After well over 2 years my old single core 1GHz Intel motherboard with 1GB memory and Windows XP cannot cope with the Domotica and webserver tasks that is has to fullfill. Therefore it's beiing replaced by a brand new server.
After some reading i decided to buy the components below:
Motherboard: ASRock Q1900-ITX (with onboard quad core 2GHz J1900 processor)
Memory: Kingston ValueRAM KVR16LS11/4
PSU: Mini-box picoPSU 90 + 80W Adapter Power Kit
SSD: Crucial MX100 256GB
HDD: Samsung Spinpoint F3 HD103SJ, 1TB
I hope that this setup will be even more energy efficient then my old setup, and that my website will be running much faster again.
For now its still a bit slow (specially the temperature page), i hope to fix this very soon