I'm pretty sure it's every 100 points you get gives you a new bar. Everyone starts with 1 bar and 10 points. So when you get to 100 points, you get your second bar. 200 points gets your third and so on.
Your reputation power is more of a calculation of amount of time on the forum, your post total, reputation received etc etc. That doesn't affect your own personal bars, but it does influence how many points you give/take away from a user when you give them rep.
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