Inside the case: identifying and labelling internal components

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课程笔记

What is Computer Hardware?

Hardware refers to the physical parts of a computer, such as the CPU, RAM, motherboard, storage, graphics card, and case.
Software is a set of written instructions that can be stored and run by hardware.
Hardware is 'hard' because it is difficult to change, while software is 'soft' because it is easy to modify.
Hardware is directed by software to execute commands; together they form a usable computing system.
External devices like monitors, mice, keyboards, and speakers are also hardware.

The Computer Case

The case encloses most components of a desktop computer, providing mechanical support and protection.
It controls and directs the flow of cooling air over internal components.
The case helps control electromagnetic interference and protects against electrostatic discharge.
Large tower cases stand on the floor and offer space for multiple drives; desktop cases are smaller with less expansion room.
All-in-one designs integrate the display into the case; portable/laptop cases provide impact protection.
Case modding is decorating cases with lights, paint, or other features.

Power Supply Unit (PSU)

The power supply unit (PSU) converts AC (alternating current) from a wall outlet to DC (direct current) at lower voltages.
Most desktop PSUs meet the ATX standard.
Typical output voltages are 12V, 5V, and 3.3V.
The PSU provides power to the motherboard, drives, and other components.

The Motherboard

The motherboard is the main circuit board that connects all other components.
It has integrated circuitry and connects the CPU, RAM, disk drives, and peripherals via ports and expansion slots.
Integrated circuit (IC) chips contain billions of tiny transistors (MOSFETs).
Components are either directly attached to the motherboard or connected via slots/ports.

CPU (Central Processing Unit)

The CPU performs most computational tasks and is often called the 'brain' of the computer.
It fetches instructions from RAM, decodes and executes them, then returns results – this is the instruction cycle.
Modern CPUs are microprocessors fabricated on an integrated circuit using photolithography.
They are typically cooled by a heatsink and fan or liquid cooling.
Many CPUs include an integrated GPU (graphics processing unit), eliminating the need for a separate graphics card in basic systems.
Performance is influenced by clock speed (in GHz) and the number of cores (multi-core designs).

Buses and Chipsets

The internal bus connects the CPU to main memory using multiple lines (address, data, control).
Historically, parallel buses were used; now high-speed serial buses like PCI Express and USB are common.
The northbridge traditionally linked the CPU, memory, and high-speed peripherals; the southbridge handled slower I/O devices.
Modern architectures (e.g., Intel QuickPath, AMD Ryzen) integrate these functions into the CPU, forming a system-on-a-chip (SoC)-like design.

RAM (Random-Access Memory)

RAM stores code and data actively used by the CPU; it is volatile – contents lost when power is off.
It is organized in a memory hierarchy: registers, cache (L1, L2, L3), and main memory.
Registers are inside the CPU, fastest but very small; caches use SRAM and are faster than main memory.
Main memory uses DRAM, often DDR SDRAM (e.g., DDR4, DDR5).
Caching improves performance by prefetching frequently used data, reducing latency.

Secondary Storage

Secondary storage is non-volatile, meaning it retains data without power.
It is typically higher capacity and cheaper than RAM but slower to access.
Historically, hard disk drives (HDDs) were used; now solid-state drives (SSDs) are faster and increasingly common.
Other options include USB drives and network/cloud storage.

Expansion Cards and Cooling

Expansion cards like graphics cards and sound cards plug into motherboard slots to add functionality.
A graphics card (GPU) handles rendering images; it may be discrete or integrated into the CPU.
Cooling fans and heatsinks dissipate heat from the CPU and other components.
The case and fans manage airflow to keep internal temperatures safe.

Internal vs. External Components

Internal components are inside the case: motherboard, CPU, RAM, storage, PSU, expansion cards.
External peripherals are outside: monitor, mouse, keyboard, speakers, printer.
Ports on the motherboard/case connect internal components to external devices.
Labelling a diagram involves identifying each component and matching it to its job.

