I hac allready seen that chart, but was looking for something to compare it too. I ended up just looking at a generic decibel level chart
, which says that 40db(idle) is about the noise level of a library and 50db(load) is about the level of a quiet conversation.
However, this review
claims that the 4850 has an idle of 37db and a load of 40db. I have a 4850 and it's WAY louder than a library, which has me a bit confused.