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Generally speaking, the more memory we have and the more efficiently that we use our memory, the better off our network will be as a whole. So there are three important factors to consider in discussing memory: amount of memory, memory interleaving or dividing memory, and then memory types - different types of memory offer us different advantages. So let's discuss amount of memory first, and let's discuss how we measure memory. Memory is measured in kilobytes. But a kilobyte is not 1000bytes - a kilobyte is 2 to the power of 10, or 1024 bytes. So this can be confusing, for example 128 mb of memory actually comes out to about 131000 kilobytes. So memory can be confusing unless we realize that a kilobyte is 1024, and then it's very clear what the computer is telling us when we look at the memory. More RAM is always better - RAM is physical memory. There are two different types of memory that computers use. There is RAM, and then there is virtual memory or paging. And paging or virtual memory is using a part of the hard drive to store what would otherwise be stored in RAM. This is not nearly as fast, and in fact that information has to be moved from the hard drive into RAM before it can actually be used by the processor - this is called paging. So the more RAM that we can have, the less paging that we will need to do. And the less paging that we need to do, the faster our whole system will run. That's why it's important to have more memory in processors or in Servers. In regards to workstations, more memory is also preferable, because clients can work on more than one task if they have more memory. In other words we can multitask: we can open up many things and never close anything if we have enough memory in our computer to support all of what we are doing. And if we don't have the physical memory (the RAM) to support that and yet we still try to do that, then we will use a lot of our paging file. If we use a lot of our paging file, then we will see the performance of our system go down. So it's important to have enough memory both in clients, especially in workstations that are used for highly graphic intensive applications or AutoCAD, AutoCAM, as well as and especially as in Servers. Servers are serving the needs of many people, so they need to have a lot of memory in order to handle those needs. There are specific types of servers that need more memory than others, and we will discuss more about memory later on in this training. In general, more memory is always better. Just because more memory is better does not mean that we want to use memory in large chunks. In fact, sometimes it's better to divide memory so that we can alternate between sections of memory and therefore not have to wait. This is called interleaving memory, and we will discuss memory interleaving in our next section.