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PSU fan up or down (a poll of sorts)

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  • Cases
  • Fan
  • Components
Last response: in Components
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August 14, 2013 5:19:26 PM

I'll get specific because I'm positive that it makes a differences in terms of case size, etc:

PCPartPicker part list / Price breakdown by merchant / Benchmarks


CPU Cooler: Corsair H100i 77.0 CFM Liquid CPU Cooler ($109.99 @ Newegg)
Motherboard: Asus Z87-PRO ATX LGA1150 Motherboard ($172.99 @ SuperBiiz)
Video Card: EVGA GeForce GTX 770 2GB Video Card ($414.98 @ Newegg)
Case: Fractal Design Define R4 w/Window (White) ATX Mid Tower Case ($104.97 @ Outlet PC)
Case Fan: Corsair Air Series AF140 Quiet Edition 67.8 CFM 140mm Fan ($18.99 @ Newegg)
Power Supply: SeaSonic 650W 80 PLUS Gold Certified ATX12V / EPS12V Power Supply ($99.99 @ Amazon)



Also, depending maybe on how I would position the PSU fan, is it better to push or pull air out of the case via the case fan / liquid cooler? It would make sense to me to choose one or the other for all fans in the case but I'm really not sure...

More about : psu fan poll sorts

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August 14, 2013 6:09:30 PM

Mount the PSU with the fan down, over the filtered intake on the bottom of the case (where the PSU mounts). It will suck cool air through the PSU and out the back, thus cooling the PSU. That PSU won't help much with removing warm air from the case as the fan doesn't spin up until the PSU warms up.
Psu fan down,sucking in cool air.
Since the 100 is a large closed loop cooler it will end up on top. Start with it pulling warm air out of the case. Yes, I know, warm air over a radiator that that air is supposed to cool isn't always logical, BUT doing so will help draw more cool air in from the front and side. A side fan should be an intake fan.
Rear fan stays as an exhaust. Front fan stays as an intake.
You might have to experiment with the 100 to see what works for the best temps.
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August 14, 2013 6:33:26 PM

nostall said:
Mount the PSU with the fan down, over the filtered intake on the bottom of the case (where the PSU mounts). It will suck cool air through the PSU and out the back, thus cooling the PSU. That PSU won't help much with removing warm air from the case as the fan doesn't spin up until the PSU warms up.
Psu fan down,sucking in cool air.
Since the 100 is a large closed loop cooler it will end up on top. Start with it pulling warm air out of the case. Yes, I know, warm air over a radiator that that air is supposed to cool isn't always logical, BUT doing so will help draw more cool air in from the front and side. A side fan should be an intake fan.
Rear fan stays as an exhaust. Front fan stays as an intake.
You might have to experiment with the 100 to see what works for the best temps.


Thanks for the input! I was leaning towards the PSU down, like you suggest.

It's very helpful to know about the H100i pulling air out, so fans on the inside of the case in front of the radiator pulling out to the radiator or fans on top of the radiator pulling air out over it? Sorry if noobish question, first time builder here. I guess the other option would expose wires and such on the outside of the case so that doesn't make much sense...

Thanks!
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August 14, 2013 6:45:52 PM

I'm not sure if there is a specific way to mount that system, but I have generally seen them with the fans below the radiator pushing air over the rad. and out of the case. Have seen a couple using 4 fans, one on each side, in a push-pull arrangement;
You'd have to try with just the two fans to see what works for you and what room you have.
I would mount them under the radiator.

EDIT, 2125 hrs. PDT. Thanks for the vote. I will track this thread for some time. Please repost when you get it set up and are happy with the cooling, I would like to know what works best.
You've got a nice rig there, think you are going to enjoy it.
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August 20, 2013 3:20:13 PM

nostall said:
I'm not sure if there is a specific way to mount that system, but I have generally seen them with the fans below the radiator pushing air over the rad. and out of the case. Have seen a couple using 4 fans, one on each side, in a push-pull arrangement;
You'd have to try with just the two fans to see what works for you and what room you have.
I would mount them under the radiator.

EDIT, 2125 hrs. PDT. Thanks for the vote. I will track this thread for some time. Please repost when you get it set up and are happy with the cooling, I would like to know what works best.
You've got a nice rig there, think you are going to enjoy it.


Hi Nostall,

I'm actually installing my stuff as I write this and I had a question regarding the positioning of the fans with the H100i cooler. Did you mean pull air out as in the fans are over the radiator or under the radiator pushing air through it? My case can handle both the radiator and fans inside of it, just wondering what you meant.

I've read some places that pushing air through from the bottom will cause a lot of dust to get caked to the radiator so pulling air through it with the fans on top is a better solution? Does pushing vs pulling really make that much of a difference beyond the dust issue?

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August 20, 2013 3:37:25 PM

Jaace said:
nostall said:
I'm not sure if there is a specific way to mount that system, but I have generally seen them with the fans below the radiator pushing air over the rad. and out of the case. Have seen a couple using 4 fans, one on each side, in a push-pull arrangement;
You'd have to try with just the two fans to see what works for you and what room you have.
I would mount them under the radiator.

EDIT, 2125 hrs. PDT. Thanks for the vote. I will track this thread for some time. Please repost when you get it set up and are happy with the cooling, I would like to know what works best.
You've got a nice rig there, think you are going to enjoy it.


Hi Nostall,

I'm actually installing my stuff as I write this and I had a question regarding the positioning of the fans with the H100i cooler. Did you mean pull air out as in the fans are over the radiator or under the radiator pushing air through it? My case can handle both the radiator and fans inside of it, just wondering what you meant.

I've read some places that pushing air through from the bottom will cause a lot of dust to get caked to the radiator so pulling air through it with the fans on top is a better solution? Does pushing vs pulling really make that much of a difference beyond the dust issue?



Negative, you will still be pulling airover the radiator and out the case. Set it up whatever way is most aesthetically pleasing to you and enables you to better deal with the wiring placement. Even using 4 fans, you should be able to mount everything in the case: 2 fans against the top grill, attache the radiator with the fan/radiator bolts, two fans attached below the radiator attached to the radiator with the appropriate bolts.
Every month or so when you clean out your case and blow off your radiator most all of the dust will be eliminated. Remember, regardless of what fan you are cleaning (case fan, side, radiator/cooling system) do NOT spin the fan blades with the compressed/canned air: bad for the fan and bearings.
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