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Memory size equivalences

We are thinking of replacing several 36xx machines with the new 1200's.
The 3600 machines each have either 4 or 6 mega-word memories.  From your
experiences with similar conversions, can anyone estimate the amount of
memory necessary for the 1200's to get similar performance.  By similar
performance, I mean how much memory do I need so that I page thrash about
the same fraction of the time that I do now.  I understand that this
question is not particularly well-formed but I would appreciate any
heuristic advise that is available.