CPU Performance Quiz

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Questions and Answers

Which of the following factors does NOT directly affect CPU performance?

  • Software type (correct)
  • Clock speed
  • Number of cores
  • Cache size

What is a primary advantage of a dual-core processor compared to a single-core processor?

  • It operates at a higher clock speed.
  • It has more cache memory.
  • It can process instructions independently. (correct)
  • It is always faster in all applications.

Why might a quad-core processor not always run twice as fast as a dual-core processor?

  • Quad-core processors have less cache memory.
  • There is always a bottleneck with RAM.
  • Some applications are not optimized for multiple cores. (correct)
  • Power consumption is generally higher in quad-core models.

What is the role of cache in CPU performance?

<p>It stores frequently used instructions for faster access. (B)</p> Signup and view all the answers

Which statement about cache memory is true?

<p>It is volatile and located within or near the CPU. (D)</p> Signup and view all the answers

What does a dual core processor primarily improve in a computer's performance?

<p>The ability to perform multiple tasks simultaneously. (D)</p> Signup and view all the answers

In the context of CPU performance, what is the significance of clock speed?

<p>It indicates how many instructions a processor can execute in a given period. (D)</p> Signup and view all the answers

What does the cache in a computer do?

<p>It holds frequently and recently used instructions. (D)</p> Signup and view all the answers

During which stage of the fetch-execute cycle does data from RAM get fetched?

<p>Fetch (D)</p> Signup and view all the answers

How many cycles can a 4.2 GHz processor perform in one second?

<p>4.2 billion (A)</p> Signup and view all the answers

Which component of the CPU is responsible for performing arithmetic calculations?

<p>Arithmetic Logic Unit (D)</p> Signup and view all the answers

What is the primary function of the Control Unit in the CPU?

<p>Direct operations of the CPU (B)</p> Signup and view all the answers

Which of the following factors influences CPU performance the least?

<p>Power consumption (D)</p> Signup and view all the answers

In which year did the maximum clock speed reach 4 GHz?

<p>2012 (B)</p> Signup and view all the answers

What does the Program Counter (PC) store?

<p>The next instruction's address (A)</p> Signup and view all the answers

Which characteristic of CPUs allows them to process multiple tasks simultaneously?

<p>Number of Cores (C)</p> Signup and view all the answers

What historical trend has been observed in CPU clock speeds over the last 80 years?

<p>They have increased drastically (C)</p> Signup and view all the answers

Which component in a CPU is responsible for storing the instructions that are currently being processed?

<p>Memory Data Register (B)</p> Signup and view all the answers

What is the primary function of the CPU?

<p>To fetch and execute instructions from memory (C)</p> Signup and view all the answers

Early fixed-program computers required what to change their tasks?

<p>Physical rewiring or redesign (B)</p> Signup and view all the answers

Which of the following describes hardware in a computer system?

<p>Physical components that can be seen and touched (D)</p> Signup and view all the answers

What does the term 'fetch-execute cycle' refer to?

<p>The process where the CPU retrieves instructions from memory and executes them (A)</p> Signup and view all the answers

Who first published the concept of Von Neumann architecture?

<p>John von Neumann (C)</p> Signup and view all the answers

Which of the following is NOT a characteristic of early fixed-program computers?

<p>They could easily be repurposed (A)</p> Signup and view all the answers

In the context of computer systems, what is considered software?

<p>The set of instructions and programs that the CPU executes (D)</p> Signup and view all the answers

What is a common task of input devices in a computer system?

<p>Receiving data for processing by the CPU (C)</p> Signup and view all the answers

What is the primary function of the Control Unit (CU)?

<p>Send signals to direct CPU operations (A)</p> Signup and view all the answers

Which of the following is NOT one of the five registers in a CPU?

<p>Arithmetic Register (AR) (A)</p> Signup and view all the answers

What roles do the Arithmetic Logic Unit (ALU) perform?

<p>Perform arithmetic and logical operations (B)</p> Signup and view all the answers

Which register holds the address of the memory location to be accessed?

