Adding more memory.

I just added 8 MB of RAM (in two 4-MB chips) to a
pentium PC with 90 Mhz with 8 MB (also, in two 4-MB chips)
running win95 (barely moving !). All the chips are 72-pin.
The machine accepted the extra RAM ( for a total ot 16 MB ) and is working OK.
My question to the knowledgeable guys is:What are the things to consider when adding memory?, is it OK to add chips as long as they fit?, do the chips have to be installed in pairs?.
I will appreciate any comments.
TIA,
 
Efrain R Portales
Fort Worth
efrain12Asked:
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EbenBrooksConnect With a Mentor Commented:
The answer is: it depends.

In most cases, DIMMs (Dual In-line Memory Modules), i.e. the 72-pin thingies you just installed, can be installed only one at a time, but some motherboards want two at a time. SIMMs (Single In-line Memory Modules), which are hardly seen anymore, must be installed in either pairs or sets of four, depending on the motherboard.

When adding memory, it is best that all DIMMs/SIMMs be made by the same manufacturer and be of the same speed. Most DIMMs and SIMMs are 60ns (nanosecond), 70ns or 80ns. If you cannot get all modules by the same manufacturer, that's usually okay, because the memory speed is more crucial: DO NOT MIX MODULE SPEEDS! If your first DIMMs are 60ns, your next ones must be 60ns. Sometimes mixing them works, but more often it causes a heap of trouble, so don't do it.

Also, you must be grounded from static electricity discharge before installing memory. The easiest way to do this is to unplug the machine and then touch an unpainted part of the metal chassis before handling the memory or *any* circuit board.

--EbenBrooks
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efrain12Author Commented:
Thanks a lot. You've been very informative.
People like you make this web site really outstanding !.
Happy Holidays!.

Efrain R Portales
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