Bester Zweihänder

displayed damage = (base damage + smithing increase) * (1 + 0.5 * skill/100) * (1 + perk effects) * (1 + item effects) 
Perk Effects = .2 * Barbarian/Armsman/Overdraw rank level

Damage =  
((Right Hand displayed Damage * (1 + Power Attack Bonus) * (1 + Dual Power Attack Bonus) * (1 + Power Attack Perk) * (1 + Dual Power Attack perk)) * Dual Power Attack Mod)
 + ((Left Hand displayed Damage * (1 + Power Attack Bonus) * (1 + Dual Power Attack Bonus) * (1 + Power Attack Perk) * (1 + Dual Power Attack perk)) * Dual Power Attack Mod)  

Power Attack Bonus = 1 if power attacking 
Dual Power Attack Bonus = 0.125 if power attacking with dual weapons 
Power Attack Perk = 0.25 if power attacking and you have Savage Strike or Devastating Blow 
Dual Power Attack Perk = 0.5 if power attacking with two weapons and you have Dual Savagery 
Dual Power Attack Mod is 2/3 for the right and 1/3 for the left hand