Since I've been on the H100i v2 version, since I changed the box and could take the other one. However, from the looks of it, it wasn't noisy. Even the one I have now, when I use four fans on it (top/bottom). If the fans are too noisy for your taste, you can always get another one. As far as the pump is concerned, I can compare it with the one I have now (it's roughly the same, just a bigger radiator) and I must admit that I don't know if it's the fans or the pump that's running. That's how stealthy it is. (The fans are at about 500 rpm, as you seem to know a lot about them, you understand that this is the minimum, and therefore very little noise.