I left a comment in your other thread regarding helping you out as I have same CPU/Mobo. I had mine all the way up to 4.8/9Ghz for benchies.
Make sure you have latest Bios, CPU-Z up to date along with Core Temp.
Reset back to default settings and try this.
Manually set CPU Vcore to 1.25.
Change CPU Clock Ratio to 45
Change CPU Vrin Loadline Calibration to Extreme.
Leave BLCK & Turbo Boost on Auto.
Dont apply any XMP profiles (if any) for your RAM. Leave it at stock.
Try booting with this. If you make it to windows than carry out some tasks, I don't like stress testing with Prime as its not realistic for everyday use but its up to you. If you BSOD than just restart enter bios again.
Increase Vcore by 0.01 to 1.26 and boot again to test. Make sure to watch temps while under load.
Edit: What cooler are you running ?