Ruck' 
To be honest with you, they are slightly louder than the fan in my computer.  It is not high-pitched like the computer noise but rather a low pitched hum.  I think the reason for this is because the fans are 4"ers as opposed to the 2" fans used in computers. HTH. 
 
- Chad 
		
	
		
		
		
		
			
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				Returning to the hobby after an eight year absence.
			 
		
		
		
		
	
		
		
	
	
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