A+ Guide to Managing & Maintaining Your PC, 8th Edition Chapter 4 All About Motherboards Objectives • Learn about the different types and features of motherboards • Learn how to use setup BIOS and physical jumpers to configure a motherboard • Learn how to maintain a motherboard • Learn how to select, install, and replace a motherboard A+ Guide to Managing & Maintaining 2 Your PC, 8th Edition © Cengage Learning 2014 Part 2 Buses and Expansion Slots • Bus – System of pathways used for communication • Carried by bus: – Power, control signals, memory addresses, data • Data and instructions exist in binary – Only two states: on and off • Data path size: width of a data bus – Examples: 8-bit bus has eight wire (lines) to transmit A+ Guide to Managing & Maintaining 3 Your PC, 8th Edition © Cengage Learning 2014 •Bit: A bit is the basic unit of information in computing and digital communications. A bit can have only one of two values, and may therefore be physically implemented with a two-state device. The most common representation of these values are 0 and 1. The term bit is a contraction of binary digit. •Byte: A byte is a unit of digital information in computing and telecommunications that most commonly consists of eight bits. •bps: bit rate, bit per seconds •Hz: (Hertz): It is defined as the number of cycles per second of a periodic phenomenon. The hertz is equivalent to cycles per second. •Radio frequency radiation is usually measured in kilohertz (kHz), megahertz (MHz), or gigahertz (GHz) A+ Guide to Managing & Maintaining 4 Your PC, 8th Edition © Cengage Learning 2014 Size 1 Byte = 8bit 1024 Bytes = 1 KB KB = Kilobyte 1024 KB = 1 MB MB = Megabyte 1024 MB = 1 GB GB = Gigabyte 1024 GB = 1 TB TB = Terabyte 1024 TB = 1 PB PB = Petabyte Bit rates Name Symbol Multiple Decimal prefixes (SI) kilobit per second kbit/s 103 megabit per second Mbit/s 106 gigabit per second Gbit/s 109 terabit per second Tbit/s 1012 Multiples of bits Decimal Binary Value Metric Value JEDEC IEC 1000 kbit kilobit 1024 Kbit kilobit Kibit kibibit 1000^2 Mbit megabit 1024^2 Mbit megabit Mibit mebibit 1000^3 Gbit gigabit 1024^3 Gbit gigabit Gibit gibibit 1000^4 Tbit terabit 1024^4 - - Tibit tebibit 1000^5 Pbit petabit 1024^5 - - Pibit pebibit 1000^6 Ebit exabit 1024^6 - - Eibit exbibit 1000^7 Zbit zettabit 1024^7 - - Zibit zebibit 1000^8 Ybit yottabit 1024^8 - - Yibit yobibit A+ Guide to Managing & Maintaining 5 Your PC, 8th Edition © Cengage Learning 2014 Figure 4-16 A data bus has traces or lines that carry voltage interpreted by the CPU and other devices as bits A+ Guide to Managing & Maintaining 6 Your PC, 8th Edition © Cengage Learning 2014 Buses and Expansion Slots • System clock (system timer) – times activities on the motherboard • Speed of memory, Front Side Bus, processor, or other component is measured in hertz (Hz), which is one cycle per second – Megahertz (MHz): one million cycles per second – Gigahertz (GHz): one billion cycles per second • Motherboards can have more than one bus – Table 3-4 on the following slide lists many buses A+ Guide to Managing & Maintaining 7 Your PC, 8th Edition © Cengage Learning 2014 front side bus (FSB), back side bus . The memory bus The IDE or ATA bus connects The AGP bus connects The PCI bus connects A+ Guide to Managing & Maintaining 8 Your PC, 8th Edition © Cengage Learning 2014 • Front Side Bus (FSB) OR CPU Bus is the bus that carries data between the CPU and the northbridge. • Depending on the processor used, some computers may also have a back-side bus that connects the CPU to the cache. This bus and the cache connected to it are faster than accessing the system memory via the front side bus. FSB speed 2600 MHz, 2000 MHz, 1600 MHz, 1333 MHz, 1066 MHz, 800 MHz, 533 MHz, or 400 MHz. A CPU operates from 166 MHz to almost 4 GHz. • The amount of data that a CPU can process at the one time depends on the size of the front side bus (FSB). The wider the processor data bus width, the more powerful the processor is. Current processors have a 32-bit or a 64-bit processor data bus . • Back Side Bus connects the CPU with the level 2 (L2) cache, also known as secondary or external cache. The processor determines the speed of the back side bus. • Memory bus connects the northbridge to the memory. Common ratings for memory are 800 MHz, 1066 MHz,1333 MHz and 1866 MHz • IDE or ATA bus connects the southbridge to the disk drives. • AGP bus connects the video card to the memory and the CPU. The speed of the AGP bus is© usuallyCengage Learning 66 MHz.2014 Table 3-4 Buses listed by throughput A+ Guide to Managing & Maintaining 10 Your PC, 8th Edition © Cengage Learning 2014 Buses and Expansion Slots • Conventional PCI – Improved several times – Four types of slots and six possible PCI card configurations A+ Guide to