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Cooling effectives 120mm or 140mm on Top case

Mr. Jyrki
By Mr. Jyrki
in Cooling
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I have Corsair 900D case and still not made big changes for cooling solution what I have in this case.
 Right now I am wondering this: Should three 140mm fans (on top of case) have more effective case cooling than four 120mm fans as exhaust as top of case ?

 

 

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In testing how air flow affects cooling just having airflow is 90% of your temperature change, but in theory whichever moves a larger volume of air would have the most effect

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r5 3600,3450@0.9v (0.875v get) 4.2ghz@1.25v (1.212 get) | custom loop cpu&gpu 1260mm nexxos xt45 | MSI b450i gaming ac | crucial ballistix 2x8 3000c15->3733c15@1.39v(1.376v get) |Zotac 2060 amp | 256GB Samsung 950 pro nvme | 1TB Adata su800 | 4TB HGST drive | Silverstone SX500-LG

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Well... You may end up having negative air pressure. Are you fine with that?

Skyggeis Specs:

 

CPU: Intel Core i7-6700K 4.0GHz Quad-Core Processor

CPU Cooler: CRYORIG H5 Ultimate 76.0 CFM CPU Cooler  
Motherboard: MSI Z170A SLI PLUS ATX LGA1151 Motherboard
Memory: Corsair Vengeance LPX 16GB (2 x 8GB) DDR4-3000
Storage: Samsung 850 EVO 250GB 2.5" Solid State Drive 
Storage: Western Digital Caviar Blue 1TB 3.5" Hard Drive 
Video Card: Zotac GeForce GTX 1070 8GB AMP! Extreme
Case: Phanteks ECLIPSE P400S ATX Mid Tower Case Satin Black
PSU: Corsair RMx 750W 80+ Gold Certified Fully-Modular PSU
WiFi Card: Gigabyte GC-WB867D-I REV 4.2
Case Fan: Aerocool DS 140mm Black 93.4 CFM
Case Fan: Aerocool DS 140mm Black 93.4 CFM
Case Fan: Aerocool DS 140mm Black 93.4 CFM
Other: Coolermaster VGA Holder
Other: Phanteks LED Strip 1M
Other: Phanteks Fan Splitter

Monitor: Dell S2716DG

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depending on fans the 140's would, all being the same besides fan size, not to mention you can run them at lower rpm 

the rough formula would be 4*pi*r^2, the r being the fan size and because its ^2 is grows pretty fast. if you are already moving the total voulme of air in s reasonable time then it will have no effect of cooling. if you are really putting that many fans in your case it will not have any noticeable effect. i've had 3 fans and up to 7 fans with little difference between them.

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It would depend on the fans. Fans don't scale linearly between 120mm and 140mm fan designs.

You can usually get more airflow at the cost of higher noise with 120mm's.

If you ever need help with a build, read the following before posting: http://linustechtips.com/main/topic/3061-build-plan-thread-recommendations-please-read-before-posting/
Also, make sure to quote a post or tag a member when replying or else they won't get a notification that you replied to them.

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