. Add a mid-range graphics card and you might need 650 to 750 watts. Check the power requirements of your specific CPU and graphics card, add them together, and buy a power supply rated 100 to 150 watts higher. A power supply rated 80+ Bronze or better is more efficient and lasts longer.

The case holds everything and must fit your motherboard size. Most builds use ATX (full-size) or Micro-ATX (smaller) boards. Check your motherboard size, then buy a case that supports it. The case also needs enough space for your graphics card length and CPU cooler height — check these measurements before buying if you are using a large aftermarket cooler or a long graphics card.

Graphics Cards: When You Need One and When You Do Not

If your CPU has integrated graphics — most Intel Core and AMD Ryzen processors do — you can use the PC without a separate graphics card. Integrated graphics handle everyday tasks, web browsing, and office work fine. They also run older games and less demanding new games at lower settings.

You need a dedicated graphics card if you play new games at high settings, do 3D rendering, edit 4K video, or use machine learning tools. Graphics cards range from $150 to $2,000 depending on performance. For 1080p gaming at high settings, a mid-range card ($300 to $500) is typical. For 1440p or 4K, expect to spend more.

Graphics cards also need power. Check the card's power requirements and make sure your power supply has the right connectors (usually 6-pin or 8-pin PCIe connectors). A card that needs 250 watts will not work with a 500-watt power supply that is already powering a 200-watt CPU.

Tools, Thermal Paste, and Assembly Basics

You need a Phillips screwdriver — magnetic tips help because screws are small and straightforward to drop inside the case. Most other tools are not necessary for a basic build. Thermal paste goes between the CPU and cooler to conduct heat; most coolers come with paste pre-applied, so you do not need to buy it separately unless your cooler does not include it.

Assembly takes two to four hours the first time. The basic order is: install the power supply in the case, install the motherboard standoffs (small spacers), screw the motherboard to the case, install the CPU and RAM on the motherboard, install the storage drive, connect power cables, install the CPU cooler, and connect case fans. Watch a video for your specific motherboard model before you start — every board is slightly different.

Ground yourself before touching components to avoid static electricity damage. Touch a metal part of the case or wear an anti-static wrist strap. Do not work on carpet. Keep liquids away from the workspace.

Budget Ranges for Different Uses

A basic PC for web browsing and office work costs $400 to $600. This includes a budget CPU, 16 GB RAM, a 500 GB SSD, and integrated graphics. No graphics card needed.

A gaming PC for 1080p at high settings costs $800 to $1,200. This includes a mid-range CPU, 16 GB RAM, a 1 TB SSD, and a graphics card in the $300 to $500 range.

A 1440p gaming or video editing PC costs $1,500 to $2,500. This includes a faster CPU, 32 GB RAM, a 1 TB SSD, and a higher-end graphics card.

These are rough ranges. Prices change, and sales shift the value. Building yourself saves 20 to 40 percent compared to buying a pre-built system with the same parts.

Compatibility Checklist Before You Buy

Before ordering parts, verify these four things. First, does your CPU socket match your motherboard socket? Check the motherboard manual or product page. Second, does your motherboard support your RAM type and speed? Check the manual. Third, does your power supply have enough wattage and the right connectors for your graphics card? Add up the power draw and check the card's connector requirements. Fourth, does your case fit your motherboard size and your graphics card length? Measure or check the specs.

Use a PC parts compatibility checker like PCPartPicker to catch mismatches automatically. Enter each part and it will flag incompatibilities. This saves time and prevents buying parts that do not work together.

Frequently Asked Questions

Do I need to buy Windows or an operating system?

Windows 11 costs $120 to $200 depending on the version. You can install Windows without a license and use it free, but you will see a watermark and cannot customize some settings. Linux is free and open-source if you want an alternative. Most people buy Windows or use the free version.

What if I do not know how to install the CPU or RAM?

Both are designed to be hard to install wrong. The CPU socket has a latch that only closes one way. RAM slots have clips on the ends that only let the stick in one direction. Watch a five-minute video for your specific motherboard and you will see exactly how. Thousands of people with no experience build PCs this way every year.

Can I reuse parts from an old PC?

Sometimes. An old power supply might not have enough wattage or the right connectors for new parts. An old case might not fit a modern motherboard or graphics card. An old storage drive works but is slower than a new SSD. RAM from five years ago might not be compatible with a new motherboard. Check compatibility before reusing anything.

What is the difference between an SSD and a hard drive?

SSDs are faster, more reliable, and use less power. Hard drives are cheaper per gigabyte if you need massive storage. For a new build, buy an SSD for your operating system and main programs. If you need extra storage for files or backups, a hard drive is fine as a second drive.

Do I need extra case fans beyond what comes with the case?

Most cases come with one or two fans. For a basic build with integrated graphics, that is usually enough. If you have a graphics card or a high-end CPU, extra fans keep temperatures lower and the system quieter. Two to three extra fans ($10 to $20 each) are a common upgrade, but not required.