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# Computer Systems - PowerPoint PPT Presentation

Computer Systems. Nat 4/5 Computing Science Types of Computer and Performance. Lesson Aims. By the end of this lesson: Pupils at Nat 4 level will be able to: Describe and use clock speed as an indicator of performance Pupils aiming for Nat 5 will be able to

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### Computer Systems

Nat 4/5 Computing Science

Types of Computer and Performance

By the end of this lesson:

• Pupils at Nat 4 level will be able to:

• Describe and use clock speed as an indicator of performance

• Pupils aiming for Nat 5 will be able to

• Describe the uses of embedded, smartphone, laptop, desktop and supercomputers.

• Compare features of embedded, smartphone, laptop, desktop and mainframe computers:

• Discuss the type and speed of processors

Clock Speed

• Clock speed is the simplest measure of performance

• This is the amount of operations that the computer can perform in one second

• Modern home CPU’s operate in the 2.4-3.2 GHz range

• This means at least 2,400,000,000 instructions per second

Speed isn't everything

• Some processors have 2, four or six cores

• 2,3,4,6, 8 or 16 cores are the usual options

• This means that there are 2, 4 or 6 smaller processors built into a single processor.

• Each core can work on a single instruction

• The faster the processor the more heat they generate.

So which is better?

Dual core at 3.5Ghz or Quad core at 2.4Ghz?

Sometimes power is key

• Other processors might need a very low power usage

• For example using in netbooks, mobile phones or other portable devices.

Apples and Oranges

• When comparing performance it helps if the processors are of similar type etc.

• For example you cannot compare the clock speed of a Dual Core processor to that of a Quad core processor.

• The fastest supercomputer only has a clock speed of 1.6 Ghz (but it does have1,572,864 of them!)

• 1.6 Pb of RAM might help too!

Types of Computer

• As technology improves the types of computer produced change.

• Social factors also change types of popular computers

• For example laptop sales in the last few years have surpassed desktops.

• There are an increase in smart phones

• And almost every piece of equipment will have a computer ‘embedded’ inside it

Different Types of Computer

• For each type of system you need to identify:

• The features of the computer system, a purpose for each system, advantages and disadvantages for each system.

Laptop

Desktop

Smartphone

Embedded

Tablet

Mainframe

Moore's Law

• In 1965 the co-founder of Intel(Gordon Moore) made a prediction that:

• “The number of transistors incorporated in a chip will approximately double every 24 months.”

• So far this ‘law’ has held true but there are physical limits that will be reached.

• Current processors are manufactured using 32 nanometre transistors (switches)

• Intel has developed transistors so small that about 200 million of them could fit on the head of a pin

You need to be familiar with the following types of computers

• Embedded, laptop, desktop, supercomputer and smartphone

And compare them in terms of:

• Type and speed of processor

• Size of main memory

• Backing storage

• Input and output devices

Nat 4/5