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练习题

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1.The motherboard is the main component of a computer that connects all other parts together.
Easy
True or false?
2.Which component is often described informally as the 'brain' of the computer?
Easy
- ARAM
- BCPU
- CHard drive
- DPower supply
3.RAM is non-volatile, meaning its contents are retained when the system loses power.
Easy
True or false?
4.Which of the following is NOT an internal component typically found inside a computer case?
Easy
- ACPU
- BRAM
- CMonitor
- DPower supply unit
5.Solid-state drives (SSDs) are generally faster than traditional hard disk drives (HDDs).
Easy
True or false?
6.Match each component to its primary function.
Medium
- CPU
- RAM
- Power supply
- Performs calculations
- Stores active data
- Converts AC to DC
7.The power supply unit converts direct current (DC) from the wall outlet to alternating current (AC) for the computer.
Medium
True or false?
8.Match each internal component to its primary function.
Easy
- CPU
- RAM
- Power supply unit
- Motherboard
- Executes program instructions
- Stores data and code in active use
- Converts AC to DC
- Connects all components together

复习笔记

## Inside the Case: Key Components **Motherboard**: The main circuit board that connects everything. It holds the CPU, RAM, and other parts, and provides ports and expansion slots. **CPU (Central Processing Unit)**: The 'brain' of the computer. It fetches instructions from RAM, decodes and executes them. Modern CPUs are microprocessors, often with multiple cores. They are cooled by a heatsink and fan. Clock speed (in GHz) affects performance. **RAM (Random Access Memory)**: Stores code and data in use. It is volatile (loses data when power off). Types include DDR4/DDR5. Faster than storage but slower than CPU cache. **Storage (Hard Drive/SSD)**: Non-volatile, permanent storage. SSDs are faster and becoming cheaper. Hard drives are traditional, slower. **Power Supply Unit (PSU)**: Converts AC from wall outlet (120-277V) to DC (12V, 5V, 3.3V) for the computer. Usually ATX standard. **Graphics Card (GPU)**: Handles graphics rendering. Some CPUs have integrated GPUs, but dedicated cards are for high performance. **Expansion Cards**: Add functionality (e.g., sound, network). Plug into expansion slots on the motherboard. **Cooling Fans**: Keep components cool, especially CPU and GPU. Cases direct airflow. **Computer Case**: Encloses and protects components, controls airflow, and reduces electromagnetic interference. **Buses and Ports**: Connect components. Examples: PCI Express, USB. Internal buses connect CPU to memory. **ROM/BIOS**: Non-volatile memory that starts the computer. **Key Points**: - Hardware is physical; software is instructions. - Internal components are inside the case; peripherals (monitor, keyboard) are external. - RAM is volatile; storage is non-volatile. - CPU performance depends on clock speed and cores. **Remember**: The motherboard is the hub; the CPU is the brain; RAM is short-term memory; storage is long-term; PSU provides power; fans keep cool.

Motherboard: The main circuit board that connects all components, including CPU, RAM, storage, and peripherals.
CPU (Central Processing Unit): The component that performs most computations; often called the 'brain' of the computer. It fetches, decodes, and executes instructions.
RAM (Random Access Memory): Volatile memory that stores data and instructions currently in use by the CPU; contents are lost when power is off.
Hard Disk Drive (HDD): A traditional non-volatile storage device using magnetic disks; slower than SSDs but cheaper per gigabyte.
Solid-State Drive (SSD): A faster non-volatile storage device using flash memory; no moving parts, increasingly common.
Power Supply Unit (PSU): Converts AC power from the wall outlet to DC power at lower voltages (e.g., 12V, 5V, 3.3V) for the computer's components.
Graphics Card (GPU): An expansion card that renders images and video; may be integrated into the CPU or separate for higher performance.
Expansion Card: A card added to the motherboard to provide extra features, such as sound, network, or graphics.
Cooling Fan: A fan that moves air to dissipate heat from components like the CPU and GPU.
Computer Case: The enclosure that houses and protects internal components, directs airflow, and reduces electromagnetic interference.
Bus: A communication system that transfers data between components; examples include PCI Express and USB.
ROM/BIOS: Non-volatile memory that contains firmware to start the computer and initialize hardware.
Volatile Memory: Memory that requires power to retain data; contents are lost when power is off (e.g., RAM).
Non-volatile Memory: Memory that retains data without power (e.g., ROM, HDD, SSD).

