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Case fans.

djshadow

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#1
Hello guys,

I'm just wondering what is better ? More fans intake or outtake ?
Atm i have one 120 intake . 90 outtake and 140 outtake from psu . (CPU 110mm moves air to the back 90mm fan too)
I am thinking to do 2x 120 intake more . So thats where the questions comes from.
So more intake or more outtake fans are better ?
 

werez

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#2
If you have a good ventilated case , good wire management , you can be ok just with one intake / one exhaust . Imo. 2x2 decent 120mm fans are more than enough and get the job done . If your videocard(s) spread the hot air inside the case , you are better with more fans , but the thing important is the fan`s placement .
 

djshadow

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#3
If you have a good ventilated case , good wire management , you can be ok just with one intake / one exhaust . Imo. 2x2 are more than enough and get the job done .
But you see, there is psu. Hes outtaking air too. I think i would use one more 120mm.
 
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#4
But you see, there is psu. Hes outtaking air too. I think i would use one more 120mm.
lol

On a serious note, if your Graphics Card is HOT, have more taking out. Otherwise, equal it.
 

livehard

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#5
Your best bet is to keep your ambient temperature low (about 65 F or less) and have a little more intake than out. Why? More intake than exhaust=higher air pressure which mean more of the cool air that you have in the room is force to contact components.
 
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#6
From experience, not just speculation.... more exhaust than intake. Oh my god there will be dust from the negative pressure!! Oh well, just blow it out every once in a while and you'll be fine. I've tried different configs on many different cases, always with the same results. Also, placement is important. Intake fans should be low on the side, in the front, or on the bottom. Taking off the PCI (PCIe) slot covers on the back of the case will let fresh air in to the graphics cards and cool off them off noticably if you do have more exhaust than intake. Cutting out those honeycomb fan grills and replacing them with the wire finger gaurds will help too. Also cutting out a place (if one doesn't exist) for a top exhaust also shows noticable differences on a hot box. Other people may have other experiences and opinions but for me with my hot machines folding 24/7 for the past few months now, these steps have given me the best temps of any other setup.

What many people don't realize is that with negative pressure, cool air actually enters the case better and doesn't mix with the hot air from other components nearly as much. I can hold up a lighter to any part of my case that has even the slightest chance of air to enter and you can see the flame being drawn to it.
 

livehard

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#7
Good points. An exhaust on the top is a must. I've never done folding, so I can't say anything about a 24/7 100% load machine. Maybe if my rigs had been stressed more I'd get different results. If I think about it, your results make sense, as do mine. With positive air pressure, the air will remain in the case longer, the longer its in there, the hotter it gets. So maybe I'll run prime 5 for 24 hours and see what I find. In short stints (3 hours of prime) though, I've found positive to work better.
 
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#8
Didn't mean to make my argument sound so pointed, each case will differ too in their airflow patterns. Cable management will play a big role in what setup is best as well. Mostly I recommend setting them up and seeing what gives you the best results. When I build a new setup I always keep the front, side, and bottom (if there is one) as intakes. Top (if there) and the rear are exhaust. Since that usually means more intake fans than exhaust I'll put a much stronger fan as the exhaust (either 38mm deep or a high flow or both if it's not in the living room or bedroom). Most front intakes will have some restriction from both the front faceplate and usually hd's located right behind them. I still recommend cutting out the holes and leaving them open except for the back, top, and sides where I put the wire finger gaurds.
 

djshadow

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#9
So i didnt get you guys. The point for me is to get as much more air to go through the case, thats for NB for vga especially and for other chips . My vga is not taking the air out as high end cards. The heat from vga is all inside :s
 
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#10
I think it should be kinda balanced. I have a intake on the front, intake 120 in the empty drive bays, an exhaust on the back and an exhaust on the top (also have a 120 on my NB).
 

livehard

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#11
Didn't mean to make my argument sound so pointed, each case will differ too in their airflow patterns. Cable management will play a big role in what setup is best as well. Mostly I recommend setting them up and seeing what gives you the best results. When I build a new setup I always keep the front, side, and bottom (if there is one) as intakes. Top (if there) and the rear are exhaust. Since that usually means more intake fans than exhaust I'll put a much stronger fan as the exhaust (either 38mm deep or a high flow or both if it's not in the living room or bedroom). Most front intakes will have some restriction from both the front faceplate and usually hd's located right behind them. I still recommend cutting out the holes and leaving them open except for the back, top, and sides where I put the wire finger gaurds.
It didn't sound too pointed, I hear much worse at work every day.:toast: Your argument sounded pretty mild to me.

So i didnt get you guys. The point for me is to get as much more air to go through the case, thats for NB for vga especially and for other chips . My vga is not taking the air out as high end cards. The heat from vga is all inside :s
It sounds like your case call for a little more exhaust. What are the CFM specs on your fans? Tidy up those cables too. I would think about adding the two 120mm intake fans and another 80 mm exhaust.
 

djshadow

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Motherboard Giga-byte GA-M720-US3 (can cook eggs on NB cooler, rly)
Cooling Zalman CNPS9700LED
Memory Kingston 2x1GB KIT 1066Mhz DDR2 @ 1092mhz 2.2V 5-5-5-15
Video Card(s) ASUS HD4670 1Gb GDDR3 855/1000 - I wish I could push Volts on it :(
Storage 500GB WD BLACK 32MB (soon 2x on RAID0 )
Display(s) BENQ G2420HDBL
Case Homemade
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Power Supply Chieftec 650W TURBO series
Software Windows 7 Ultimate 64bit
Benchmark Scores 3DMark06 - 9032Marks Super PI - 24.458s wPrime 32M 17.895s
#12
It didn't sound too pointed, I hear much worse at work every day.:toast: Your argument sounded pretty mild to me.



It sounds like your case call for a little more exhaust. What are the CFM specs on your fans? Tidy up those cables too. I would think about adding the two 120mm intake fans and another 80 mm exhaust.
I got now 120 intake 90 exhaust.
And 140 with psu exhaust.
Believe, psu sucks the air too...

120mm - Max Air Flow : 44.71 CFM
90MM - Zalman, have no idea about it.