Geez, I envy everyone's i5-2500k cpus. Mine is not 45x stable (I actually can't achieve it no matter what I do). I didn't get the luck of the draw...
The most I can push out of mine is 43x with an average vcore of 1.293v. Stable using P95 Blend for about 15 hours now with no errors. But notice vcore did spike as high as 1.536v for a very brief moment. I'm going to see if this is rock solid 24 hours stable with P95 Blend (or at least see how long it remains stable).
Mind you, I won't have mine on 24/7. Maybe at most 48-72 hours straight, but that's about it.
Overall, vcore for your 43x is looking really good. Very close to stock voltage. As for me, I'm not that lucky...