A new desktop computer should have at least 2 gigabytes, and more if possible. Top-end PCs have up to 12 gigabytes of main memory (as of 2010).
Main memory is as vital as the processor chip to a computer system. Fast computer systems have both a fast processor and a large, fast memory. Here is a list of some characteristics of computer memory. Some characteristics are true for both kinds of memory; others are true for just one.
What do you remember about computer memory? In the table, decide what is true for main memory and for secondary memory. (Click on the buttons to see if you are correct.)