Originally Posted by ZombieJon
If you have 4xSP120 as push pull intake, only take the CFM for two of them. Putting a locomotive at the front end of a train and at the rear end doesn't make it run faster.
but trains aren't a gas moving though a structure, if you're going to make this analogy, you'd have to make the trains run through a tunnel and where the cars are a volumetric measurement of gas(ie., cubic feet), and their movement is measured by how much volume is moved over a set amount of time(ie., cfm)
adding a set of fans for a push/pull does increase cooling efficiency, but the rate of increased efficiency is a logarithmic curve, meaning once you hit a certain point the rate of increased efficiency to equal the same increase takes 10 times the initial amount to increase it by a factor of 2
<_< please things about this stuff before you post, oh and adding a locomotive does increase efficiency, meaning they can go faster uphill and have better control over how fast it goes