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8/9/2019 Lesson 3 Motherboards Comsys
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Computer System
8/9/2019 Lesson 3 Motherboards Comsys
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` 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
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` CPU
` Chipset
` Memory
` Expansion Slots` Graphics
` Audio
` LAN
` Connectors
` BIOS
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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
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` 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
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A+ Guide to Hardware, 4e6
Figure 5-1 An ATX motherboard with PCI Express and Socket 775
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A+ Guide to Hardware, 4e7
` 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
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A+ Guide to Hardware, 4e8
Table 5-3 Buses listed by throughput
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A+ Guide to Hardware, 4e9
Figure 5-6 Four outdated bus connections on expansion cards
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A+ Guide to Hardware, 4e10
` 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)
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A+ Guide to Hardware, 4e11
Figure 5-10 How PCI Express connects to the chipset and processor
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A+ Guide to Hardware, 4e12
Figure 5-12 An audio/modem riser slot can accommodate an
inexpensive modem riser card
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` 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
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