Your motherboard doesn't really limit how many fans you can use. It may have a fixed number of fan headers, but there are adapters to allow more than one fan to connect to a single header (though you might need to check how much power the fans need vs. how much power the header can provide), adapters to power a fan from a psu molex connector (though these usually force the fans to full speed rather than allowing pwm or voltage controls), and fan controllers that usually go into 5.25-inch drive bays that support different quantities of fans.