And here is an article which seems to disprove your "rumour"....
http://www.eurogamer.net/articles/digitalfoundry-xbox-one-memory-better-in-production-hardware
Why don't we all wait until the production models are fully tested before we start believing every bit of rumour and heresay we come across?
lol@my rumour
why dont you chill abit and just realise i was sharing info that has a very good chance of being true, if some random dude said that you think i'd bring it up.