Sorry maybe I missed it, but why batch 2 and 3 have different speed ?
Is this means batch 3 has good chips while bad chip put it in batch 2 ?
Yes I know the different clock speed between 575 and 600, but WHY batch 2 can not goes to 600 while it has the SAME chips

Is this means batch 2 not stable to go to 600 ?
Seems QC drop another stage(s)...