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Case fan questions - Page 2

post #11 of 13
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the conclusions I just drew were based on the suggestions and advice that you guys provided me, so don't think that I don't appreciate the replies
   
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post #12 of 13
Quote:
Originally Posted by jchap1590 View Post

the conclusions I just drew were based on the suggestions and advice that you guys provided me, so don't think that I don't appreciate the replies

Bottom intake shouldnt make any problems because if the case isnt a cheap POS it will have a dust filter. The reason i said not to put an exhaust fan on the back is so it might not pull out all the good fresh air, but maybe it will pull out the hot air from GPU? 50/50% i dont know. Airflow is a lot of trial and error.

As for heat rising........ Just rule that out completely on case air flow because it doesnt REALLY matter at all.
 
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CPUMotherboardGraphicsRAM
AMD FX 8350 @ 4.8 - 2700NB ASUS Sabertooth 990FX R1.0 SAPPHIRE Radeon HD 7970 1220/1700 G.Skill Ripjaws X @ 2400 10-12-12-28 
Hard DriveHard DriveCoolingOS
Kingston HyperX 120GB SSD 550/510 (Boot) Western Digital Caviar Black 2TB (Stuffs) Phanteks PH-TC14PE Cooled by 1 NF-F12 and 2 NF-... Windows 7 64 bit 
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Benq G2420HD Steelseries 6GV2 Silver power SP-S850M Lian Li T60B Test bench. 
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Razer Deathadder Black (No lights!) Steelseries hardmat Steelseries 5HV2 White 
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post #13 of 13
Quote:
Originally Posted by jchap1590 View Post

Hello,

I recently upgraded my old mid-tower case (CM 690 II Adv.) to a full-tower (CM Storm Trooper)! However, I am at a bit of a loss as to how I should have my fans set up..

I don't really understand the differences/advantages between 'static pressure' and 'high airflow' fans.. which are used for what application(s)?
static pressure = the pressure point the airflow stops. The pressure difference between intake and exhaust.
high airflow = just what it says.
Calling fans 'static pressure' and 'high airflow' is just advertising hype. Reality is anytime a fan moves air there is a pressure differential between the intake and exhaust of fan. Than you add a grill, a filter and another grill you have lowered the pressure of air going into fan even more. And the fan is pushing air at a HDD cage, cables, etc as it move air though the case increases the pressure out of fan. Now if you have a 'static pressure' fan it keeps right on moving air at whatever speed.. but if you have a 'high airflow' fan that has very low static pressure rating than it might not be moving much at all. .
Quote:
Originally Posted by jchap1590 View Post

I can conceive, conceptually, which fans I would want to be intake and which to be exhaust but I don't fully comprehend how negative or positive case pressure can affect performance and/or dust build-up within the case.
Negative pressure in case allows air (and dust) leak into case through every crack and hole air can come in through. Result is dust collects in and around switches, USB sockets, optical drive, etc. Having positive pressure in case means air leaks out all of the above places and no dust collects. We are talking less pressure then when your ears pop rolling down/up the window in car while driving down the highway.
Quote:
Originally Posted by jchap1590 View Post

Currently, I have the following setup:

(1) 120mm intake, front
(1) 120mm cross-vent., side (rotated one of the HDD cages to cross-vent directly through my case, in one side and out the other)
(1) 120mm intake, side panel
(1) 120mm exhaust, side panel
(2) 120mm exhaust, push config. for H100 liquid CPU cooler
(1) 140mm exhaust, rear

I do have (1) optional mounting space left, available for a 120mm fan, in the bottom of the case.. is it really useful to put a fan here??

I mounted my PSU to intake from the top (fan faces inward of case, not outward/down, and obviously exhausts out the rear)
You have way more exhaust then intake. Result is negative case pressure and case can only exhaust as much air as is being drawn into case. You can have 20 exhaust fans but if you only have 2x 120mm intake vents and fans you are only going to get 2x 120mm vent holes of air moving through case. Simple as that.
Quote:
Originally Posted by jchap1590 View Post

I can understand that too much intake and not enough exhaust (positive pressure?) could possibly create a heat build-up within the case.. but, I could also see how too much exhaust and not enough intake (negative pressure?) would dissipate heat efficiently but at the same time literally suck dust into the fan at a presumably faster rate.
Airflow removes heat, not positive or negative pressure.
Quote:
Originally Posted by jchap1590 View Post

I gather the goal is to have an equal a balance as possible of both intake and exhaust (circulating cool air and dissipating heat), all the while minimizing any dust collection.. am I getting that right?

I do have mesh grilles on all my fans, so it could just be that regular cleaning of those is inevitable with a case having as many fans as I do?

Lastly, if I understand correctly: my H100 will be more efficient in a push-pull config (that is, 2 fans pushing air through the radiator and 2 fans drawing air out the other side) , is that correct?
yes
Quote:
Originally Posted by jchap1590 View Post

Basically, my questions (in summation) are:

How many intakes should I have?
How many exhausts should I have?
Which fans should be (high)airflow-oriented?
Which fans should be static(pressure)-oriented?

Thanks, in advance, for any responses! smile.gif
JChap1590
You want a few more cfm total intake than exhaust.
All fans should be of decient static pressure and airflow ratings.
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