...This really sort of depends on what you NEED.
It would really help if we knew what you are cooling and what sort of temperatures you need to maintain. A PA160 has shown itself to be an excellent low noise radiator. One fan will be more quiet than (3) as long as its the same type of fan and the RPMs are within 10%. That's my opinion anyways. Do you intend to mount the rad externally regardless?
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