What exactly was corroborated? Is it just the fact that a down clocking happened, or is it the actual amount?
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only thing confirmed so far is that there are yield problems in manufacturing... NObody has confirmed a downclock yet at all
But wasn't that video was taken down by MS?
here is the architecture video not sure when he says 768 but I believe about 25-30 minutes in and yes it was very casual, fell out of his mouth
http://www.twitch.tv/microsoftstudios/c/2315924