Introducing my system

[M31 0]

Just had a little read, looks like I should well be able to hit 5 if I only need 1.28v to hit 4.5 fully stable. I did think I could get away with 1.25 v but after several hours of Prime one of the core's wasn't having it.

Seems that your board still has a proper bios. This has been the first UEFI board that I've used and it took me a while to like it tbh.

I did try my 2600K @ 5Ghz, that article I linked to made me do it I ran FSX without any problems for about two hours, but in all honesty to get to that holy grail of 5 GHz I was pushing the CPU voltage and heat more than I liked for decent longevity and I could see no perceivable performance gain over a more realistic long term 4.8 GHz.