Paper 1 · ICT
Which of the following lists the types of computer memory from highest to lowest speed: (i) Secondary storage, (ii) Main memory (RAM), (iii) Cache memory, (iv) CPU registers?
A(i), (ii), (iii), (iv)
B(iv), (iii), (i), (ii)
C(iv), (iii), (ii), (i) ✓ Correct
D(iii), (iv), (ii), (i)
Correct answer: (C) (iv), (iii), (ii), (i) — The order from highest to lowest speed is (iv), (iii), (ii), (i), so that is the answer.
Explanation
★The order from highest to lowest speed is (iv), (iii), (ii), (i), so that is the answer.
★CPU registers are the fastest memory, sitting inside the processor.
★Cache memory is next, faster than main memory.
★Main memory or RAM is slower than cache.
★Secondary storage is the slowest of all.
★So the speed order is registers, cache, main memory, secondary storage, that is (iv), (iii), (ii), (i).
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