Difference between 140mm medium speed fans and 120mm high speed fans

[Dangerer]

My exhaust fan died and I'm looking to pick up some yate loons to put in place of the open fan slots I have.

I have a choice between 140mm medium speed yate loons that are rated
Air Flow: 62 CFM
Fan Speed: 1400 RPM
Noise Level: 29 dBA

vs

120mm high speed
Air Flow: 88 CFM
Fan Speed: 2200
dB: 40


Both fans fit all sockets except my exhaust so I have to get a 120mm fan for that one, but is there any reason I should get the 140mm for the other slots? They cost twice as much and seem to move less air. Is the cost associated with the lower dB? I'll be running a sunbeam fan controller anyway to keep the dB down slightly

 

[Billb2]

I don't understand your problem???

The specs and the prices explain it all.

 

[faxon]

one is significantly quieter while still moving a lot of air. they cost more cause they require more materials to make (about 20% more) which explains the price difference. the demand is also lower for 140mm fans right now, and since yate loons only come in bulk they cost money to store until someone buys them. i would say for what i have paid for my 140mm yates, it was worth it. you using a coolermaster 690? if so loading it up with even low speed yates generates a ton of airflow through the case, almost enough to where its overkill unless you have a dual GPU + overclocked quad system running lol