No matter how much memory your computer has, it never seems to be quite enough.

Not long ago, it was unheard of for a personal computer to have more than one or two megabytes (Mb) of memory.

Today, most systems require 64Mb to run basic applications. Up to 256Mb or more is needed for optimal performance using graphical and multimedia programmes.

The memory equation is simple: More is good, less is bad.

People in the computer industry commonly use the term "memory" to refer to random access memory (RAM).

A computer uses RAM to hold the temporary instructions and data needed to complete tasks. This enables the computer's processor (CPU) to access instructions and data stored in memory very quickly.

For example, the CPU may load an application, such as a word processing or desk-top publishing programme, into memory to allow it to work as quickly and efficiently as possible.

In practical terms, having the programme loaded into memory means you can get work done more quickly with less time spent waiting for the computer to perform tasks.

This process of putting things the CPU needs in a place where it can get at them more quickly is similar to placing various electronic files and documents into a single file folder or directory.

By doing so, you keep the files you need handy and avoid searching in several places every time you need them.

People often confuse the terms "memory" and "storage", especially when describing the amount they have of each.

Memory refers to RAM while storage refers to the capacity of the computer's hard disc.

It helps to compare your computer to an office that contains a desk and a filing cabinet.

The filing cabinet rep-resents the computer's hard disc, which provides storage for all the files and information you need in your office.

When you come in to work, you take out the files you need and put them on your desk for easy access while you work on them.

The desk is like memory in the computer. It holds the information and data you need to have handy while you are working.

Imagine what it would be like if every time you wanted to look at a document or folder, you had to retrieve it from the filing drawer. It would slow you down tremendously, not to mention drive you crazy.

With adequate desk space - our metaphor for memory - you can lay out the documents in use and retrieve information from them immediately, often with just a glance.

Another important difference between memory and storage: The information stored on a hard disc remains intact even when the computer is turned off. But any data held in memory is lost when the computer is turned off.

It's as though any files left on the desk at closing time will be thrown in the waste bin.

It has been proven adding more memory to a computer system increases its performance.

If there isn't enough room in memory for all the information the CPU needs, the computer has to set up a virtual memory file. In so doing, it reserves space on the hard disc to simulate additional RAM.

This process, known as "swapping", slows the system down.

In an average computer, it takes the CPU approximately 200 nano-seconds (ns) to access RAM compared to 12,000,000ns to access the hard drive. This is roughly equivalent to a three-and-a-half minute task taking four-and-a-half months to complete.

If you have ever had more memory added to your PC, you probably noticed a performance improvement right away.

With a memory up-grade, applications res-pond more quickly, web pages load faster and you can have more programmes running simultaneously.

In short, additional memory can make using your computer a lot more enjoyable.

It is quite easy to add memory chips to your computer yourself. Memory prices are extremely reasonable right now so, if you fancy a little more performance and don't mind getting your fingers dusty, you should explore the market place.

For more information about memory options, see Kingston Technology at www.kingston.com/ europe.