The real question is did you notice a difference in your game play? 2.8 to 2.9 isn't a real big jump. I got mine to 3.2 without changing any voltages. And in most cases its the voltage increase that is going to generate the extra heat. I can get mine to 3.5 if I up some of the voltages and scale down some other things.
My opinion is that at 2.9 you won't see a difference so you might be better of putting it back to stock. Then again I am fairly new to overclocking as well so I could be full of crap. I tested mine at stock, 3.2 and 3.5. While it showed some nice differences on benchmarks I really didn't see any great increase in "real world" performance. So I would suggest doing some tests with what you will actually use the computer for and see of the performance gains are worth the extra stress you might be putting on your computer.
Remember when you increase the frequency you are overlcocking the whole system, not just the cpu.
Unless you are doing it just to do it, and there is nothing wrong with that either. I did it just to see what would happen and if I could do it. My computer actually worked pretty well for what I wanted to begin with.
If you plan on boosting it to the point where you have to change the voltages and you see decent temp increases I suggest getting an aftermarket cpu cooler and looking at the air flow in your case.
Let us know what happens.
Paul