Definitions please.

they're lingo, and bad lingo at that, since the normal English meanings
don't give much of a clue.  some vendors like to talk "stale up vs scale
out", which is just as bad.

let's agree to use conventionally meaningful terms. for instance, when people say capacity, I think they usually mean "primarily serial or mock-parallel (embarassingly parallel, loosely coupled)"
when they say "capability", they mean "large, tightly-coupled".

come to think of it, "throughput" is another inherently poor term, widely
used. I think people usually mean "lots of jobs per hour", but what they really mean is "lots of small jobs", since a "capability" cluster will
have high throughput as well, just bigger, fewer chunks...

I think it's pretty uncommon for people to use "capability" applied to large-memory serial machines, or fast-storage clusters. the term has connotations of "grand challenge" problems, for whatever that's worth ;)
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