<p>Memory Address Register (MAR) (B)</p> Signup and view all the answers

In the context of CPU architecture, what does the term 'Cache' refer to?

<p>A fast storage area for frequently accessed data (B)</p> Signup and view all the answers

Which component of the CPU is comparable to a conductor in an orchestra?

<p>Control Unit (CU) (C)</p> Signup and view all the answers

Which of the following statements accurately describes the Memory Data Register (MDR)?

<p>It stores data to be written to or read from memory. (B)</p> Signup and view all the answers

Which operation is specifically performed by the Arithmetic Logic Unit (ALU)?

<p>Executing AND, OR, and NOT operations (A)</p> Signup and view all the answers

What is a key characteristic of embedded systems?

<p>They perform a limited number of functions. (C)</p> Signup and view all the answers

Which of the following is NOT an example of an embedded system in cars?

<p>Computer operating system (D)</p> Signup and view all the answers

What is the primary function of an engine control unit in a car?

<p>To manage the engine's performance (A)</p> Signup and view all the answers

In terms of power usage, how are embedded systems typically designed?

<p>To operate from small power sources (C)</p> Signup and view all the answers

How many main components are typically found on the circuit board of an embedded system?

<p>Three (B)</p> Signup and view all the answers

Which system is specifically designed to automate the task of parking a vehicle?

<p>Automatic parking system (D)</p> Signup and view all the answers

What differentiates embedded systems from general-purpose systems?

<p>Embedded systems are built into other devices for specific tasks. (B)</p> Signup and view all the answers

Which of the following best describes the integration of embedded systems?

<p>They fit into a device as part of a larger machine. (D)</p> Signup and view all the answers

Flashcards

What is the purpose of the CPU?

The Central Processing Unit (CPU) is the brain of a computer. It fetches instructions from the memory and executes them.

What is the fetch-execute cycle?

The fetch-execute cycle is a continuous process where the CPU fetches instructions, decodes them, and executes them.

What is hardware?

Hardware refers to the physical components of a computer system that you can touch, such as the keyboard, monitor, and motherboard.

What is software?

Software refers to the set of instructions that tell the hardware what to do. It's the invisible part of a computer system.

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What is an input device?

An input device allows you to enter data into a computer, such as a keyboard, mouse, or scanner.

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What is an output device?

An output device displays or presents information from the computer, such as a monitor, printer, or speaker.

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What were fixed-program computers?

Early computers were built to perform specific tasks. Reprogramming them required physical changes, which was difficult and time-consuming.

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What is the Von Neumann architecture?

The Von Neumann architecture allows data and instructions to be stored in the same memory location, making computers more flexible and versatile.

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Dual-Core Processor

A CPU with two processing units that can operate independently, allowing the computer to handle multiple tasks simultaneously. Each core can execute a separate set of instructions.

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Single-Core Processor

A CPU with a single processing unit. It can only execute one instruction at a time, making it less efficient for multitasking.

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Clock Speed

The speed at which a CPU can execute instructions, measured in Hertz (Hz). A higher clock speed generally means the CPU can perform more operations per second.

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Cache

A small, high-speed memory located within the CPU that stores frequently accessed data and instructions. Accessing data from the cache is faster than accessing it from main memory (RAM).

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Number of Cores

The number of processing units (cores) within a CPU. More cores generally mean better performance for multithreaded applications.

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Control Unit (CU)

The part of a CPU that controls the flow of instructions and data, acting like the brain of the computer. It interprets instructions and decides how to perform tasks.

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Arithmetic Logic Unit (ALU)

The part of a CPU that performs both arithmetic operations (addition, subtraction, etc.) and logical operations (AND, OR, NOT). It's like the calculation center.

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Registers

Small, high-speed memory locations within the CPU used for storing data temporarily during calculations. They're super fast to access and act like a short-term memory.

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Von Neumann Architecture

A type of CPU architecture where instructions and data are stored in a single memory location, which involves the CPU accessing the same memory for both.

