O-LevelComputer ScienceHardware2210/12 · Oct/Nov 2023 · Q36 Marks
A user’s computer has a central processing unit (CPU) that has a clock speed of 2 GHz. She wants to change it to a CPU that has a clock speed of 3 GHz.
- (a)(i)State what is meant by clock speed.[1]
- (a)(ii)Explain the effect this change will have on the performance of the CPU.[2]
- (b)The CPU contains a memory address register (MAR). Describe the role of the MAR in the fetch–decode–execute cycle.[2]
- (c)The CPU has a list of all the machine code commands it can process. State the name of this list of commands.[1]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2023). The mark or mark type is shown in brackets.
- [1] The maximum number of FDE cycles/instructions a CPU can perform/process/execute in a second
- [2] Increases/improves the performance // Tasks can be performed quicker/faster // because more FDE cycles/instructions can be processed in a second
- [2] Stores addresses // of next instruction/data to be fetched // where data is to be written to
- [1] Instruction set
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