Well let's see...
9th level barbarian, power attacking all the way, rage, maybe bull's strength, +1 Adamantine elder-maul (or greatsword, both are 2D6 two handed weapons).
2D6 + 18 (PA) + 8(Str) +1(weapon) = average 34 points per hit, two attacks a round, makes 68 points a roundSo, this 5th...