dell optiplex 3080 sff

I have recently ordered 9 brand new Dell OptiPlex 3080's though our Dell Business rep. for our office and noticed every single one of them produces a ticking noise, and wondered if anyone else is experiencing this or has an explanation for what could be causing this. Some things to note, all the PCs have SSDs installed and NO optical drives or ... asus rog strix geforce rtx 3080