I OCd my 2500k a few months ago (was my first successful OC attempt) and it definitely took me a while to get it stable at 4.5. It's been a while and I forgot what most of the BIOS settings do (for example LLC, PLL overvoltage c1e, c3, c6 etc). I was wondering if any of those settings can be played around with to try and hit a higher OC without changing the Vcore.