Is it ok overclocking via the bios preset?

[KaaN10]

I'm looking to OC my i5-4670k via the asrock z87 bios preset to around 4.0-4.2ghz, would this be ok?

 

[BrandonFreshMiner]

There is a tutorial on how to overclock Haswell CPUs by LinusTechTips. He is very reliable and trustworthy. Here's the link to the video: https://www.youtube.com/watch?v=0CHs5_TdpXE&feature=youtube_gdata_player
However, I don't see any problems going with a preset.