Mine is built around an even cheaper used Atom fanless Mini-itx board plus Nas4Free (1) which is more than enough for serving multiple full HD videos (2) around

Mine is built around an even cheaper used Atom fanless Mini-itx board plus Nas4Free (1) which is more than enough for serving multiple full HD videos (2) around the house, so speed isn't that important; the network would be the limit anyway. (1) I know it's old, but attempting a live upgrade to XigmaNas would be risky, so I'll reinstall it at the next maintenance stop. (2) as files through NFS and SMB shares, not transcoded and streamed; ie, the player does the dirty work, not the NAS.