You will have to go to Gigabyte's web site and see if you can locate the owner's manual for the motherboard. Manuals usually have a diagram that show the location and type of motherboard fan connections. The number of fan connections on a motherboard vary. Again, you will have to check the manual.
Fan connections on motherboards may be either 3 or 4 pin connections. You can use a 3 pin fan power cable with a 4 pin fan connection on the motherboard.
Modern cases come with quite a few fans. It is not unusual for a case to have more fans that there are connections on a motherboard. The extra fans can be connected directly to a power supply by means of a fan cable adapter that converts a 3 or 4 pin fan connector into a 4 pin molex connector. You can even daisy chain the fans and connect them to a single connection on the power supply.