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Best case cooling, where to place fans??

post #1 of 11
Thread Starter 
Hi I have a HEC 66RC, same as rosewill destroyer.

It has:
1x 120mm rear
2x 120mm top
2x 140mm front
optional 1x 120mm side
optional 1x 120mm bottom

My temperatures are fine, but want to know the best fan configuration so my temperatures are as low as possible.

Heres my current setup:
1 rear
2 top
2 front

Should I use the side fan, bottom fan or both. Also should I have my heatsink as passive, push, pull or push and pull?

I don't want fans all over the place but want to know what configuration is the best.

My case is raised and on wood.

I know positive air pressure is the best, but not sure if a side would interfere with the airflow, but not sure whether a bottom fan will provide enough air.

I don't know if a push and pull is necessary on the heatsink or if it would help move the airflow in a specific direction, too many options!

Thanks for any replies smile.gif
post #2 of 11
Using the two front fans as intakes and the top and rear fans as exhausts is normally an effective setup. It ensures plenty of space around the intakes to bring in cool air and provides a consistent flow through the case.

Adding a side intake fan over the CPU or GPU can aid in cooling those specific components and increase the cool air going into the case without disrupting the flow of air inside the case.

A bottom case fan can can help with GPU cooling if the case is a traditional ATX with top mounted PSU.

Positive pressure helps control dust in the case, especially if the fans have filters. A negative pressure case pulls air through every crack and crevice, building up dust all over the place.

I hope this helps!
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post #3 of 11
What about attempting to seal every spot inside the case where your intake air can leak out before getting to its intended spot?

Im looking at my stripped down HAF-912 case and wondering if I could gain any improvements by sealing up the oval holes meant for case wires, all of the holes on the motherboard side of the case, etc.
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post #4 of 11
Thread Starter 
Thank you for the reply very helpful! So my setup is pretty decent for cooling. I think I will add a side fan (only space available is lower side because my heatsink blocks top).

My PSU is bottom mounted, with fan facing down.

That means I will have 3 intake and 3 exhaust so it'll be balanced?

Would adding a fan(s) to the heatsink as push or pull do anything for airflow, improve or make it worse? Or would the top fans bring it air through the fins either way?
post #5 of 11
Thread Starter 
And with my case I could seal a tiny opening where the side panels attach. The front of my case is just one big gap for 5" devices, but I have a 3.5" cage which came with it at the bottom.

From the top of the case till the bottom there's a gap for tucking cables, which is on the left side of the 5" bay.

I have side panel which allows two 120mm fans, but I assume my rear and top fans will suck air in through.

My case seems pretty sealed from the looks of it, quite a compact case to be honest compared to my last.
post #6 of 11
mikeo01:
The number of fans blowing in and out is only one factor effecting airflow. It's best to find out how much air each fan pushes measured as Cubic Feet per Minute, or CFM. The manufacturer's website, review sites, or some retail sites like Newegg have that information.

What heatsink do you have?

chrisexv6:
I've never tried sealing all the holes in my case. I would be interested to know the results if you decide to test it.
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post #7 of 11
Thread Starter 
All my fans are exactly same, make sure that I bougt them in bulk. All rated at 61 CFM. The two 140mm intake 63 CFM, all Xigmatek XLF fans.

My heatsink is the Xigmatek thors hammer smile.gif
post #8 of 11
Quote:
Originally Posted by The Ricker View Post

mikeo01:
The number of fans blowing in and out is only one factor effecting airflow. It's best to find out how much air each fan pushes measured as Cubic Feet per Minute, or CFM. The manufacturer's website, review sites, or some retail sites like Newegg have that information.
What heatsink do you have?
chrisexv6:
I've never tried sealing all the holes in my case. I would be interested to know the results if you decide to test it.

I at least agree with the theory. If you had a perfectly sealed case the air couldnt get out at all. Instead, seal the case as best you can except for areas near (above and/or below) where you want the air to exit. These areas would be where heat-generating components are. The effect should be good air flow right where you want/need it as the air can only find its way out in those spots.

Looking at my HAF, the front 1/3 of the motherboard side of the case is completely open. There are other various cutouts Im assuming meant for cable management. And at least one opening in the rear of the case that isnt normally filled. Im going to basically duct tape up those openings. Since I have no benchmark to go against (Im going to put the system together this way) I wont know if truly helps, makes things worse, or doesnt change anything at all.

Or, I can just go positive pressure and let the air flow out as freely as possible by leaving the openings open. I worry that sealing the case will cause noise from the air exiting a small intended opening at a higher velocity than it would if the case were not sealed at all...going positive pressure would kind of bypass that worry, but might require more CFM.
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post #9 of 11
Quote:
Originally Posted by The Ricker View Post

mikeo01:
The number of fans blowing in and out is only one factor effecting airflow. It's best to find out how much air each fan pushes measured as Cubic Feet per Minute, or CFM. The manufacturer's website, review sites, or some retail sites like Newegg have that information.
What heatsink do you have?
chrisexv6:
I've never tried sealing all the holes in my case. I would be interested to know the results if you decide to test it.

not quite, the CFM rating from the manufacture is rated at open air. if you have something like a grill or air filter, it can cut down the CFM rating of the intake fan down as much as 50%. it's typically better to go all intake and just strategically leave leakage holes open in the case where you want the air to exit (where the heat is produced the most) this way the cooling air has no choice but to exit where the hot components are and carry the heat out of the case with it.
post #10 of 11
Thread Starter 
Along the lines of case cooling, anyone tried the Arctic F12 PWM fans? I used to have them before but bit confused, all sites say the maximum rating is 54CFM, but on the AC site its 74CFM? confusedsmiley.png

Does anyone know of a really cheap PWM fan? The reason is because for some reason my 4-pin CPU Header can't control a 3-pin fan, whilst my CHASSIS 4-pin header can do it just fine.

I have two front fans attached to my first header, and two fans attached to the second, so it leaves me to take other fans running 100% which I don't want for noise and its life.

So does anyone know of a cheap but OK PWM fan? Or are these F12s the best I could get.
Edited by mikeo01 - 9/15/12 at 2:57am
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