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The Components Of the System Unit by Mind Map: The Components Of the  System Unit
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The Components Of the System Unit

Drive bay(s)

Power supply

The power supply converts the wall outlet AC power into DC power

Some external peripherals have an AC adapter, which is an external power supply

Sound card

Video card


Core Type

Multi-core processor

Dual-core processor

Quad-core processor

Additional cooling

Heat sinks

Liquid cooling technology

The processor contains registers, that temporarily hold data and instructions

The system clock controls the timing of all computer operations


The operating system and other system software

Application programs

Data being processed and the resulting information

Types of memory

Volatile memory, RAM

Nonvolatile memory, ROM, flash memory, and CMOS, Flash memory can be erased electronically and rewritten, CMOS technology provides high speeds and consumes little power

RAM chips


Static RAM (SRAM)

Magnetoresistive RAM (MRAM)

Memory cache

L1 Cache

L2 Cache

L3 Cache

Removable flash memory

Memory cards, USB flash drives, and PC Cards/ExpressCard modules

Access time

Access time is the amount of time it takes the processor to read from memory

Main Circuit : Motherboard


Expansion Slots

Sound card and video card

Adapter Cards


Firewire port

Bluetooth port

SCSI port

eSATA port

IrDA port

Serial port

MIDI port

A port is the point at which a peripheral attaches to or communicates with a system unit (sometimes referred to as a jack)


PCI bus

PCI Express bus

Accelerated Graphics Port (AGP)

USB and FireWire bus

PC Card bus


A connector joins a cable to a port