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Q9550S stepping.

They are only E0.
What are the differences b/w the two besides the ordering code?
Which two? Do you mean the difference between the C1 and E0 revisions, or the difference between the Q9550 and Q9550S?
 
The difference b/w BX80569Q9550S and AT80569AJ073N. I'm guessing one is a retail version w/ heatsink and the other is the bare CPU / OEM version.
 
It says in the product name that one of them is boxed and the other is tray.
 
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