Ram..

The clock speed generally isn't a problem. As long as it is a supported type (which also means it will fit in the slot) then it will clock to a supported speed. I have seen lots of cases where people are running PC3200 in a board that supports PC2100 max.
 
Should be fine. If you have 3 or 4 sticks, all different speed/voltage and timing it can freak the bios out if its set to auto. But even then, most of the time you can find a manual setting that will work.
 
If you can give us model numbers of the old and new systems, we can give you a better answer if the 2 will work together. If either system is custombuilt then we would need to know the model of the motherboards.
 
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