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Case fan setup

post #1 of 6
Thread Starter 
Ok, so I need some advanced minds thinking on this cause I'm not sure which way to set up my case fans and my new H50.

Imagine a square, if you will, to represent my case.
I have a 120MM intake fan at the front of the case, bottom right hand corner of the square.

I have spots to mount a 120mm fan on the back of the case, in the upper left hand corner of the square, and a spot to mount either a 120mm or what I'm guessing is 140mm in the top of the case ALSO in the upper left hand corner directly above the rear fan.

So what I'm wondering is, if I do a push/pull setup on the H50 radiator out the back of the case, should I use the top mount as exhaust or intake? I was thinking intake since that would be 2 120mm fans blowing in (top and front), and technically 2 120mm fans blowing out in the push/pull.

Am I correct in this thinking?

Extra credit: Should I pick up a 140mm for the top mount?
post #2 of 6
Not quite the push/pull does not equal the flow of two fans side by side as the fans are still spinning at the same speed and they have the same blade efficiency the push/pull tries to compensate for the flow loss due to radiator drag and decreased flow area. So really the push/pull fans move about as much air as one unloaded fan. Also you want the top fan as exhaust because it makes more sense from a fluid flow perspective if the air in the case is heated it will want to rise so fighting it with a downward blowing fan just means that it will intake very little fresh air from the top and the hot air in the case can only escape by going through the radiator making it hotter. so just put a more powerfull fan on the front intake.
Sandy Thunder
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QuickSilver X1
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CPUMotherboardGraphicsRAM
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Crucial M4 64GB 'Cuda 320GB XSPC Rasa 750 RX240 push/pull + Alphacool UT60 ... Win 7 Pro x64 
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Sandy Thunder
(18 items)
 
QuickSilver X1
(15 items)
 
 
CPUMotherboardGraphicsRAM
i7-3930k C1 4.6GHz @1.344v Sabertooth X79 2x EVGA GTX 560 Ti SC SLI 900/2106 Dominator 1866 16GB 9-10-9-27 
Hard DriveHard DriveCoolingOS
Crucial M4 64GB 'Cuda 320GB XSPC Rasa 750 RX240 push/pull + Alphacool UT60 ... Win 7 Pro x64 
MonitorMonitorMonitorKeyboard
Asus VE198D 19" Samsung 920NW 19" Samsung 906BW 19" Logitech G510s 
PowerCaseMouseMouse Pad
Corsair HX850M Carbide 400R Cyborg M.M.O. 7 Corsair MM200 
AudioOther
Bose Music Monitor Nuforce Icon HDP 
CPUMotherboardGraphicsRAM
Phenom II x6 1090T BE Sabertooth 990FX Radeon HD 5770 1GB Corsair Veangence Blue 
Hard DriveOptical DriveCoolingOS
WD Caviar Black 1TB  Lite ON 16x DVD-R/RW ThermalRight Silver Arrow Windows 7 Professional 64 bit 
MonitorKeyboardPowerCase
Syncmaster 921BW 19" & Syncmaster 965 19" and S... Apple aluminum wired keyboard Corsair TX650 Silverstone TJ05 with window and thermal contro... 
MouseMouse PadAudio
logitech mx air None Monsoon MM-700 
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post #3 of 6
Heat rises. Your top fan is an exhaust. Your upper rear fan is an exhaust. A 140mm or 120mm is not so much an issue. The 140mm can spin at a slower speed and more more air so "technically" it is a quiet fan. This is pretty much old school thinking. Fans are so much better now and 120mm is such a standard that there are more choices so read some reviews on various brands.
Edited by Mercyflush64 - 11/17/11 at 1:33pm
post #4 of 6
Thread Starter 
Ok, I've run into another snag. I only have spots on my motherboard for 4 fans. The CPU fan goes to the radiator fan, the pwr_fan runs the pump, the front fan takes up another spot leaving me with one more spot on the board for a fan. So, pull for the push/pull or blowhole exhaust my guru's?
post #5 of 6
Don't let the motherboard control your rad fans. Either buy a cheap fan controller at the very least or just plug them directly into a 4 pin header from the PSU and let them run full blast all of the time. This is where your choice of fan becomes important. Do you want to run them full all of the time and not worry that a kid or someone might mess with your fan controller. You CAN always take a fan controller and mount it in a bay back a little so you can also snap on a bay cover to your case to hide it. This way you can buy slightly stronger fans and turn them down a bit. Usually low to medium fans are used in this configuration. You don't need to move air too fast through a rad or it is not an efficient transfer of heat.
Edited by Mercyflush64 - 11/17/11 at 2:06pm
post #6 of 6
Thread Starter 
I'm only following the directions and working with what I have on hand.

Currently I'm using the Corsair fan that came with the H50, two red LED Antec 3 speed 120mm's and the two case fans that came with the case.

I can appreciate wanting a full on hardware controller for fans but for right now I don't have one, so I think I'm gonna go with the last fan mounted in the push/pull, because I don't want to be out a computer just to worry about fan control.
Hell I'm still trying to figure out how to get the front panel off to access the front case fan.
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