I am using a my old AMD Athlon 2400+ (T-bird) as a Server Box. I got RMClock installed with HTL Command [forgot that exact command]. It cools down my CPU up to 2-4*C when its idle..[So its around 52*C , bear in mind its with stock cooler and cheap chaplang fan]....Its pretty good , the downside , Windows Task Manager would report that the application uses 100% CPU Usage...[which is actually not]...Its pretty good