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Chapter 6

MISY160 Chapter Notes - Chapter 6: Control Unit, Hyper-Threading, Standard Raid Levels


Department
Management Information Systems
Course Code
MISY160
Professor
Ryan Rodalunas
Chapter
6

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Understanding and Assessing Hardware: Evaluating Your System
Your Ideal Computer
New technology emerges quickly: expensive extras or tools I need?
Should I upgrade my system or buy a new computer?
Things to consider
Speed
Moore’s law: CPU capacity will double every 2 years
System components: capacity of memory chips
Hard drive storage capacity
How long should I keep my computer for?
Computers usually last 2 years (even up to 4 or 5)
Depends on upgrades and system evaluations
Evaluating the CPU Subsystem
CPU: located on the system motherboard, processes instructions, performs
calculations, manages flow of information
Composed of two units:
Control unit: coordinates the activities of all other components
ALU- arithmetic logic unit: performs all arithmetic calculations and makes
logic and comparison decisions
How the CPU works
Goes through the same series of steps (machine cycle)
Fetch: fetches data from ram
Decode: decodes instruction into something the computer
understands
Execute: executes the instruction
Store: stores the result
Machine cycles per second: Hertz (Hz)
Processing power
Clock speed: dictates how many instructions the CPU can process each
second (Ghz)
Overclocking: running the CPU faster than recommended
Cores contain the parts of the CPU required for processing
Cache memory: form of ram that gets data to the CPU for processing
Level 1: a block of memory on the CPU chip
Level 2: on the CPU chip, slightly farther away
Level 3: larger in size, slower to reach
CPU Benchmarks: measurements used to compare performance
between processors
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