I am going to build my first home server, and am looking for the most power efficient CPU. I haven't found direct comparisons between cheapest (presumably also better power efficient) Intel and AMD CPUs.
Any info will be appreciated.
This might help you compare efficiency
Intel : http://www.techarp.com/showarticle.aspx?artno=354&pgno=6
As a rule of thumb, the lower the numbers for TDP, Voltage, Maximum current and Fabrication process - in (nm) - the more efficient a processor is