1. Objective:
On completion of this period, you would be able
to understand:
Word Length of CPU
Speed of the processor
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2. Recap
What are input and output devices?
Input device is used to enter data into a
computer.
Output device is used to display its results.
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3. Prerequisites
What is meant by bit and byte ?
 Bit: A binary digit is called a bit.
bit is the short form of binary digit.
 Byte: A group of 8 bits is called a byte.
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4. Word Length
A binary digit is called a bit
A group of 8 bits is called a byte
The number of bits that a digital computer can
process in parallel at a time is called word
length.
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5. Word Length (contd...)
 The commonly used word lengths are: 8, 16, 32
or 64 or more.
 It is a measurement to compute the power of a
computer.
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6. Word Length (contd...)
 Computer with longer word length are more
powerful.
 We say 8 bit, 16 bit or 32 bit microprocessor. It
indicates the word length.
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7. Speed
The time required for a computer to execute
basic operations.
Unit for the speed of the processor is usually in
Millions of Instructions Per Second (MIPS).
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8. Speed (contd...)
 The MIPS rating is used to specify the integer
computation performance of a processor.
 The floating point computation performance of a
processor is in millions of floating-point
instructions per second.
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9. CPUs with speed and word length
CPU CLOCK SPEED WORD LENGTH
(MHz) (Bits)
8088 4.77 8
80286 6-12 16
80386 25-40 32
80486 50-80 32
Pentium (80586) 96-200 64
Pentium Pro 100-200 64
Pentium II 233-300 64
Pentium III 350MHz-1.13GHz 64
Pentium IV 1.5GHz -3.2GHz 64
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10. Summary
In this class, we have learnt about
Definition of speed
Meaning of word length.
Different CPUs with speed and word
length.
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11. Frequently Asked Questions
1. Define speed and word length.?
2. State the relevance of speed and word length
for CPU performance?
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12. Quiz:
1. Intel’s first popular 32-bit microprocessor was
a. 80486
b. 80386
c. 80286
d. 80186
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13. Quiz:
2. The first 4-bit microprocessor is
a.4004
b.8086
c.8088
Answer: a
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