I guess selling them makes most sense. Removing one of the cpus and 3/4s of the ram might be necessary to bring down the power consumption for home use. Noise is not that much of an issue as it would be placed in the cellar anyway. I am about to donate one of them to my local hackspace though (they might be interested to fiddle and get their hands on server grade stuff as some of them over there do not have access to it at work), so I still wonder how to run them as energy efficient and quiet as possible with options given on the bios by Fujitsu. I will post some findings with power consumption in a separate thread or here. Thanks!

Found an x61 and an x200t at a flea market in Bremen two days ago and let my girlfriend talk me out of this 15€ purchase :D :/ I still have a 1400x1050 panel sitting in the drawer.