The only reason I use 4 60 mm deltas is because I had them already. With the same dB rating and same combined CFM two 60mm fans will be louder than 1 120mm fan. I think the issue here is :
#1). Do you have spare 60mm fans already?
#2). The optimal coverage of the rad's fins. If I were using a shroud I think the fans would cover a wider area and also the dead spot in the middle. If I used maybe two 60mm and two 80mm glued as my 60mm are, directly to the rad, then there would be more rad fin area covered. Therefore being a more effiecient rad.
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