4.5GHz should be very doable with Devils Canyon, especially knowing that the stock turbo frequency is 4.4GHz.
I would suggest returning your bios settings to default/stock, boot into Windows and set Windows power plan to "Performance". Open CPU-Z and make note of the frequency (which be 4.4GH) and the corresponding voltage. Restart, enter the bios, set AI tweak to manual, sync all cores to 46, then set your Vcore to say 1.32v. Run RB for about an hour and monitor the temps closely, you do not want to go over 91C. If it passed RB stress testing, slowly back down the Vcore by 0.01v until it becomes unstable, then bump it up 0.01v and you should be good to go.
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