Have you tried 8.5x495-500 and manually setting gtls? Reason I ask is that I had a much easier time getting stability with lower vcore using those settings vs. 9x4xx.
I think my 745a is a very good chip, one of the best I've seen looking at tons of results. Onepagebook at OCX and a few others with 743a have similar or better performance out of theirs. And like I said earlier, my 748a took 1.36vcore to be stable at 4ghz using the same test method.
Re: ambient temps, mine are pretty low - mid 60s.




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