Yep, it looks like the card is getting too hot, and CGMiner is throttling the card down to lower the heat. That's the nice thing about that CGMiner setup - more cooling = better hashrate while still keeping your card at acceptable temps.

And U: doesn't stand for Unicode. Your U: is the number of accepted shares per minute. ~7 shares per minute is right about what you'd expect for ~500MH/s, so everything is good. You don't need to increase the intensity to 13, as that may hurt performance.

LOL "I can't get my card to work right, but you should take my advise on tweaking your settings so you can be just like me!"