Where are you getting this information from? I haven't seen any hard technical specs anywhere, just "leaked" documents.
Microsoft had a slide confirming general specs today, Engadget (IIRC) had a further interview with Xbox Architects that I gathered some additional hard numbers from. They've confirmed the number of execution resources (8 independent CPU cores, 768 graphics compute units) but not clock speeds. The announcement also confirmed 8GB ram and 32MB ESRAM. They align to the leaked document, so I'm assuming the rest of the data from those is valid as well, but clock speeds especially could be subject to change.
Sony was pretty transparent about their specs when they announced PS4.