If there isn't enough room in memory for all the information the CPU needs, the computer has to set up what's known as a virtual memory file. In so doing, the CPU reserves space on the hard disk to simulate additional RAM. This process, referred to as "swapping", slows the system down. In an average computer, it takes the CPU approximately 200 ns (nanoseconds) to access RAM compared to 12,000,000ns to access the hard drive. This would be equivalent to what's normally a 3 1/2 minute task taking 4 1/2 months to complete! RIMM is the trademarked name for a Direct Rambus memory module. RIMMs look similar to DIMMs, but have a different pin count. RIMMs transfer data in 16-bit chunks.
If your computer's CPU had to constantly access the hard drive to retrieve every piece of data it needs, it would operate very slowly. When the information is kept in memory, the CPU can access it much more quickly. Most forms of memory are intended to store data temporarily. Virtual memory is a common part of most operating sytsems on desktop computers. It has become so common because it provides a big benefit for users at a very low cost.
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