Hello Folks,
I bought an AvP Arion RGB Mid Tower Case which has 3 addressable RGB fans (Novatech link below).
https://www.novatech.co.uk/products/avp-arion-rgb-mid-tower-case/f3-330.html
Problem is that my board (MSI B450 M Mortar) has a 4 pin RGB header and the 3 RGB fans have a 3 pin end...