This comment is only for those mining from their homes.
I hope those power supplies are quieter than my 350W 1U power supplies. I had 8 1U racks in my basement at one time and it was quite a racket.
Can't comment on the noise output yet, but the fans for liquid cooling tend to be fairly low RPM, and the blade size appears to be on the large end of the scale (looks like 12cm). This will make for a lower frequency noise, which is easily blocked out by a closed door and/or the stairs from your basement.
The power supplies are the type (dimensions) that come with your average server box, so they'll be well specified for always-on operation (although not as commonly stocked if a replacement is ever needed). What that will mean for the noise output... well, with 2200W in total, it sounds as the Mk. IV unit will allow significant power headroom, such that the PSU fans won't be running at full speed. The fans are smaller in these units though, which means a higher pitched noise than your typical ATX form PSU, although in practice they tend not to be very loud at that pitch (my experience is that it's difficult to tell with a bunch of other equipment in the room drowning them out, but that's only a good indication when you think about it)
Less of an improvised design than previous ASIC's, in fact it seems that everything is being done to make it possible to talk over a room full of these things
. I'm sure there are some datacenter managers (both professional and, um, amateur) that will forever curse the BFL or Avalon approach to cooling and noise.
