RAM in a computer system

The purpose of RAM in a computer system

1.2.1 Primary Storage (memory)

Primary Storage (memory) — Note 4 of 6

What you need to know

RAM is the main working memory of a computer. It temporarily holds the operating system, running applications, and data currently being processed. More RAM allows more programs to run simultaneously without slowing down.

What to know

RAM holds the operating system, running applications, and open documents/data.
It is volatile — all contents are lost when the computer is turned off or loses power.
RAM is much faster than secondary storage, allowing the CPU to quickly access the data it needs.
More RAM means more programs and data can be held simultaneously, reducing the need for virtual memory.

Exam technique

Tip:When programs are closed, their data is overwritten in RAM by other tasks — RAM is constantly being read and written to.
Tip:For context questions (e.g. 'Give two examples of data stored in RAM for a smart TV'), be SPECIFIC. E.g. 'the currently open web browser' or 'the video currently being watched' — NOT just 'apps' or 'Netflix'.

Ready to test yourself?

Practise 1.2.1 questions

← Previous noteROM in a computer system1.2.1 Primary Storage (memory)Next note →Virtual memory1.2.1 Primary Storage (memory)

Back to Primary Storage (memory)

Revise another OCR GCSE topic: Secondary Storage, CPU performance