@melgross The Sandy Bridge Xeon processors aren't out yet so you'll be awaiting for awhile. If Apple does release an updated or re-designed Mac Pro early next year, like many are hoping, it'll be based on Sandy Bridge.
If Apple just does an update, then they'll probably go with a 6-core (for single socket) & 12-core (for dual socket).
If it's a complete re-design, then my gut says they'll make it only a single-CPU version & go with the 8-core Xeon Sandy Bridge CPU.
I don't know when Ivy Bridge Xeon CPU's are coming out but from what I've read, there'll be a 12-core version, & Intel's Haswell-based CPU's will be able to sport 16 cores on a single die. So there might not be a need for a dual-socket Mac Pro
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