Exhaust Fan Recommendation?

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WIEZZY

WIEZZY

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Jul 27, 2014
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Hi,

I am vamping up my case cooling and came up with this so far:
https://www.flickr.com/photos/wiezzy/15510817008/in/photostream/lightbox/

Can anyone recommend a better exhaust fan in back? My understanding is that the one I wrote down in the picture is more made for pushing air through a radiator, like it is used on top of the case.

I haven't bought any of the parts in green or red yet, so feel free to give me your opinions on those as well. Exception: The 200mm intake fan is on there and can't be reversed.

Plan: The two 140mm fans at the top are meant to push cool air over the CPU radiator, as suggested by Corsair for max cooling. The exhaust in back then takes that hot air and sucks it out. The intake in front pushes cool air over the HDDs and to the GPU, which has the exhaust in back. This setup will create positive pressure in the case, but I believe that any positive/negative pressure will be minimal due to the passive open grate and PCI openings in the back of the case.

Thanks!
 
Solution
TheMagicalWallaby


Corsair is just popular and there is a chance they will replace damaged parts if the cooler leaks (but thta is rare that they leak). The x41 is not better than the H110, its just an idea for you.

The reason why the h100i is popular in particular, is due to people being...
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Oh well first of all i misread you want 140 not 120, I gave you the 120 version:


Warranty
Two years
Fan Size
140mm x 25mm
Fan Type
Quiet Edition
Flow Type
Airflow
Operating Voltage
7V – 12V
Airflow
67.8 CFM
Static Pressure
.84 mmH20
Sound Level
24 dBA
Speed
1150 RPM
Power Draw
.1A

This is the quiet edition. You can get more flow if you go with the non quiet edition that will raise the RPMs (if you don't care about noise) These AF fans are optimized for maximum air flow in an open space, that is how their fins are designed.. What specs are you looking for?
 
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No, you were correct the first time. The fans on top are 140, but the exhaust fan in back (the one I'm asking about) is 120.

The performance version of the AF 120 puts out about 64 CFM, whereas the Noctua puts out about 105 or so, which is something like a 40% difference. I was wondering if the "open space" design of the Corsair made up for the 40% loss of CFM.
 
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The noctura fans will spin at a higher RPM for one, tho they come with a voltage regulator that will lower it to the Corsair speed. I thought you wanted the black, which is why i didn't suggest Noctura they are only brown / white. This ia all about fan speed, not design. That being said, noctura has the best quality overall.e
 
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Ya, I would like all my fans to be black, which is why I went with the 3000 RPM industrial Noctua fans:
http://www.amazon.com/Bearing-Cooling-NF-A14-iPPC-3000-PWM/dp/B00KFCRF1A/ref=sr_1_1?ie=UTF8&qid=1414971676&sr=8-1&keywords=Noctua+NF-A14+iPPC-3000+PWM

So here's what I'm not understanding: Why does the RPM matter? It seems like the only 2 factors in fan choice (besides color) are CFM and noise levels. The Noctua fans put out 40% more CFM, and are accordingly 40% louder (at max speed), but if the fan controller brings them down, the noise level is the same while at the same time having the option to go higher.

I'm really trying to understand these concepts and I appreciate your help. Maybe if you restate in another way? If the hard numbers say that the Noctua moves more air per minute, why does it matter if the fans are "pressure" or "open space" or whatever? More air is more air any way you look at it. The one thing that might make that not true is if Noctua measures CFM differently than Corsair does, but I don't see why they would. Am I making any sense?
 
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I have 3 - 140mm industrial fans in my Enthoo Pro , they are a bit louder even at lower RPM's , but they move a ton of air.

I have 2 on top for exhaust , and you can see my rear exhaust in this pic.

2zgygev.jpg
 
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Well first they are 140 rather than 120. And they are industrial which means he paid a bit more :) Simply put the more air you want to push out quickly the faster most fans have to spin and thus the more noise that they will produce. Higher RPMs = Higher noise.

I like keeping a positive air pressure in my case and in the end by doing a push pull with my radiator(which uses four fans) I can run all four at a lower speed, thus lower sound cause there are four of them. Traditionally 140mm fans are going to be able to push more air than a 120 anyway.

In the end the faster the fans spin (RPM) the more air they can move. The faster they spin the more noise they produce. Think of a bi-plane single propeller vs a jet engine, which engine turns the props faster? Which makes more noise? Which pulls in and moves air faster, thus making the plane go faster. :)
 
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Do not use the top for intake. Use the front, bottom, and sides for intakes. The rear and top should be exhausts. Having the radiator take in air results in hot air being blown into your system, and can heat your GPU and other internals (though not that much, as the only things I would be a little concerned with are the VRM's). You will get fine temps with the rad an an exhaust. As long as air is moving through the rad, you are good to go.