闪卡

What is the motherboard and what is its main job?

The motherboard is the main board with integrated circuitry that connects all other parts of the computer, including the CPU, RAM, disk drives, and peripherals via ports or expansion slots.

What does the CPU do?

The CPU (central processing unit) performs most computational tasks. It fetches instructions from RAM, decodes and executes them, and returns results. It is often called the brain of the computer.

How is the CPU typically cooled?

The CPU is typically cooled using a heatsink and fan or a liquid-cooling system.

What is RAM and why is it important?

RAM (random-access memory) stores code and data actively used by the CPU. It is volatile, meaning its contents are lost when power is lost.

What does 'volatile' mean in terms of memory?

Volatile means that the contents are lost when the system loses power. RAM is volatile.

What are the main types of secondary storage mentioned?

Hard disk drives (HDDs) and solid-state drives (SSDs) are the main types. SSDs are faster and becoming cheaper.

What is the power supply unit's role?

The power supply unit converts AC from a power outlet (120-277 volts) to DC at lower voltages (typically 12, 5, or 3.3 volts) for the computer's components.

What is the function of the computer case?

The case encloses and protects internal components, provides mechanical support, directs cooling air flow, and helps control electromagnetic interference and electrostatic discharge.

What is the BIOS/ROM chip?

The BIOS (Basic Input/Output System) is stored in ROM (read-only memory) and is responsible for booting the computer and providing low-level hardware control.

What are expansion cards? Give an example.

Expansion cards are add-on cards that plug into the motherboard to provide extra features. A graphics card (GPU) is an example.

What is the difference between internal components and external peripherals?

Internal components are inside the case, like the CPU and RAM. External peripherals are outside, like the monitor, keyboard, and mouse.

What is the instruction cycle?

The instruction cycle is the process where the CPU fetches program instructions from RAM, decodes and executes them, then returns results for further processing.

What does the internal bus do?

The internal bus connects the CPU to main memory using multiple communication lines divided into address, data, and control buses.

What are the three types of buses in the internal bus?

The three types are address, data, and control buses.

What is cache memory?

Cache memory is small, fast memory located between the CPU and main RAM. It stores frequently used data to reduce latency. It is typically SRAM and comes in levels like L1, L2, L3.

What is a cache miss?

A cache miss occurs when data is not found in the cache, so it must be retrieved from main memory, which is slower.

What is a multi-core CPU?

A multi-core CPU has multiple processing cores on a single chip, enabling greater parallelism and improved multitasking.

What is clock speed and how is it measured?

Clock speed is the rate at which a CPU executes instructions, measured in gigahertz (GHz). Common consumer processors range from 1 GHz to 5 GHz.

What is a solid-state drive (SSD)?

An SSD is a type of non-volatile storage that uses flash memory. It is faster than a hard disk drive and has no moving parts.

What is the role of the northbridge and southbridge?

The northbridge links the CPU, memory, and high-speed peripherals; the southbridge handles slower I/O devices like storage and USB. In modern systems, these functions are often integrated into the CPU.

What is a system on a chip (SoC)?

An SoC integrates many computer components (CPU, GPU, memory controller, etc.) onto a single chip, common in modern architectures.

What is the ATX standard?

ATX is a standard for power supply units and motherboards. Most PC power supplies meet ATX and convert AC to DC at 12, 5, or 3.3 volts.

What is case modding?

Case modding is a hobby where people decorate or modify computer cases with lights, paint, or other features.

What is the function of a graphics card?

A graphics card (GPU) processes and outputs images to a display. It is an expansion card that plugs into the motherboard.

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