Seems to me, if I recall correctly from my days flying the S-58T, 100%Q @100% RRPM would cause the engines to put out 1625 h.p. while 100%Q @93% RRPM would produce 1525 h.p. So that extra 7% RRPM gave us an extra 100 h.p.
But like a lot of things that I *think* are stored away in the memory, it may be incorrect.