Some post-build updates...
Well I thought my computer was still a bit too noisy, the worst offenders seemed to be the pump, the Storm block and the hard drives.
I had a spare block of acoustic foam left over so I cut some to fit on the top part of my DDC pump, and I also put a PT gel-stuff pad underneath the pump. Can't feel any vibrations from the pump now.
I was slightly worried about the pump overheating by doing this but I measured the temperature of the bottom of the pump to be ~40°C, which seems safe enough. The top section of the pump is only in contact with the coolant so I guess you can wrap that up as much as you like. The bottom section houses the motor so I've left the sides exposed to some airflow, which seems to keep it cool enough.
I was surprised how loud the Storm CPU block is. Since it's a jet impingement block it sounds a bit like a shower head. I hollowed out another piece of acoustic foam to fit snugly over the Storm, which cuts out a fair bit of the (high frequency) noise. It's still by far the loudest part of my computer though.
My two hard drives were causing the case to vibrate quite a bit so I
elastically suspended them with some Stretch Magic cord. This really reduced the idle noise and the seek noise, especially from the Raptor. The drives run slightly hotter without the sides in contact with the case, but having some air flow over them seems to keep them cool enough.
I think I've reached the end of this project now. The only thing that still bothers me are the PSUs. I'll get fanless/modular ones next time...
