The vcore and rest of the settings are on auto. It's the same Vcore as stock with the 2nd core unlocked (2.8Ghz). By the way, I also tried 290x14 and It POSTS but the screen goes black when the windows loading should appear.
I've seen that option in Custom P-states but it only gives me 2000mhz-1800-1600- etc. Does that mean that 2000mhz = 10x, 1800=9x?
Try a little additional vcore....