... are many kinds of memory. The evolution of memory started from 1970s. Table 1 - The evolution of memory Year Introduced Memory Speed Limit 1970 RAM/DRAM 4.77MHz 1987 FPM 20MHz 1995 EDO/BEDO 20MHz 1997 PC66 SDRAM 66MHz 1998 PC100 SDRAM 100MHz 1999 RDRAM 800MHz 1999/2000 PC133 SDRAM 133MHz 2000 DDR SDRAM 266MHz 2001 DDR SDRAM EDRAM 333MHz 450MHz 2002 DDR SDRAM 434MHz 2003 DDR SDRAM 500MHz 2004 DDR2 SDRAM 533MHz 2005 DDR2SDRAM 800MHz 2006 DDR2 SDRAM 667-800MHz 2007 DDR3 SDRAM 1066-1333MHz 3.1 1970s * Random Access Memory (RAM) was introduced in 1970s.Memory refers to the data which computers stored in binary code while random access refers to the PC processor that can access any part of the memory directly. RAM is used for storing data in computers. Unlike hard drive, it does not have read/write head to recall the memory but the data are stored in the form of integrated circuits. Therefore the transfer rate of RAM is faster than hard drive. RAM is used as the primary storage. Usually it is volatile memory where they will lose their data when the computer is shut down. RAM generally stores a bit of data as a charge in capacitor, or in the flip-flop state. * Another ...

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