Sorry, I really wouldn't like to guess how loud it will be until I had one in my possession.
Of all the 12v pumps I've heard so far, the D4's are the loudest and most annoying, with the exception of pumps that used brushed motors - but nobody would buy one of these anyway for water-cooling use. The latest muffled D4's pretty much brings them in line with the rest of the brushless pack, but still not quiet, and still with an annoying (to my ear) whine.
Most people who say that the muffled D4's are quiet tend to have a few 35dBA fans running at the same time (and are used to such noise), and for them the perception of "quiet" tends to mean quite a different thing to those who are after truly "whisper" quiet.
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