[Es2] 3 blade fan vs 4 blade fan

[coup quat]

Hi,
 
It's time for me to change my radiator. It has crack on the upper plastic cap.
My original setup is an oem radiator with 4 blade fan since the conversion. It's working really good, except the noise from 4 blade are so loud. Thinking about going back to 3 blade instead of 4 blade. I also not really sure if the 4 blade will give more flow since it might make the fan motor more work, thus lower rpm on the fan motor to turn the 4 blade fan. 
Any comment?

		
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