I highly doubt that the Dominator 8500 (1066) part will be able to hit 1120/1200 24/7 stable with reasonable voltage, if at all.
What revision of these 8500's are you using?
My dominators run stable at 1200 all damn day long
Took awhile to get them there but I can tell you it was worth the hair
The voltage part may ring true, according to Everest they need 2.20
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