I have the exact same problem- can't get into windows at 46x or above-unfortunately, clearing CMOS and enabling internal PLL didn't remedy the problem. I think I've hit a multi wall at 45x with my 2600k (although I haven't tried more than 1.475 vcore).
I can also run 4.5ghz (45*100) prime stable for 12 hrs with core temps peaking in high 60's, but it requires 1.39xx vcore. Anything less throws errors or bluescreens.





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