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The first thing to do is figure out how much memory
you have.
A system's memory, or RAM, is perhaps the most important
factor next to the clock speed when determining the
overall speed of the system. Luckily, it is also one
of the cheapest and easiest to upgrade. But how does
one tell when they need to upgrade?
There are two factors to consider: type of memory,
and amount of memory.
There are two main categories of RAM, each with several
variations. Pictures are below. Current computers use
various forms of DIMMs (Dual Inline Memory Modules),
which are further subdivided into SDRAM, DDRAM, and
RDRAM.
SDRAM will be found mostly in computers of the 300
to 800 megahertz range, or in machines based around
the Celeron line of processors. Many computers built
since 2001 use DDRAM, and a very small minority use
RDRAM, which we shall not mention again.
]The other type of RAM, SIMM RAM, (Single Inline Memory
Modules) is an older standard, which has reached the
point of obsolescence. SIMMs are no longer manufactured,
but you may be able to locate then at a used-parts store,
or on ebay.
Check the Memory Upgrade
page for more help identifying what kind you have.
here is what a 72 pin SIMM looks like- these are found
on older computers:
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Next - Check Drives 
