Some help for a noob

[Legedi]

Attack Power to Damage is different than straight damage boost.  For Hunters, Ranged Attack Power gives them a DPS boost of about 1 DPS per 17 Ranged Attack Power.  Melee Attack Power is around 1 DPS per 10 to 12 (not sure on exact number).  So and 85 Melee Attack Power boost is going to net you around 7 to 8 DPS boost in damage which means on a 3 second weapon, the damage should increase by 21 to 24 point on a normal swing.
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Before armor. All physical attacks have to take the targets armor into acount. Most mobs seem to have between 25%-50% damage reduction I think. Casters have the least, fighters (shielded mobs, rock elemental mobs, etc.) have the most.