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Program Counter (PC)

A special register in the CPU that holds the address of the next instruction to be executed. It’s like the instruction pointer, guiding the flow of instructions.

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Memory Address Register (MAR)

A register in the CPU that holds the memory address of the data to be accessed. It's like a memory address finder, allowing the CPU to locate specific data pieces.

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Memory Data Register (MDR)

A register in the CPU that temporarily stores the data that’s being fetched from or written to memory. It's like the data carrier, transporting data between the CPU and memory.

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MAR (Memory Address Register)

A register that temporarily holds the address of the data or instruction to be accessed in memory.

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MDR (Memory Data Register)

A register that temporarily holds the data or instruction that has been fetched from memory.

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Multi-core Processor

A processor that contains multiple processing cores, allowing it to perform multiple tasks simultaneously.

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Cache Size

A small, fast memory inside the CPU that stores frequently used data and instructions, improving access speeds.

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Embedded Systems

A computer system that is built into another device and performs limited, specific tasks.

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Characteristics of Embedded Systems

A computer system that is built into a device and performs a specific set of tasks. Its components, including the processor, memory, and input/output interfaces, are integrated onto a single circuit board.

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Low Power Consumption

Embedded systems are designed to operate with low power consumption, typically powered by small batteries or energy sources.

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Limited Functions

They perform one or a few specific tasks, unlike general-purpose computers which can be used for a wide variety of tasks.

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Part of a Larger Machine

Embedded systems are incorporated into larger devices and function as part of a larger machine.

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Single Circuit Board

They typically have their processor, memory, and input/output interfaces integrated onto a single circuit board.

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Embedded Systems vs. General-Purpose Systems

These systems perform specific tasks within larger devices, unlike general-purpose computers that have a wide range of applications.

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Examples of Embedded Systems

Embedded systems are everywhere! From your car's engine control unit to your washing machine's timer, they play a significant role in modern technology.

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Study Notes

Chingford Foundation School

  • Vision: Building ambition for all.
  • Mission: A community where students strive to be the best version of themselves.
  • Core Values: Achievement, Resilience, Unity

CPU Architecture

  • Purpose: The Central Processing Unit (CPU) fetches and executes instructions stored in memory.
  • Fetch-execute cycle: The CPU executes program instructions through the fetch-execute cycle, also known as the fetch-decode-execute cycle. This cycle involves fetching instructions from RAM, decoding the instructions, executing the instructions, and repeating the process.
  • Components: A CPU includes the Control Unit (CU), Arithmetic Logic Unit (ALU), registers (ACC, MAR, MDR, PC, CIR), and cache.
  • Registers: Small memory locations within the CPU that store instruction addresses (PC), addresses of data or instructions being processed (MAR), data or instructions fetched from memory (MDR), and results of arithmetic calculations (ACC).
  • Memory: Storage location - a place in RAM where a single piece of data is stored; Address - a number assigned to a storage location in RAM so that it can be accessed.
  • Operations: The ALU performs arithmetic calculations (+, -, /, *) and logical operations (AND, OR, NOT).
    • The CU sends signals to direct CPU operations; decodes instructions.
  • CPU Performance: Factors: Clock speed, Number of Cores, Cache size.
    • Clock speed - number of cycles per second, measured in Gigahertz (GHz).
    • Number of cores - Multi-core CPUs have more than one CPU. Each core has its own CU, ALU and registers to enable multitasking and parallel processing.
    • Cache - high-speed memory that stores frequently used instructions and data. It's located close to the CPU and has faster access time.

Embedded systems

  • Definition: An embedded system is a computer system built into another device.
  • Characteristics: Limited functions, part of a larger machine, single circuit board, low power.
  • Examples: Washing machines, digital cameras, microwaves, ATMs, calculators, car lights, satellite navigation systems, automatic parking in cars and air bag control.
  • General-purpose systems vs. embedded systems: General-purpose systems perform multiple functions, have multiple chips combined and are self-contained; Embedded systems perform one or few functions, are single-chip and are also usually parts of larger systems.

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