hi, my asus case fans are 3 pin and dont fit in my motherboard's fan headers. Do you know where i can get a 3 pin to 4 pin fan adaptor?
What is your motherboard model? Many modern motherboards will support 3 pin fans on their 4 pin headers, and are designed to handle both PWM and DC controlled fans via configuration settings in the BIOS. If your system is five years or less old then there's a good chance you do not need any adapters, besides which, with that type of adapter they would run at full speed anyhow no matter what you did if the board didn't support DC controls on it's 4 pin headers.