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Rear Fan as intake

post #1 of 11
Thread Starter 
Is there any data any where from testing on this?

I had pretty good results making some changes to my case, was wondering how this would look for someone else. They are getting a Haf X 942, with an H80 cooler. He is replacing all of the fans with 110cfm blue led 200 mm fans and getting 2x 120mm 69cfm fans for the H80.

So his setup will be:

2x 200mm 110 cfm fan top exhaust
1x 200mm 110 cfm fan front intake
1x 200mm 110 cfm fan side intake

I think that since there is no cpu fans/cooler that the H80 would benefit from have the 2x 120mm fans in push/pull but as an intake on the rear of the case, this should let the pressure stay positive. Others are saying as exhaust, thus producing negative pressure.

From my own experience with my 690, I saw an average of 7 degrees lower across the board adding a filter and switching my rear exhaust to an intake. However I did several other things as well to improve air flow, decrease sound and eliminate some of the dust, and our cases are very different.

I think it would produce similar results, but better being that there's no internal fan on the cpu to disrupt the air flow, and it's such a large case that the cool air being pulled in over the radiator could help temps as well...


Here's a pic to give a sort of visual...what are your guys thoughts, and is there any testing anywhere that someone has done with similar orientation?




hafxair.png
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post #2 of 11
Some say that the hot air exhausted from the GPU just goes up then gets sucked back in the case from the rear intake....well from what i read around hear anyways.
EDIT: but if you experienced good results before then go for it!
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post #3 of 11
Thread Starter 
Quote:
Originally Posted by Yokes29;15320838 
Some say that the hot air exhausted from the GPU just goes up then gets sucked back in the case from the rear intake....well from what i read around hear anyways.
EDIT: but if you experienced good results before then go for it!


Yes that's what some are saying too, in my CM 690 it hasn't been an issue, over all I got lower temps, was actually able to scale back the GPU fan too, so it's a lot quieter now as well, and haven't had to dust my case as often.

I think in his situation it can only be better as he is in a full tower case and not a mid tower case. He is not running SLI, he is getting a single GTX 580 Lightning card, on a Z68 board, so he could actually move the card to the lower PCI-E lane and still run at x16, and also increase the distance between the GPU exhaust and the rear intake.

Worse case scenario he could get a directional shroud and mount it on the rear facing up to avoid pulling in the hot air of the gpu, but with my own results, I don't think that would be necessary.

I'm trying to tell him it won't hurt to try, but others are saying it's a bad idea and not to waste his time etc...so he's confused. I told him to try them as exhaust for a week, monitor temps and dust, then clean the case, flip the fans to intake, and run for another week monitoring temps and dust again. Not hard to do, and could be worth it.

To me it would be any way, I hate dust, I live in a rural area, with lots of animals, 3 kids, and a dry environment, so dust is massive here lol...
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post #4 of 11
I think that's a good idea! Anyways its not hard to uninstall a fan and flip it around. Tell him DO IT!
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post #5 of 11
Thread Starter 
Quote:
Originally Posted by Yokes29;15321012 
I think that's a good idea! Anyways its not hard to uninstall a fan and flip it around. Tell him DO IT!

agreed...hopefully he tries it out and lets me know the results, it may influence my next purchase lol...

Was hoping there was some more insight out there, 91 views and you're the only one that posted hehe...no one else has tried anything like this?
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post #6 of 11
Well... most people with a Lian Li A05 has this standard but their mobos are flipped upside down. They have very good CPU temperatures though.
    
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post #7 of 11
The important thing to note is you're using an H80. Closed loop rads will tend to do better with intake, and it's even suggested in the install guides. The air inside your case will be hotter than outside, especially if you've got a hot card/cards and an OC'd mobo.

If you're using a tower heatsink, I would suspect that rear intake would not be as good.
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post #8 of 11
Quote:
Originally Posted by memnoch_thedevil;15320758 
Is there any data any where from testing on this?

I had pretty good results making some changes to my case, was wondering how this would look for someone else. They are getting a Haf X 942, with an H80 cooler. He is replacing all of the fans with 110cfm blue led 200 mm fans and getting 2x 120mm 69cfm fans for the H80.

So his setup will be:

2x 200mm 110 cfm fan top exhaust
1x 200mm 110 cfm fan front intake
1x 200mm 110 cfm fan side intake

I think that since there is no cpu fans/cooler that the H80 would benefit from have the 2x 120mm fans in push/pull but as an intake on the rear of the case, this should let the pressure stay positive. Others are saying as exhaust, thus producing negative pressure.

From my own experience with my 690, I saw an average of 7 degrees lower across the board adding a filter and switching my rear exhaust to an intake. However I did several other things as well to improve air flow, decrease sound and eliminate some of the dust, and our cases are very different.

I think it would produce similar results, but better being that there's no internal fan on the cpu to disrupt the air flow, and it's such a large case that the cool air being pulled in over the radiator could help temps as well...


Here's a pic to give a sort of visual...what are your guys thoughts, and is there any testing anywhere that someone has done with similar orientation?




hafxair.png



So far this setup you illustrated here is the same setup here.
Before this, I had the side exhausted, rear H70 exhausted and the top are intake.

The ambient temperature around the ram area is very cool, not hot at all but the downside is the GPU gets very hot.

In your setup, your GPU will be cool by 10'C and area around the ram will be hot but as long your top exhaust fans have a high CFM would be okay.

The area around the ram would be about 35-40'C.
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post #9 of 11
Quote:
Originally Posted by Yokes29;15320838 
Some say that the hot air exhausted from the GPU just goes up then gets sucked back in the case from the rear intake...

If your friend has a card that has a design like this IMG_0015-21-600x337.jpg


there will be little air coming out of the rear exhaust, so no problem.
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post #10 of 11
Thread Starter 
Quote:
Originally Posted by listen to remix;15323590 
Well... most people with a Lian Li A05 has this standard but their mobos are flipped upside down. They have very good CPU temperatures though.


This is true...I think it will do well.
Quote:
Originally Posted by a pet rock;15323657 
The important thing to note is you're using an H80. Closed loop rads will tend to do better with intake, and it's even suggested in the install guides. The air inside your case will be hotter than outside, especially if you've got a hot card/cards and an OC'd mobo.

If you're using a tower heatsink, I would suspect that rear intake would not be as good.

That's what I thought too, was hoping to find some link or info to provide him with on this, thanks smile.gif
Quote:
Originally Posted by djriful;15323688 
So far this setup you illustrated here is the same setup here.
Before this, I had the side exhausted, rear H70 exhausted and the top are intake.

The ambient temperature around the ram area is very cool, not hot at all but the downside is the GPU gets very hot.

In your setup, your GPU will be cool by 10'C and area around the ram will be hot but as long your top exhaust fans have a high CFM would be okay.

The area around the ram would be about 35-40'C.

Thanks for the reply, I thought about switching the top to intake too, but seems like too much fighting with the natural flow of air, heat rising and all.

Quote:
Originally Posted by SpammisT;15323749 
If your friend has a card that has a design like this IMG_0015-21-600x337.jpg


there will be little air coming out of the rear exhaust, so no problem.


Ya exactly my thoughts, it's a GTX 580 Lightning, so most of the air will be dumped back in the case any way...Thanks smile.gif
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