You can use pets to see the effect of such things without respeccing. Granite gives 25 dexterity, and that adds 3.5 damage to my stats. So 0.7 damage per 5 dexterity points. Not impressive, if you ask me, so I went with passive int & str like you, and now I'm adding passive damage.
Edit:
Just want to make clear that I simply summoned Granite. JaytB below gives the pure stats without the bonus damage you get from int points. That's why the numbers are different.
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