3pin fans will work fine. When you plug them in, with the key lined up they'll connect with the first 3 pins of the mobo connector, with the "PWM" pin not used. Except for the CPU fan headers, that 4th pin doesn't do anything anyway.
3pin fans will work fine. When you plug them in, with the key lined up they'll connect with the first 3 pins of the mobo connector, with the "PWM" pin not used. Except for the CPU fan headers, that 4th pin doesn't do anything anyway.