FULL NEWS ABOUT RAM

RAM
Random
-
Access Memory (RAM) stores programs and data currently being used by the CPU.
RAM is measured in units called bytes. Modern PC
s have many millions of bytes of RAM, so
RAM is measured in units called megabytes. An average PC will usually have anywhere from 32
megabytes to 128 megabytes of RAM, although you may see PCs with far more or less RAM.
RAM has been packaged in many differ
ent ways over the years. The most current package is
called a 168
-
pin DIMM (dual inline memory module). An older type of RAM package
-
basically
obsolete but added here for completeness
-
is called SIMM (single inline memory module). See
Figure 1

SIMMs and DIMMs come in several different physical packages. The two most common sizes of
SIMMs are 30
-
pin an
d 72
-
pin, so named for the number of metal "contacts" along one edge.
(Figure 1
-
7) It is easy to tell the difference between them, as the 72
-
pin SIMM is much larger than
the 30
-
pin SIMM. 72
-
pin SIMMs are more modern and can hold more RAM than 30
-
pin SIMMs.
72
-
pin SIMMs can also transfer information to and from the CPU faster than 30
-
pin SIMMs can

There are also three different sizes of DIMMs used by PCs: a 168
-
pin DIMM and two sizes of
smaller "SO" DIMMs: a 72
-
pin and a 144
-
pin version (Figure 1
-
. The SO DIMMs' small size
makes them very popular in laptops. Most desktop PCs sold today use only th
e 168
-
pin DIMMs,
although millions of older PCs sport SIMMs

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