Well, I was looking at ones with the same speed (and came out of other Poweredge 6300 servers), but I don't know about the steppings. I don't think there was much variation among the ones I was looking at. However I don't know what the description in the auction I linked above means. All it says is:
This is multiple items auction. You can buy one or all. All Processors are working pull from Dell Poweredge 6300. It will work with PE 6350 also. The picture is one of them.


It is 500/100/1MB SL3DA.
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Matt