lesson 3 motherboards comsys

8/9/2019 Lesson 3 Motherboards Comsys

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Computer System



` Multi-layered printed circuit board

` Copper circuit paths called traces carry signals

and voltages across the motherboard

` Some layers carry data for input/output while other layers carry voltage and ground returns



` CPU

` Chipset

` Memory

` Expansion Slots` Graphics

` Audio

` LAN

` Connectors

` BIOS



A+ Guide to Hardware, 4e4

` Motherboard form factor Determines the size of the board

Drives selection of power supply, case, CPU, cards

` ATX: most popular motherboard form factor

` BTX: the latest motherboard form factor

` Three types of motherboards you can select: A board providing the most room for expansion

A board suiting the computer¶s current configuration

A board falling in between current and future needs



` CPU type and speed

` Chipset

` Secondary cache

type` Types of slots

` Number of slots

` Type of memory

` Number of memory

sockets and

maximum memory

` Type of case` ROM

` Plug & Play

compatibility

` Type of keyboard




Figure 5-1 An ATX motherboard with PCI Express and Socket 775




` Some questions to ask when picking a

motherboard What form factor does the motherboard use?

Does the motherboard provide proper CPU support? What type of BIOS does the motherboard use?

Does the board fit the case you plan to use?

What is the warranty on the board?

` Embedded (on-board) component Component located on the board

Avoid board with too many embedded components

x Such boards do not easily accept add-on devices




Table 5-3 Buses listed by throughput




Figure 5-6 Four outdated bus connections on expansion cards




` The PCI buses Intended to replace the 16-bit ISA bus

Types: Conventional PCI, PCI-X, PCI Express

` On-board ports (integrated components) Examples: keyboard, mouse port, parallel printer, USB

` Internal connectors EIDE, floppy drive connector, serial ATA, SCSI, 1394

` Riser slots Audio/modem riser (AMR)

Communication and networking riser (CNR)




Figure 5-10 How PCI Express connects to the chipset and processor




Figure 5-12 An audio/modem riser slot can accommodate an

inexpensive modem riser card



` The power bus

` The front side bus

- CPU to components w/c communicates

frequently` The back side bus

-bet. the CPU and the layer-2 cache

` The Peripheral Component Interface (PCI) bus

` The Universal Serial Bus (USB)` Firewire bus

lesson 3 motherboards comsys

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