PC Components: an interactive computer hardware course

PC Components is an interactive computer hardware course that takes a gaming PC apart and explains every part. In 36 sections it covers the CPU, its cores, threads and clock speed, the fetch, decode, execute cycle, cache, RAM, hard drives and SSDs, the GPU, the motherboard, sizes and compatibility, the power supply, cooling and airflow, overclocking, booting, and the buses and bottlenecks that link it all.

It opens with a 3D PC that comes apart in an exploded view, lights up each part with what it does and rebuilds itself. Most sections then put real numbers on that part, so you can compare specs instead of trusting the box.

What the course covers

Processing and memory

A CPU core runs instructions in the fetch, decode, execute cycle; more cores help work that splits up, and a higher clock speed helps work that cannot. Because a trip to RAM takes hundreds of clock ticks, the CPU keeps recent data in fast on-chip cache. RAM holds what is running, and its bandwidth doubles in dual channel. Our guides to random access memory and storage devices go deeper on both.

Graphics, boards and power

A GPU has thousands of simple cores for drawing millions of pixels at once. The motherboard joins every part, and parts must match: the CPU socket, the RAM type, the board size and the power plugs. The power supply should cover the full-load draw plus about 30% headroom, and almost every watt ends up as heat that the coolers and case fans must carry away.

Pushing it further

Overclocking runs a part faster than rated, but power rises faster than speed because voltage counts twice, roughly P ∝ V²f. The course explains binning, why two chips of the same model overclock differently, and how to push safely in small steps while watching temperatures.

Try a question from the course

Match the CPU to the work. A video export splits into many chunks that can run at once, so more cores win: a 16-core CPU at 4.5 GHz beats an 8-core at 5.0 GHz. Much of a game's logic runs on one thread, so there the faster clock wins instead.

Now pick the better CPU for a new job, then press Mark to check your answer in the course.

Who this course is for

• First-time PC builders who want to choose parts with confidence and avoid incompatible ones.
• GCSE and A-level computing students revising the CPU, cache, memory, storage and the fetch, decode, execute cycle.
• Gamers and creators who want to know which upgrade will actually make a difference.

What you need to know first

The course page suggests the Binary, Hexadecimal & Decimal course first, since bits and bytes come up throughout. A few practices use simple multiplication and division with GB/s and watts.

How long it takes

There are 36 sections and most take a few minutes. Learners without a plan can open two sections of a course a day, in order, so the whole course takes 18 days. A plan removes the daily limit and lets you go straight to any part, such as power supplies or overclocking.

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