SIDCHG64 [options]
  /COMPNAME: New computername, ? = random hex character, * = mac address (hex)
  /F: Omit confirmation
  /R: Reboot after SID change
  /S: Shutdown after SID change
  /WS: Seconds to wait before shutdown/reboot
  /FS: Force Shutdown/Reboot without closing applications
  /NS: Don't change SID, only set computername
  /KEY: License key
  /SK: Store licence key in registry for later. SID will not be changed if /SK is specified
  /RMK: Remove license key from registry after SID change
 Following options are advanced (not for normal use):
  /CNMF: Map file /COMPNAME will be mapped against, with lines map=compname
  /OS: Windows-directory (e.g C:\Windows) of OS to modify, if not running OS
  /D: Drives to check for SID (e.g /D:CDE). Per default, SID will be changed on all local harddrives
  /SID: New SID value. Per default, SID will be set to random value
  /NW: Don't change WSUS ID
  /NPP: No Run Once-post processing. Transparent post processing is needed to preserve encrypted files and other user settings.
  /NDI: Don't reset Device ID.
  /NMG: Don't reset Machine GUID.
  /NDUID: Don't reset Dhcpv6 DUID.
  /NMA: Don't reset McAfee ID.
  /FF: Allow SID to be changed on removable drive, or for unsupported Windows version

Best usages:
 SIDCHG
 SIDCHG /COMPNAME:compname
 SIDCHG /COMPNAME:compname /F /R

Set computername after mac address:
 SIDCHG /COMPNAME=* /CNMF=map.txt      where map.txt has lines macaddress=compname

Change of computer SID risks data loss and system damage. Do not interrupt SID change in process!