The question then is: Do you need ECC memory? Cheap and ECC memory is sort of a conflict in terms
I have two Supermicro X7SLA-H Atom 330 boards, one running as a fileserver at home, and the other running this website (Among other things).
I have the latter running with 2x2.5" disks in RAID-1 and it uses 30W average. The fileserver at home uses about 60-65W avg. since it has 4 large powerhungry 3.5" disks.
I just use 2GB Kingston valueRAM (2x1GB).