The ECOs doesn't like that much voltage, you would gain nothing on that high voltage like 1.65v. Runing at 1.55v should be fine. I can do 900MHz with CAS 7 stable (passed 4 memtest for 20 mins) on both ASUS M4A89GTD and GigaByte 890GPA-UD3H with this voltage. Even 950MHz for 7-9-7-21-33-1T at 1.6V benchable on ASUS motherboard.
So set your TRFC to 110ns in your BIOS, and TRCD=8/9 clk for higher frequencies, that seems to be most fit for ECOs, and push your NB frequency as high as you can. It should do 2400MHz with stock CPU-NB voltage.
















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