Hi . I will give you a bit of input , but Is should preface that with the note that I ' m not the most experienced overclocker . I did overclock and undervolt several systems , but never to extreme levels or making it a hobby . A Which Motherboard would be better ? If the feature set both works you can only look for professional reviews . z 170 i n telmotherboardreviewindex 7 . html is one for the asus , z 170 extreme 4 atxmotherboard , 4337 . html is one for the ASrock . Both are good board . Do both suck at OC ? No , both don ' t suck at OC . But based on the above reviews the Asus seems to be better for that . Asus claims to have some independent clock generator for the BCLK , offers many Voltage Options and such , how about the ASRock there ? That seems to be the drawback of the Extreme 4 against the Extreme 6 , which might be the better alternative for you . However , the overclocking result of the Extreme 4 was not bad , look at how far they came and whether that is enough for you . Also , in practice all of this does not matter that much as long as you reach a stable solid clock , which you will with basically all Z 170 boards on the market . It looks like every choice is crap , even a MSI Gaming whatnot M 7 seems to have those qualitydriver problems and is unusable for me neither ancient display connectors nor Intel LAN . On amazon you will find mostly those reviews where something went wrong . Think about it , do you write about a nonexciting product like a mainboard if it works just fine ? And the Amazon support is still good , buy directly from them and you will be covered if something goes wrong . Though you could also consider buying from another shop like caseking or cyberport , the chance of getting used hardware marked as newor another scam currently happening on Amazon is lower there .