Also, the only thing premium fans will aid in is lowering noise (unless you are getting radiator fans). Premium fans do not offer a cooling benefit over regular fans in most situations. As long as air is going in and out, you are good to go. The number of fans in-taking and exhausting is what matters (and the total amount of fans). If you need two 140mm fans for the rad, Noctua NF-A14's are the way to go. Corsair's AF140 fans only work well on low fpi radiators, and AIO coolers have a high fpi count. the AF140's have a low static pressure, where as the Noctua's have a higher static pressure.
 
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I disagree with a bit here. First off the notion of hot air rises there for top should be exhaust is not completely accurate. The most important part about cooling a computer is airflow. If you have a positive pressure system even with top and front intake, the back can be just fine as exhaust so long as the airflow is sufficient to move that hot air out before it affects the components. This usually means slower fans ontop and faster in the back. Alternatively fans from back and front drawing air in can easily be dissapated out the top with, once again the proper air flow.
 
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I said the word "can" as it is not guaranteed to happen, but is possible (from past users experiences and other experimenting on this website) What is can heat up is the VMR's on the motherboard. It is just an unnecessary thing to do. It shoots hot air into the case, instead of keeping the flow of air moving in and out.
 
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In terms of positive and negative air pressure, having more air available for the radiator will aid in CPU temps. With your temps, I would go for a more balanced air pressure as your components would work a bit better with it. Also, in terms of dust, having a much more positive air pressure in your case helps. Air will be forced out through the open vents. your case will have a harder time keeping positive pressure, so a slightly negative pressure is fine. Just make sure to occasionally dust off your PC's internals.

Get an NZXT X41 if you wat to try and have a positive pressure in the case. The x41 is equal to a 240mm radiator in terms of performance.
 
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Wait, back up... The X41 is a 120mm system that I've never heard of, even after extensive research. You're saying it does as well as the H110 in terms of performance? So why would anyone ever get a big Corsair cooler if a small one like the X41 out-performs it?
 
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No, I said its a 140mm unit that is as powerful as a dual 120mm unit. I was saying that If you want to have an easier job with positive pressure, that cooler will get the job done. Also, if you are going for a dual 140mm radiator, the NZXT Kraken X61 is a better choice.

In reality, any of these high end coolers can handle overclocking. You are overclocking right?
 
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Yes, I plan to OC. I looked into it tho, and you were right - the X41 was cooler than the H100i. So do you have any idea why people seem to favor the Corsair products over the X41 even tho the X41 is cooler and smaller? The X41 would fit my case infinitely better, so if it has better performance, that would be great to know.

Keep in mind that if I get a 120mm cooler like the H80i or X41, I will use Noctua 2000 or 3000 RPM fans in a push/pull configuration.
 
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Corsair is just popular and there is a chance they will replace damaged parts if the cooler leaks (but thta is rare that they leak). The x41 is not better than the H110, its just an idea for you.

The reason why the h100i is popular in particular, is due to people being misenformed about other coolers. People want to stick with whatever is popular so they can guarentee that they have a good product,

Also, don't bother with the Noctua Industrial fans, the regular ones are fine and push pull is not necessary.

My other thing I needed to say is that you'll need to replace that PSU before you overclock. Raidmax PSU's are very bad.

Also the H80i is very different from the X41. the H100i is a single 120mm radiator. The X41 is a 140mm radiator.
 
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Solution
Why do you say push/pull is not necessary? Tests I saw indicated a 10 degree temp decrease in push/pull configuration vs with just one fan. That was on the H80i.

Also, when you say don't bother with the Noctua Industrical fans, do you mean the "regular" Noctua fans are fine, or the "regular" stock fans that come with it are fine?
 
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The regular noctua fans only go up to about 1300RPM. the Industrial fans go up very high in RPM and are loud an unnecessary.

Also we are not including the H80i.

Anyways, what source are you looking at that from? 10 degrees sounds inaccurate if they were using the h80i SP120 fans 9the grey ones they come with). If you want to know why push pull is not ncessary unless you have a very thick rad, watch this. http://www.youtube.com/watch?v=UyC3lZ5WFMk
 
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The video regarding push/pull results is actually a "sequel" to the video you linked to: https://www.youtube.com/watch?v=u8HsjgtMzEg

The radiator was an H80i and the fans were Noctua. He got 94 deg in push and 84 in push/pull.

That said, I think I'm going to stick with the H110, so its a moot point for this particular situation. I didn't know that about the dust buildup tho, so that was good info. Thanks for sharing that video.
 
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That is a 120mm radiator that is slightly thicker than others. If you wanted push pull on the x41 140mm cooler, that would be logical because it is similar to the h80i in terms of it having a thickness boost. Push pull on dual 120 or 140mm aio rads is where it becomes illogical. Another cpu cooler you may like is the swiftech h240x. It's a dual 140mm rad with better parts and fans than the h110, and can be expanded to add more rads or a GPU.
 
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