Originally Posted by Kipsofthemud
I understand you'd want pushpull on a UT60 just to squeeze out every bit of performance out of the radiator, but honestly, why would you get a UT45 and push pull just to get the a little over the UT60's push performance? Adding another 3 fans = more noise and more wattage.
I could see the wattage argument being valid if you had something like a delta fan, which has a 48watt power draw, but most fans max power draw is negligible. For example, my CM Sickle-Flow fans are 2000rpm and have a whopping 4.2watt power draw! Do give you an idea of how little that is a normal motherboard fan outlet usually has around 1amp of power supplied to it. This fan is .35amps.... I could hook to, potentially three depending on the MoBo, to a single fan header. Another example of how little it is: running ten if those fans at once would be equivalent to leaving a single light bulb on.
As to the noise, since the second set of fans is on the inside of the chassis/on the other side of the radiator so the added noise is usually slightly dampened. Beyond that, since you have better static pressure with two fans you could potentially run slower rpm(quieter) fans for equivalent performance. Fan noise doesn't scale linearly in that if I have two 14DB fans I won't have 28dBs of sound. Usually you can expect a two dB increase for every two fans you add. (assuming they're identical.
so once again considering the fan on the other side of the radiators noise should be slightly dampened, and running push/pull allows for the potential for quieter fans, the added noise can be negligible, or even non existent if you run slower fans.
by no means is push/pull a necessity but as previously stated a 45mm rad in push/pull will outperform a 60mm rad in push config. This being the case, when people ask for radiator recommendations I give them suggestions for optimal performance within their setup. This is, of course, assuming they have the option for thicker radiators. A low fin density 28mm or 30mm thick radiator's performance increase from push/pull would be negligible.Edited by ZytheEKS - 8/14/13 at 5:38pm