What a total crock this poll is.
Everyones definition of noisy is different
Everyones setup is different, with regards to airflow.
Eveyones ambient house temprature is different.
Just these 3 variables alone will skew any data to a degree nobody will b able to determine anything, or even if there is a problem at all....
Added to that, the original forum post is referring to a US model, which as we know is a totally different beast, which at best is from a totally different manufacturing batch and in all likelyhood from a totally different manufacturing plant...
For what it's worth, mine is a 533, and I would consider the noise to be fair. It's silent initially from a distance of 3m, but after a while, there is a small amount of noise. Certainly less than my old slimline PS2.