Ive never really worried about batch numbers, im on my third intel quad (i7 920 DO currently), my first intel quad was a 1.2750 vid q6600 GO, 3.8ghz on air with a bit of tweaking, 2nd chip was an EO stepping q9550, 1.200 vid, 3.8ghz wih ease (1.216 vcore). My current DO i7 does 4ghz on 1.2750 vcore, i found it easier to clock than my previous q9550.


