Changes

[[File:RAM DDR2 side-by-side.JPG|thumbnail|DDR2 RAM chips]]

[[File:RAM DDR2 side-by-side.JPG|thumbnail|DDR2 RAM chips]]

[[File:RAM DDR spiral.JPG|thumbnail|DDR RAM chips (an older type)]]

[[File:RAM DDR spiral.JPG|thumbnail|DDR RAM chips (an older type)]]

'''Random-access memory''' ('''RAM''') is a volatile form of semiconductor data storage for [[computer]] and other electronics.  Information stored in this kind of memory can be accessed and modified very quickly.  However, a small amount of constant power is required to retain information.  Also, this type of memory is relatively expensive compared to flash memory and disk drives, although this cost has decreased significantly from the early days of computers. For these reasons, it is generally used as temporary memory, which contains variables and values used by the [[operating system]] and other [[software]] for a short time.  Any valuable information stored in RAM must be copied to non-volatile memory (which does not require power to retain information) before power is disconnected from the RAM, since the RAM resets when powered off.<ref>https://www.computerhope.com/jargon/r/ram.htm</ref><ref>https://www.digitaltrends.com/computing/what-is-ram/</ref><br />

'''Random-access memory''' ('''RAM''') is a volatile form of [[semiconductor]] data storage for [[computer]] and other electronics.  Information stored in this kind of memory can be accessed and modified very quickly.  However, a small amount of constant power is required to retain information.  Also, this type of memory is relatively expensive compared to flash memory and disk drives, although this cost has decreased significantly from the early days of computers. For these reasons, it is generally used as temporary memory, which contains variables and values used by the [[operating system]] and other [[software]] for a short time.  Any valuable information stored in RAM must be copied to non-volatile memory (which does not require power to retain information) before power is disconnected from the RAM, since the RAM resets when powered off.<ref>https://www.computerhope.com/jargon/r/ram.htm</ref><ref>https://www.digitaltrends.com/computing/what-is-ram/</ref><br />

RAM chips have continued to improve over time. As a result, there are a number of varieties of RAM, which are not reverse or forward compatible. Therefore, a newer computer using DDR3 could not use DDR2 from an older device.

RAM chips have continued to improve over time. As a result, there are a number of varieties of RAM, which are not reverse or forward compatible. Therefore, a newer computer using DDR3 could not use DDR2 from an older device.

RAM chips come in seeral different sizes and shapes. Probably the most commonly used today are DIMM (seen to the right) and the more compact [[SODIMM]] chips.

RAM chips come in several different sizes and shapes. Probably the most commonly used today are DIMM (seen to the right) and the more compact [[SODIMM]] chips.

==Memory usage==

==Memory usage==

In a typical computer, there are three basic kinds of memory. The first and fastest memory storage is offered by the registers.  These are integrated into the [[CPU]], and their information can be retrieved and updated incredibly quickly. The second kind is the RAM, which is also very fast, but slower than accessing the registers. Although the signals must travel across the motherboard to and from the CPU, the RAM is generally installed right near the CPU to expedite the process. After this comes the main memory, in the form of a hard drive or solid-state drive. This is an efficient form of memory which can contain all of the device's needed information, at a relatively low cost.  In addition to these, external media can be used to offer further data storage.<br />

In a typical computer, there are three basic kinds of memory. The first and fastest memory storage is offered by the registers.  These are integrated into the [[CPU]], and their information can be retrieved and updated incredibly quickly. The second kind is the RAM, which is also very fast, but slower than accessing the registers. Although the signals must travel across the motherboard to and from the CPU, the RAM is generally installed right near the CPU to expedite the process. After this comes the main memory, in the form of a hard drive or solid-state drive. This is an efficient form of memory which can contain all of the device's needed information, at a relatively low cost.  In addition to these, external media can be used to offer further data storage.<br />