I actually highly doubt it, to be honest... some okes keep their consoles in little rat cages with no ventilation. Im sure that your PS3 will overheat if you crank up the cell processor for extended periods of time without proper ventilation.
Hey there, well i have noticed that it certainly makes my console make a much loader noise than normal. I have the newer xbox 360/Slim and it makes a loader noise that my old xbox 360 used to make. But as of yet after a 6 hour stint i didnt overheat