There was a post in the RB forum about 333 being deleted in a version around .32 and added back later.
Can’t seem to locate it in the change logs. (Grrr).
settings are in the routerboard menu or in the bios. yes, only newer batches have this setting. i don’t believe we have shipped those yet.
some very first boards also had this setting, but it doesn’t work.
there are no known issues with the new boards, slight heat increase could be the only one.