 So I'm in the middle of setting up my heat sink test bench. This is going to be an X79 platform with the GTX 580 as well as a Vengeance C70 case because it will allow me to easily mount tall air cooling heat sinks, dual radiator, sort of all in one units like the H100, as well as single radiator all in one unit such as the H80. So the reason I'm setting this up is so that I can do some testing but while I was working on getting it going I pulled my H100 off of my test bench and I noticed something that I wanted to sort of talk about. So I get a lot of questions about should I use my fans in push. You can see this is configured in push. The blades are going to be rotating this way pushing air through the fins of the radiator out the other side. Or do I want my fans in pull which is where you'd flip them around and have them pulling air through the radiator. So I don't know if I have an example of that. Yeah, see these ones are configured in push as well right here. So they're pushing air that way. Or do I want to have my fans configured in push pull. So that's where you actually have fans pushing on one side and pulling through the other side of the rad in order to get well greater static pressure. So the answer to that is actually not that simple. So there's a few different things to consider. So number one is performance. For performance push or pull sort of if you have two fans on a dual 120 mil grad either on this side or on the other side. Actually it doesn't matter. This has been proven time and time and time and time again. It's been debated until you know you can debate it till the cows come home. It's not going to change the fact that within margin of error it performs pretty much the same. Now when it comes to push pull a lot of people are taking sort of I mean especially it was fashionable back in the day and I bought some myself to grab something cheap like Yate Loon fans and then you know you do a layer of fans a layer of radiator a layer of fans and you can turn the voltages of those fans down in order to make them quieter even though you have more of them and you still get decent performance because the push pull configuration allows more pressure to be built up by the fans. Now think about it this way guys. If I take two fans that okay here these two fans are a great example because of the way they're positioned. If I take these two fans are spinning at the same rpm they are capable of moving the same amount of air. I take this heat sink out of the middle and I put them next to each other they're not going to make the air go any faster like the actual CFM is not going to change. What's going to happen though is if there's resistance in the middle then they are going to get the benefit of helping each other to move air through the resistance they're going to gain more pressure. So people often ask me should I run and push pull I say no. The reason I say that is because there are so many fans on the market that are optimized for pressure such as the SP series from Corsair although those aren't necessarily my favorite Noctua's F series are excellent, Seif gentle typhoons are excellent, Silverstone air penetrators are excellent lots of good pressure optimized fans. So you actually have all this pressure available to you by putting another layer of fans on the other side all you're doing is increasing the noise because remember you can't make the air go any faster in an open environment and if you already have a pressure optimized fan then you're good. I mean if you had a non pressure optimized fan so this older Noctua S series is a great example see that you could spin that at 10,000 rpm it would never generate any pressure because there's so much room for air to leak around the outside this is not a good radiator fan whereas you see these nice broad blades on the SP120 that is an optimized radiator fan so anyway. Long story short is push-pull necessary I would make the argument no get a proper fan run in pull and there's a reason for that now when I was taking this radiator off of my test bench I was reminded why I normally configure radiators in pull. So you can see the dead spot in the middle where the fan hub is and then you can also see where all that dust is built up this system was actually running for about a year on the floor so that's why there is so much disgusting dust buildup on it so why do I always run radiators in pull configuration because once you've got a fan girl on there and a fan on here without actually taking the fan off it is impossible to clean. On the other hand whoops if you run a configuration like what I did with here let me just go over here I'm just gonna have to adjust my exposure a little bit there we go if you run a configuration like what I did with my thermo chill here you can see this radiator was also run for a couple years and hasn't been extensively cleaned because the fans on the other side there there's are my Silverstone air penetrators are pulling air through it so it's very very simple to just go through once in a while and you know blow a can of dust at it or use a vacuum to clean it off whereas if the fans in the way it is pretty much impossible to do it and you end up with something that looks like this and without taking the whole thing apart it's very difficult to clean now this is easy when it's on a test bench like this but what if it was in a case what if I had it configured in push with the fans on the bottom here blowing out how am I going to clean that it's like in the middle of a case whereas if the fans are right up against the edge of the case then all I have to do is get in there and kind of go take the dust out of it and you are good to go so thank you for checking out my little sort of spiel about push pull pressure fans non-pressure fans don't forget to subscribe to line this tech tips from our unboxings reviews and other disgusting videos I mean look at that it's disgusting it's like cat hair I think it's mostly cat hair stupid cats.