Managing & Maintaining 11 Your PC, 8th Edition © Cengage Learning 2014 Buses and Expansion Slots • PCI-X – Uses 64-bit data path – Latest revision is PCI-X 3.0 (all revisions are backward-compatible) Figure 4-19 The two long white PCI-X slots can support PCI cards A+ Guide to Managing & Maintaining 12 Your PC, 8th Edition © Cengage Learning 2014 A+ Guide to Managing & Maintaining 13 Your PC, 8th Edition © Cengage Learning 2014 A+ Guide to Managing & Maintaining 14 Your PC, 8th Edition © Cengage Learning 2014 Buses and Expansion Slots • PCI Express (PCIe) – Not backward compatible with conventional PCI or PCI-X – Expected to replace both PCI and PCI-X in the future – Uses a serial bus, which is faster than parallel – Comes in four different slot sizes • PCI Express x1, x4, x8, and x16 – Latest version is PCIe 3.0 which doubles the throughput of version 2.0 A+ Guide to Managing & Maintaining 15 Your PC, 8th Edition © Cengage Learning 2014 A+ Guide to Managing & Maintaining 16 Your PC, 8th Edition © Cengage Learning 2014 Figure 4-21 Three types of PCIe slots and one conventional PCI slot A+ Guide to Managing & Maintaining 17 Your PC, 8th Edition © Cengage Learning 2014 PCI/e x16 PCI/e x1 2xPCI slot PCI/e x4 PCI/e x8 A+ Guide to Managing & Maintaining 18 Your PC, 8th Edition © Cengage Learning 2014 dual monitor PCI express graphics card USB 3.0 with x1 Dual monitor PCI Express graphic PCI Express graphic card with 16x card with 16x A+ Guide to Managing & Maintaining 19 Your PC, 8th Edition © Cengage Learning 2014 Buses and Expansion Slots • PCI Riser cards – Installs in a PCI slot and provides another slot at a right angle – Used to fit PCI, PCIe, and PCI-X Figure 4-23 PCI riser card provides a cards into a low- 3.3-V slot or 5-V slot depending on profile or slimline which direction the card is inserted in case the PCI slot A+ Guide to Managing & Maintaining 20 Your PC, 8th Edition © Cengage Learning 2014 Buses and Expansion Slots • AGP Buses – Accelerated Graphics Port (AGP) – standard used by motherboard video slots and video cards for years – Will need to know how to support it even though it is a dying technology – AGP standards include: • Three major releases - AGP 1.0, AGP 2.0, AGP 3.0 • One major change in slot length – AGP Pro • Four different speeds – 1x, 2x, 4x, and 8x • Three different voltages • Six different slots A+ Guide to Managing & Maintaining 21 Your PC, 8th Edition © Cengage Learning 2014 Table 3-5 AGP standards summarized A+ Guide to Managing & Maintaining 22 Your PC, 8th Edition © Cengage Learning 2014 A+ Guide to Managing & Maintaining 23 Your PC, 8th Edition © Cengage Learning 2014 A+ Guide to Managing & Maintaining 24 Your PC, 8th Edition © Cengage Learning 2014 On-Board Ports and Connectors • On-board ports (integrated components) – Ports coming directly off the motherboard • USB, sound, network, video, eSATA ports • Older motherboards might have mouse and keyboard ports, parallel and serial ports • I/O shield – Plate installed in computer case providing holes for on-board ports • Internal connectors – Parallel ATA, floppy drive, serial ATA, SCSI, USB or FireWire (IEEE 1394) connectors A+ Guide to Managing & Maintaining 25 Your PC, 8th Edition © Cengage Learning 2014 Configuring a Motherboard • Motherboard settings – Enable or disable connector or port – Set CPU frequency, system bus, other buses – Control security features – Control what happens when PC first boots • Three ways to configure older motherboards: – DIP switches, jumpers, CMOS RAM • Today, almost all motherboard configuration data is stored in CMOS RAM – Program called BIOS setup or CMOS setup is used to make changes to settings stored in CMOS RAM A+ Guide to Managing & Maintaining 26 Your PC, 8th Edition © Cengage Learning 2014 Using Jumpers to Configure a Motherboard • Jumper – two small posts or metal pins that stick up off the motherboard that is open or closed – Open jumper has no cover and a closed jumper has a cover on the two pins – Retain setup or installation information – Jumpers can be used to clear a forgotten supervisor or power-on password A+ Guide to Managing & Maintaining 27 Your PC, 8th Edition © Cengage Learning 2014 Figure 4-35 This group of three jumpers controls the BIOS configuration Figure 4-36 BIOS configuration jumper settings A+ Guide to Managing & Maintaining 28 Your PC, 8th Edition © Cengage Learning 2014 Using Setup BIOS To Configure a Motherboard • Access the BIOS Setup Program – Press a key or combination of keys during the boot process • Varies from one manufacturer to another • See documentation for your motherboard or watch the screen near the beginning of the boot – Setup screen appears with menus and Help features A+ Guide to Managing & Maintaining 29 Your PC, 8th Edition © Cengage Learning