The cooler is compatible with socket AM5. All Noctua coolers supporting socket AM4, including this one, are compatible with AM5, often without the need for an additional adapter, as AM5 uses the same mounting system as AM4. The NH-U9S chromax.black officially supports AM4 and AM5 from 2019 according to the manufacturer's datasheet. If required, an AM5 adapter mounting kit can be supplied free of charge by Noctua for certain models, but in this particular case it is generally not required.