Memory

A system without memory is worse  than useless.  Random Access Memory(RAM) is a  volatile type of memory, where the stored information is lost after the PC is switched off.  In the latest PC, RAM is easily upgraded in the form of memory module or commonly called DRAMs, where they are simply easy to replace in case they are damaged.  DRAMs are assembled and packed in dual in-line memory modules (DIMMs) for desktop and small outline dual in-line memory modules (SO-DIMMs) for notebooks and each device clock and frequency is standardized.  And each time you need to increase the memory capacity of your PC you can simply pull the DIMM and replace it with  a high capacity memory.  As the processors evolved in speed and bandwidth capacity, the memory industry also took advantage of this improvements embracing the new standard in DIMMs.

Dual Data Rate (DDR) is one of the memory modules used in some motherboards.  DDR RAM is twice as fast as SDRAM with regards to the data rate.  DDR later got upgraded into double data rate 2 (DDR2) the most common type of RAM used in current and the latest PC’s.  But DDR2 DIMMS are note backward compatible with DDR RAMs.  DDR3 is the recent memory standard taking over DDR2 and its standards, with improved memory speed transfers.


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