About proper use of memory

A

artistnatural

New Member
I enjoy salvaging older curbside throwaway computers and making them run again. If I get enough computers I donate the newly fixed working computers to anyone who cannot afford a computer

My question is when I try to mix different SDRAM memory sticks in the computer I usually run into trouble -the memory usually does not improve -even declines.

But when I use only one stick of 128 or 256mb of SDRAM things usually go very well.

Can someone jump in and explane this result?


Will
 
the ram just clocks to the speed of the slowest stick you have installed

that's all

so if you have a fast stick and a slow stick, they'll both be slow
 
Memory does not register correctly

heyman421 said:
the ram just clocks to the speed of the slowest stick you have installed that's all
so if you have a fast stick and a slow stick, they'll both be slow
Click to expand...

I understand that sort of thing. However it is not the speed I am concerned with, it is sum total of memory adding up wrong. Example if I put in a 32mb and a 64 mb and another 32 mb memory module the total memory [/B]should [/B]register as 128mb of ram -but it does not. I often get something like 80mb total and the machine performs poorly. Yet if I put in a single memory module of 128mb the 128 registers correctly as 128 and performs well.
Why???
 
I have an older A+ certification Book and it talks of this problem, It could be the chipset (or the MCC if old enough) or the specific slots they are inserted into. Some motherboards can't function properly with three modules in at the same time. It's also simply a mystery sometimes..
 
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