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Do i need a rear exhaust case fan?

post #1 of 8
Thread Starter 
i was thinking about upgrading the stock fans in my corsair 550D to noctua.

Right now i have a noctua cpu cooler plus fans, and the rear fan sits fairly close to the rear case fan. I disconnected the rear case fan and checked the CPU temps, but there wasnt much change..although that wasnt under load...

I want to have a very quiet pc....so one less fan would be good....

thoughts?


Edited by takman79 - 7/8/13 at 2:36pm
post #2 of 8
Looking at your setup, no you shouldn't need that rear case fan. The airflow from the push/pull should be enough to force the hot air out of the case. I would run some kind of stress test like Prime95 for half an hour and keep an eye on your temps, if they remain in an acceptable range without that rear fan then you are good to go. smile.gif

Edit: A more conventional way to reduce fan noise in your would be to keep the rear exhaust fan and remove the second fan from your CPU cooler.
Edited by jhaze84 - 7/8/13 at 2:46pm
post #3 of 8
Test your temps which and without rear fan running prime95 and let us know what those temps are.
post #4 of 8
if you have a positive pressure setup, then no. if you have a negative pressure case, then sure why not biggrin.gif
post #5 of 8
The key is having good airflow, not airblow. We want the hot CPU & GPU cooler exhaust airflow to exit the case without mixing with the cool intake airflow going to coolers. Sometimes exhaust fans even in a positive pressure case will improve the airflow of hot exhaust air out of case.

That's why I said try both with and without exhaust fan.

I use a cheap indoor/outdoor wired remote or terrarium digital thermometer to monitor air temps inside my case. Twist a piece of insulated stiff wire into the last 8" so you can bend it to set where you want it... like an inch in front of your cooler.. to see what the air temp going into cooler is compared to room temp. 1-5c above room temp is fine.
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post #6 of 8


I use this picture to help me out. I think your ok, but I do advise you use a the rear exhaust fan to help push hot air out.
post #7 of 8
One fan, if it's not the noisiest one will not make much difference in overall noise. It's better to go for quieter fans than to cut down on numbers as more heat will make other ones work harder. Looking at the picture I would turn CPU cooler to blow up, Take that rear one out and put a slow quiet fan on the side of the case to blow at GPU, if possible. It would help cooling down GPU (usually the hottest part ) and some fresh air to the PSU. Closeness of 2 fans can also produce some unexpected turbulence and ad to sound effect, usually manifested by high pitched sound. Ad to that unusual frequencies that unsynchronized rpms (makes low, rumbling noise) of few fans can produce and.... well, you see the problem.
Edited by MishelLngelo - 7/11/13 at 11:56am
post #8 of 8
Cut out the rear fan grill and remove the rear fan as well. You will truly get the best of both worlds: no noise from the turbulence as air hits the highly restrictive rear grill not to mention one less fan in the case, and with no rear grill the CPU fan will be more than powerful enoughwwithout anything in its way, as you are taking the restriction from 48-57 percent down to essentially 0 percent!
   
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Z77 Bench-a-lot
(31 items)
 
CPUMotherboardGraphicsGraphics
i7 3930K @ 4.92Ghz Asus Rampage 4 Extreme EVGA GTX670 FTW 2GB  EVGA GTX780Ti Classified K|ngp|n Edition @ 1483... 
GraphicsRAMHard DriveHard Drive
EVGA GTX780Ti Classified K|ngp|n Edition @ 1483... 16GB G.Skill Ripjaws-Z @ DDR3-2248 9-10-9-26 1T Samsung 830 256GB SSD WD10EZEX 1TB HDD 
Hard DriveHard DriveHard DriveHard Drive
WD10EALX 1TB HDD Seagate Barracuda 7200.14 1TB WD3200AAKS 320GB HDD WD5000HHTZ 10krpm 500GB VelociRaptor 
Optical DriveCoolingCoolingCooling
LG/Hitachi Slim DVD-R/W Custom MB-Backside VRM-sinks (Copper) 3x NZXT RF-FX140LB 1-2krpm 98.3CFM Case Fans 2x Corsair SP120-PE Case Fans 
CoolingCoolingCoolingCooling
Heatkiller GTX680 "Hole Edition" Block + Backplate XSPC Single-Bay Res (Single 5.25 bay) EK Multioption Res X2 - Advanced 150 DD "Fill-Port Res" + Fill-Port Fitting (Red) 
CoolingCoolingCoolingCooling
2x MCP35X + Heatsinks/80x15mm Fan XSPC EX420 Alphacool NeXXos UT60 240 6x Bgears Blasters 140mm 1800rpm Fans 
CoolingCoolingCoolingOS
4x Koolance 120x25mm 2600rpm Fans Comp/Rotary Fittings (BP/XSPC/Monsoon) Primoflex Pro LRT - White (1/2x3/4) Windows 7 Professional 64bit  
MonitorMonitorMonitorMonitor
Dell P2210Hb 21.5" 1920x1080p Viewsonic VA2012WB 20.1" LCD 1680x1050 Dell U3014 Eizo 27" 1440p 10bit RGB-LED Backlit AH-IPS Panel 
MonitorKeyboardPowerCase
55" LG HDTV (their top 2014 model) Ducky Mechanical (Browns) NZXT HALE90 850W + 8 blown-up AX1200/i's NZXT Switch 810 (White) 
MouseMouse PadAudioAudio
R.A.T.3 + MX510 My Desk GRADO RS1i Headphones Grado PS1000 Headphones 
OtherOtherOtherOther
Bitfenix Hydra Pro Fan Controller 5ch 30W/ch Bitfenix Alchemy Individually-Sleeved Extension... NZXT Individually-Sleeved Front Panel Wires (Bl... Phobya Sleeved 1x3pin-to-4x3pin Fan Splitter 
OtherOtherOther
Sleeved Wires w Paracord myself (no Heatshrink) Custom Front and Top Panels w HexxMesh *In Prog... Working on Custom Pedestal Prototype 
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