by Charlie Halligan

RAM - Random Access Memory

Ram is a form of computer data storage. A random-access device allows stored data to be accessed directly in any random order. In contrast, other data storage media such as hard disks, CDs, DVDs and magnetic tape.

It was invented by Robert Dennard and the device was patented in 1968.

Ram is held on computer chips. Its called volatile memory because the contents disappear when the power is turned off. RAM memory can be altered by the used.

RAM currently comes in such sizes as 512 megabyte (MB), 1 gigabyte (GB) and 2 gigabytes. One gigabyte of RAM can cost as little as $35, and you can still get 512 megabytes of RAM for $20. The 2 GB sticks can cost $100 or more. Desktop computers come with a limited amount of slots for new RAM, usually two or three, as well as a maximum size RAM limit. Notebook RAM is smaller than desktop RAM and costs slightly more. You can get 1GB of notebook RAM for about $40.

Types of RAM

There are many different types of RAM such as:


  • SRAM: Static random access memory uses multiple transistors, typically four to six, for each memory cell but doesn't have a capacitor in each cell.
  • DRAM: Dynamic random access memory has memory cells with a paired transistor and capacitor requiring constant refreshing.