check these threads out:
http://www.evilgamer.net/forums/show...p?t=336&page=2
http://www.thesteelwarrior.org/forum...hp/t-8388.html
the general consensus seems to be that the hard cap (in from day 1) was changed to a soft cap sometime during luclin, and that this number didn't change.
one guy says 1300AC one guy says 1400AC. Will continue the research-
edit: I assume the 1300/1400 AC numbers are for warriors. haven't found anything about other classes/archetypes