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Computer Memory

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Pictures of simms and dimms.

This is a 30 pin simm

This is a 72 pin simm

This is a 168 pin dimm

There are also a few more different types
these are just some of the basic types.

Nanoseconds and memory:

When buying memory you need to know your systems bus speed,
such as 25Mhz,100Mhz.etc.
You should also try to match your memory modules nanoseconds.
Nanoseconds is the speed that your memory can access information.
You really don't want to mix these up.That is why memory might
work in one computer but not another.

You also need to keep different types together also.
Such as: fast paging,parity,edo,etc..
Most motherboards have slots for two different kinds of modules.
simms,dimms,30 pin,72 pin,168 pin and so on.
Gets very confusing.
On top of all that your motherboard and processor voltage comes
into play with this also.2.8v, 2.4v, 3.3v,etc..

So how to you find out what kind of memory you have?

  1. Check your computers manual.

  2. Call manufacturer of computer.

  3. Take a module with you when you go to purchase.

  4. Find part number of module(part of the bar code)and call
    manfacturer of memory.

Mismatched memory might work,but not at it's best.
Can also cause alot of system errors.Maybe not right
away but they will show up.

If you look at the picture below you will see
that this module is 70 nanosecond's.Different
brands use different characters such as -7,7-,07
and so on.

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