High speed, accuracy large storage capacity, high reliability and versatility are some of the important features of computers.

Speed:

It has a very speed of executing instruction. CPU of a computer can perform more than 10 million operations per second. All the instructions are executed in accordance with a clock, whose frequency is measured in Mhz. Normally, 3-4 cycles of this clock are required to execute one instruction. Recent computers have a speed of about 300 Mhz i.e one cycle of approx.3 X 10-9 Sec. This means that it can execute an instruction in about 10 nanosec (10X 10 -8 Sec). In other words it can execute 100 million instructions in one second. But the overall speed of performance of a computer decreases due to slower Input and Output devices, interfaced to CPU.

Storage:

The speed with which computers can process large quantities of data/ Information, the size of input so also the output is quite large. The size of information to be stored further increases due to graphic applications. All this information is to be stored in auxiliary memory i.e Hard Disk fitted inside the computer. Hard Disks now days have a storage capacity as large as 4 GB. The size of internal primary memory (RAM) has also been increases a lot to about 64 MB.

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