Looking at FAQ'S and I see :
1) Core rulebook / Feats&skills section : Power Attack....If I use a 2h weapon in 1h do I get the +50% damage = YES
and
2) Core rulebook / Gear&Magic items section : Weapons, Two Handed in one hand....If your wielding in 1h even if normally a two-handed weapon = Treat as 1h for purpose of Str bonus and Power attack.
I haven't posted full faq's for simplicity but is it just me or are these not conflicting Answers??
(novice poster hence no links, sure some kind expert can assist)