Which of the following lists the types of computer memory from highest to lowest speed:

1.Secondary storage

2.Main memory (RAM)

3.Cache memory

4.CPU registers

A1, 2, 3, 4

B4, 3, 1, 2

C4, 3, 2, 1 ✓ Correct

D3, 4, 2, 1

Correct answer: (C) 4, 3, 2, 1

Explanation

Speed falls from CPU registers to cache to main memory to secondary storage.

CPU registers sit inside the processor and are the fastest of all.

Cache memory comes next, holding recently used data close to the CPU.

Main memory (RAM) is slower than cache but faster than disk.

Secondary storage such as disks is the slowest but has the most capacity.

Cost per byte rises as speed rises up this hierarchy.

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