Week Six - A+ Guide to Managing and Maintaining Your PC, 7e...

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A+ Guide to Managing and Maintaining Your PC, 7e Chapter 7 Upgrading Memory
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A+ Guide to Managing and Maintaining Your PC, 7e 2 Objectives Learn about the different kinds of physical memory and how they work Learn how to upgrade memory Learn how to troubleshoot problems with memory
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A+ Guide to Managing and Maintaining Your PC, 7e 3 Memory Technologies Random access memory (RAM) – Holds data and instructions used by CPU – Static RAM (SRAM) and dynamic RAM (DRAM) • Both volatile memory Figure 7-1 RAM on motherboards today is stored on DIMMs Courtesy: Course Technology/Cengage Learning
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A+ Guide to Managing and Maintaining Your PC, 7e 4 Memory Technologies (cont’d.) Versions – DIMM, small outline DIMM (SO-DIMM), microDIMMs – RIMM and SIMM (outdated) Differences among DIMM, RIMM, SIMM modules – Data path width each module accommodates – How data moves from system bus to module
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A+ Guide to Managing and Maintaining Your PC, 7e 5 DIMM Technologies DIMM (dual inline memory module) – 64-bit data path – Independent pins on opposite sides of module – Older DIMMs • Asynchronous with system bus – Synchronous DRAM (SDRAM) • Runs synchronously with system bus • Two notches • Uses 168 pins
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A+ Guide to Managing and Maintaining Your PC, 7e 6 DIMM Technologies (cont’d.) Double Data Rate SDRAM – Also called DDR SDRAM, SDRAM II, DDR • Two times faster than SDRAM – DDR2 SDRAM • Faster than DDR and uses less power – DDR3 SDRAM • Faster than DDR2 and uses less power – DDR2 and DDR3 • Use 240 pins • Not compatible: use different notches – Several factors affect capacity, features, and performance
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A+ Guide to Managing and Maintaining Your PC, 7e 7 DIMM Technologies (cont’d.) Early single channel DIMMs – Memory controller is accessed one DIMM at a time Dual channels – Memory controller communicates with two DIMMs at the same time • Doubles memory access speed Triple channels – Accesses three DIMMs at once DDR, DDR2, DDR3 DIMMs use dual channels – DDR3 DIMMs also use triple channels
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A+ Guide to Managing and Maintaining Your PC, 7e 8 DIMM Technologies (cont’d.) Setting up dual channeling – Pair of DIMMs in a channel must be equally matched • Size, speed, features • Use same manufacturer (recommendation) Setting up triple-channeling – Three DIMM slots populated with three matching DDR3 DIMMs
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A+ Guide to Managing and Maintaining Your PC, 7e 9 DIMM Technologies (cont’d.) DIMM Speed – Measured in MHz or PC rating PC rating – Total bandwidth between module and CPU – DDR2 PC rating • Usually labeled PC2 – DDR3 PC rating • Usually labeled PC3
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A+ Guide to Managing and Maintaining Your PC, 7e 10 DIMM Technologies (cont’d.) Error-correcting code (ECC) – Detects and corrects error in a single bit – Application: ECC makes 64-bit DIMM a 72-bit module Parity – Error-checking based on an extra (ninth) bit – Odd parity • Parity bit set to make odd number of ones
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Week Six - A+ Guide to Managing and Maintaining Your PC, 7e...

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