Ron Johnson <ron(dot)l(dot)johnson(at)cox(dot)net> writes:
> Where can I look to see (roughly) how much more RAM/CPU/disk needed when
> moving from 8.4 and 9.2?
It's entirely possible you'll need *less*, as you'll be absorbing the
benefit of several years' worth of performance improvements. But this
is such a workload-dependent thing that there's no general answer.
regards, tom lane