Core i7 Overclocking by Batch #

[The-Fox]

The production date explnation is pretty simple:
Lets take a common batch number:
3836A867

First two digits: not sure.
Second two digits: Production week.
First Letter: Batch type, A/B - we are not sure what is exactly the differeance but the rumor has it that B types requires less voltage at the same clock.
Last 3 digits: probably unit number in the batch as we have seen different CPUs with the same production week but last 3 digits were different, e.g.: 3837A905 and 3837A902.

If anyone has better info on this, feel free to correct me.