you cant reaaally compare ES to retail though hiwa, isnt the behaviour too different? I dont have alot of ES experience, but i tested 1 1.35v 5ghz ES and it flew to 6.5 at -115. I have not seen retails scale this good.
the only way a retail will hit 6.7+ benchable is if it is from a scaling batch and has a below normal cb, like -140 or something, which is rare ofcourse. i do hope we see ES-like scaling and CB in future retails