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Intake vs Outtake fans
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Old 8th June 2004, 23:01   #1
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I don't know where exaclty i can post this one!

Is their any disadvantages of having more intake fans than outake fans?
 
Old 8th June 2004, 23:03   #2
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some people belief that low pressure yield better temps, so more outtake then intake fans
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Old 8th June 2004, 23:12   #3
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Well this is my fan layout :

on the back i have two intake fans (since i have a Cooler master blower to help it get air from outside the case) at the side at the bottom (near the Gcard) i have 2 outlet fans - not sure if i should make these intake too. at the top of the case i have on outake, and another intake in front. (i also have a double fan PSU).

(all fans are 80mm)

Do you think i sould change the layout of the back and side fans? (I think if i make the back fans as outlet fans my cooler master blower would not be helped geting air from outside ( it faces the back therefore gets air from there - but i can turn it around as i wish)) and if i make the side one as intake they would blow air on the Gcard heatsink (adv i think)

Therfore Currently: 3 intake and 3 outake + PSU



Thanks.

Ncc
 
Old 8th June 2004, 23:21   #4
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"on the back i have two intake fans "

on the back of the PC it will suck hot air into the case, switch them around!

the coolermaster blower (you are talking about the big hamster wheelie fan right?) is aimed at pulling air over the HD's and towards the back of the case

top outtake is good.

front intake is good.



write down your case & CPU temps under full load (use prime95 or cpuburn www.google.com it) for 30min.

shut down system, flip the 2 fans at the back, and the CM blower

repeat the test !
report back
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Old 8th June 2004, 23:45   #5
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Static pressure (increases) being in push and pull condition yield better air flow; i.e. intake blowing in and exhaust sucking out.

When a fan is given a 30 CFM spec, means it is rated in mid air where air pressure is equal on both ends. When a fan is placed on/near an object, the 30CFM will reduce and sound leve increases due to out of balance pressure.

A good balance is the better solution. However, you must take into account the restrictive air passage from the intake fan which must pass over / around HDD's; smaller vent holes in front panel, etc.

Negative pressure also attracts more dust around cracks, i.e. floppy drive; CD drives etc. as air will find it's way in, like water flows downward.
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Old 9th June 2004, 11:38   #6
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Quote:
Originally posted by jmke
"on the back i have two intake fans "

on the back of the PC it will suck hot air into the case, switch them around!

the coolermaster blower (you are talking about the big hamster wheelie fan right?) is aimed at pulling air over the HD's and towards the back of the case

top outtake is good.

front intake is good.



write down your case & CPU temps under full load (use prime95 or cpuburn www.google.com it) for 30min.

shut down system, flip the 2 fans at the back, and the CM blower

repeat the test !
report back

Yep its the Aero 4 that wheelie

Thanks jmke , I will do the test...meanwhile - do you think I should also flip the side fans? I have two outake at the moment... should i make them an intake on the Gcard? thanks a lot for the help
 
Old 9th June 2004, 11:39   #7
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yes always make side-fans intake, unless you use a CPU cooler which sucks air away from the heatsink (like the Scythe Samurai or Alpha PAL series)
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Old 9th June 2004, 11:43   #8
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oki thanks - that balances intake and outake fans again

I am currently running the test - i will post the results after about an hour

thanks

Ncc
 
Old 9th June 2004, 14:01   #9
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Quote:
Originally posted by jmke
"on the back i have two intake fans "

on the back of the PC it will suck hot air into the case, switch them around!

the coolermaster blower (you are talking about the big hamster wheelie fan right?) is aimed at pulling air over the HD's and towards the back of the case

top outtake is good.

front intake is good.



write down your case & CPU temps under full load (use prime95 or cpuburn www.google.com it) for 30min.

shut down system, flip the 2 fans at the back, and the CM blower

repeat the test !
report back

Here are my results... (After 30mins of CPUBurn-in)

PC Specs:

CPU: P4 2.6Ghz 800FSB, HT
MOBO: Abit IC7
GCard: GeforceFX 5600 256Mb
RAM: 512Mb
CPU Cooler: Coolermaster Aero 4-Lite

Old Fan Layout:
CPU temp: 57.5
Rear Case Fan: 32
PWM temp: 45

New layout (flipped rear and side fans)

CPU temp: 56
Rear Case Fan: 31
PWM: 42.5

Note: My room temperature is not very cool since I left My A/C off and it's already summer here.

Ncc
 
Old 9th June 2004, 14:27   #10
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PWM drop is nice, if you put a radial fan on the Aero4 you will see bigger difference in temp drops

the Blower is noisier and pushes less air = higher temps
http://www.madshrimps.be/?action=get...211&articID=68
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