someone is going to nerdsnipe me so i will add that technically its 15 registered ports per USB controller, so you can add a dongle and have more than 15. a mobo usually only has 1 USB controller for way more than 15 USB ports though, Apple added this arbitrary restriction for no reason since none of their devices have that many ports. so a typical PC motherboard just straight up destabilizes the system lmfao

Okay but what kind of application is it used for that you exceed 15 ports filled??