On a side note, overclocking my 2600 is impractical due to a **** gigabyte bios. The gains are not worth it compared to the increased power draw. Vdroop on this board is horrendous.
One of the builds I did used the Gigabyte X370-Gaming 3 - I can't remember the names of the options off the top of my head but I just enabled a couple of things in the advanced options - no actual manual overclocking - and it was boosting to around 4GHz (409xMHz) without any significant impact on power draw, etc. and nothing out of the ordinary voltage wise. The included cooler didn't seem to have an issue either even though supposedly it is downrated compared to the previous included one.