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Important factors to consider when choosing Processors are the clock speed (the speed at which the Processor runs), the cache speed and size, and whether we can do some Symmetric multi-processing. We will take a look at each of these individually. Clock speed in Processors is measured in megahertz, and megahertz are millions of cycles per second. So for example, if we have a Processor that runs at say 400 megahertz, that means it can process 400 million things per second. Which means that if we have 400 million and one things to do, that last one thing will have to wait until the next second. In other words, if your mom says I only have two hands, the Processor is saying say look, I only have 400 million hands this second. In the next second I will have 400 million more. Processors now though are measured in Gigahertz. Some computers have 2 Gigahertz or even more processing capability, and this will continue to increase. And Gigahertz are billions of cycles per second. So a 2 Gigahertz Processor has 2 billion hands every second. So the clock speed determines how much work that a Processor can do in one second; in other words how many hands it has. It's important to have a large enough or fast enough Processor in a Server, because this keeps from having a bottleneck caused by the Processor. In other words, if the Server needs to serve a tremendous number of clients, then it will need to do a tremendous amount of work. And some of that work will be just to keep it's own Operating System alive; other work will be for the client. But generally the faster the clock speed, the better. We will talk about some metric multi-processing in just a minute. Sometimes it's better to have more Processors instead of one faster Processor; but generally speaking the faster the Processor, the better. Very fast Processors require very efficient cooling systems, because Processors produce heat. So we will see when we install Processors, that the Processors must have their own fans in a lot of cases and will have heat sink fins which allow heat to escape from the Processor, without causing any damage to the Processor. This allows the Processor to run faster and yet stay cool. But in computers today, Processors generally don't work alone. Typically they have a helper called a cache. And what the cache does is quickly feeds the Processor information. And we will take a look at how a Processor cache works in our next section.