[Apple] covets both the Yorkfield Extreme for its mainstream boxes and Harpertown Xeons for the next Mac Pro.
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So, the rumour says that Apple pretty much pre-booked all the amounts of top Penryn bins that could be booked for this year - especially the X548". This excludes the minimum quantities for other big vendors so that they will be able to claim at least starting to ship their stuff. Those other vendors will, in reality, mostly have to count on the "standard" Penryn speed bins, a notch or two below the top ones.
