At the risk of me too! I have a Dell T420 with eight spindles in the loft above our bedroom, plus assorted UPS, APU2 based router, switches and a mini ATX base

At the risk of me too! I have a Dell T420 with eight spindles in the loft above our bedroom, plus assorted UPS, APU2 based router, switches and a mini ATX based thing for MythTV. I screwed four lengths of 4" x 2" between two roofing joists to make two trapeziums. I then screwed a 3/4" thick sheet of chipboard to the bottom and then wrapped the top and sides in roofing felt (some protection in case of roof failure). The loft is lagged 200mm deep with 3/4" chipboard on top which deadens the noise nicely. The Dell was running the fans quite a lot today when I went up to check on something - 25C outside in Somerset, UK today.