RAM

(Random Access Memory)

       The most common type of memory is called random access memory (RAM). As a result, the term memory is typically used to mean RAM. RAM is like an electronic scratch pad inside the computer.RAM holds data and program instructions while the CPU works with them. When a program launched, it is loaded into and run from memory. As the program needs data, it is loaded into memory for fast access. As new data is entered into the computer, it is also stored in memory but only temporarily.

SIMM 30 Pins                                (Use in 8086--------------------------80586 computers)

SIMM 72 Pins                                (Use in 80386--------------------Pentium II computers)

DIMM or SD Ram (168 pins)       (Use in Pentium I---------------Pentium IV computers)

DDR I (184 Pins)                           (Use in Pentium IV computers)

DDR II (240 Pins)                          (Use in Pentium IV computers)

DDR III (200/240 Pins)                 (Use in Pentium IV Advanced computers)

RD (184 Pins)                                (Use in Pentium IV computers)

SIMM

SD or DIMM

RD

DDR-I

DDR-II

DDR-III

SIMM    =  Single inline Memory Module
DIMM    =  Dual inline Memory Module 
RD        =  Rambus Dynamic Random Access Memory
SD        =  Static Dynamic or Standard Dynamic
DDR     =  Double Data Rate or Double Data Raw