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Help with airflow

post #1 of 18
Thread Starter 
I’ve read a bunch of the stickies and tried to figure this out on my own but I’m really not sure what’s best in my situation. Maybe I'm overthinking this.

My fans are:
One 140mm intake bottom front
Two 140mm exhaust top (don’t know the specs on these fans, I’m at work )
Corsair H70 with push/pull exhaust out the back
PSU intake from bottom, exhaust out back

It just seems to me this is running VERY negative pressure with only 1 intake for essentially 3-5 exhaust fans (depending if the PSU fan counts or not, and if the two push/pull fans on the H70 count). I feel like it’s not getting enough fresh air. I’ve thought about (don’t kill me ) flipping one of my top fans to intake so I can at least get some air into the system and over my motherboard; this doesn’t seem very helpful for good airflow, though.

Any recommendations on a setup or am I better off leaving it the way it is?
post #2 of 18
Quote:
Originally Posted by frenetic1amnesic View Post
I’ve read a bunch of the stickies and tried to figure this out on my own but I’m really not sure what’s best in my situation. Maybe I'm overthinking this.

My fans are:
One 140mm intake bottom front
Two 140mm exhaust top (don’t know the specs on these fans, I’m at work )
Corsair H70 with push/pull exhaust out the back
PSU intake from bottom, exhaust out back

It just seems to me this is running VERY negative pressure with only 1 intake for essentially 3-5 exhaust fans (depending if the PSU fan counts or not, and if the two push/pull fans on the H70 count). I feel like it’s not getting enough fresh air. I’ve thought about (don’t kill me ) flipping one of my top fans to intake so I can at least get some air into the system and over my motherboard; this doesn’t seem very helpful for good airflow, though.

Any recommendations on a setup or am I better off leaving it the way it is?
Im assuming that the fans in the case are the ones that came with it, which means that those fans opperate at around 1000 RPM (I looked it up).

really i would say try it if your temps are bad, for example on my case i have a side fan that is exhaust, which contradicts everything i have been taught, and oddly enough i get much better temps with it that way.

Moral of the Story: Just try it, it could turn out better or worse.
post #3 of 18
You only have as much air leaving the case, as being put in by the one fan. I suggest making the two top fans intakes, front one intake, h70 outfan, and PSU outfan.

People will argue becuase heat rises, but its the best thing you can do in your situation, so you still have airflow and not just pockets of circulating air.

The H70 fans i would assume move a lot of air, and I know PSU fans move tons of air.
Edited by TechRex - 3/7/11 at 2:02pm
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Northern Warrior
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post #4 of 18
heat isnt gonna rise if oyu push it down.... common mistake Air will go where you push it
post #5 of 18
Thread Starter 
Quote:
Originally Posted by TechRex View Post
The H70 fans i would assume move a lot of air, and I know PSU fans move tons of air.
The H70 moves the most air of all my fans so that does a good job of getting heat out. My PSU fan rarely turns on though, and when it does it only looks like a couple hundred RPM. Might be negligible actually.

I'm going to try it with both top fans as intake. Seems like it'll work pretty well actually. Bringing fresh air directly through my H70 rad with the rear fan and giving some more air over the rest of the motherboard with the front fan. It'll be hard to tell a difference though. My computer is right next to the window and the cold weather today is pushing my temps way down regardless. Normally I idle at 35, today I'm 35 at load. I'll see how it goes in the next few days.

Quote:
Originally Posted by Onions View Post
heat isnt gonna rise if oyu push it down.... common mistake Air will go where you push it
Good point, if I picked that up right. Seems like having more air will help in this situation regardless of where it's going.
post #6 of 18
if your H70 is one of the top fans, I recommend making it an exhaust out the back. You need to keep other components cool too, as well as the CPU.
If thats the case with your PSU, It'll probably blow soon. It may take some of your components with it also.... I suggest either upgrading or switching out the fan :
unscrew the cover
open it
unscrew the fan
unplug it
plug another fan in (connect corresponding wire colors)
cloe it back up.
Edited by TechRex - 3/7/11 at 4:30pm
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Northern Warrior
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post #7 of 18
Thread Starter 
Bah, I wasn't very clear. My H70 is mounted at the rear; I was implying the rear of my two top fans will bring cool air to the H70.

The PSU fan most likely isn't bad, it's just about two weeks old. The SeaSonics are really efficient and known for rarely needing to use the fan. It doesn't look like its stressed out, going on a duty cycle, on for ~5 seconds and off for ~30 seconds. It takes a while for the fan to spin down so it doesn't look gummed up or anything. The whole unit barely gets warm to the touch as well.

I moved my computer away from the window a bit so it shouldn't be so affected by that. At load my CPU is running around 8C cooler, so that's a big jump with change in direction. My 5870 doesn't seem very affected, though.
post #8 of 18
Well there you go ^_^. to a lot of people thats a very good drop in temp. Once I get some new RAM, I'll be joining you at 4ghz.
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Northern Warrior
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post #9 of 18
Thread Starter 
Yeah I'm definitely happy with the temps now.

I had a fun time overclocking my 1100T. I can easily go higher than 4GHz but I have to go way up in voltage. I'm sure it can run fine but I'm not comfortable giving it 1.46v+. I went back and forth for days playing with my voltage but got frustrated and just decided to stay at a "mild" 4GHz . Also, I had my window open giving my system some nice freezing New England air and I didn't account for how much my temps would go up when I actually run it at normal room temps. Good luck with yours!
post #10 of 18
Quote:
Originally Posted by Onions View Post
heat isnt gonna rise if oyu push it down.... common mistake Air will go where you push it

Quote:
Good point, if I picked that up right. Seems like having more air will help in this situation regardless of where it's going.
Unless your pushing into something solid =) like the bottom of the case, or better yet a GPU, then guess what it rises right back up... oh then it goes down again and gets sucked up again =D.

It would kinda be like running a secondary loop in a watercooling set up that has a loop that skips the Radiator and can continue to get hotter .

Better off following the laws of physics if possible.

Depending if you need direct airflow over a piece, a high negative pressure case gets plenty of decent airflow as long as the exhaust fans are placed so they can suck in a way to pass the fresh air over the components.

Only intake suggestions I have are put in a side mounted fan even if you have to drill it in, to get direct airflow on the motherboard.
Edited by Neokolzia - 3/7/11 at 9:37pm
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1TB WD Blue 240gb Kingston SSDnow V300 x2 420mm Custom EK Loop Windows 10 64bit Home 
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