OK, I have 2 i920's with identical batch numbers guys, one of them can do 4GHz with 1.264v Vcore, but the other one needs 1.315v.

I really don't know why people try to get CPU's from specific batches anymore, as it would appear that there are lemons in every batch.

I have seen people with chips from the same batch as my last one, and it was extremely poor, yet they are running them at 4.2GHz+ with nice voltages and temps... I just don't get this whole batch thing at all..