You can connect a 3 pin fan to a 3 pin or 4 pin header on the motherboard.
													
																	Case fan 4 pin motherboard 3 pin. 
								
	
		
	
																	The fan connector will have two guides 1 and these will need to line up with the tab 2 that is on the motherboard fan header. 
																	Of course you could always upgrade the case fans to a 4 pin type so your system will potentially be quieter but the 3 pin case fans will plug right onto the the 4 pin connectors and work fine. 
																	Cooler master addressable rgb 1 to 3 splitter cable with gigabyte 3 pin argb adapter. 
																	These are the 3 pins you ll want to plug your 3 pin case fans into. 
															
													
								
	
		
	
																	Installing a 3 pin fan to the motherboard. 
																	Get it as soon as sat sep 26. 
																	Do not use it for standard 4 pin rgb or 5 pin rgbw devices. 
																	Fancasee 4 pin pwm fan power supply cable 1 to 5 splitter 5 way pc case internal motherboard fan power extension cable cord wire for atx computer case 4 pin and 3 pin cooling fans 13 inch black 4 6 out of 5 stars 594. 
															
													
								
	
		
	
																	These are the 3 pins you ll want to plug your 3 pin case fans into. 
																	If you look carefully at your motherboard s 4 pin connectors you will see a bar or marking that spans three of the four pins or that s what it is for most of them i think. 
																	Just be sure to use the 3 of 4 pins that show the span. 
																	This cable is designed for 3 pin addressable rgb led fans and addressable rgb capable motherboard only.