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ive thought about doing the bios change but Im due the asus strix friday next week I've been informed so will return the zotac next week unless someone locally wants to purchase it.You could always flash the bios and see how it does with a 390w power limit? Strix should let you get up to 500w with the right bios (and it’ll use it).
Assuming temps are in check I would expect a gigabyte master or OC bios to get you to above the 2ghz mark simply enough, just don’t use a bios for a 3 plug card on a card with 2 plugs.