How do I add more fans to my gaming PC?

jason1297

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Nov 28, 2015
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I'm building a gaming PC with an ASUS H81m-plus motherboard inside a Corsair spec M2 case.
The MOBO has 1x4 pin chassis fan connector, and the case has 1x3 pin 120mm fan. I understand that the 3 pin fan can go in a 4 pin slot, and I won't be able to control the speed.

The thing is, I want to add 2 more 120mm fans to the chassis. Do I need some kind of splitter, or is my motherboard simply incompatible? If I do need a splitter, will it reduce the speed my fans are running at (one socket supplying power for 3 fans?)
 
Using a splitter will result in the fans running at half speed. You should get a fan hub as those handle power and control independently. You can either find an internal one and put that somewhere, or get a 5.25" bay fan controller (easier).

Keep in mind however that additional case fans provide no tangible benefit unless you're running 3-4 graphics cards.
 
a nice fan controller:
http://www.amazon.com/gp/product/B004OEDYHY?psc=1&redirect=true&ref_=ox_sc_sfl_title_7&smid=AZCEI3EMXUPTH

keeping your case's ambient temperature down by adding extra intake & outtake fans can help dramatically. the air being pulled onto your CPU & GPU will be cooler making it easier to keep them at lower temperatures and the warmer air produced by both will be pulled out & away quicker making the lower ambient temperature easier to maintain.
this can allow for higher overclocks and/or longer lifespan of all components due to the lack of excess heat.
 

This review explains how it can be powered: http://www.tweaktown.com/reviews/5503/nzxt-grid-10-port-fan-hub-review/index.html
 


So it's powered by a molex connector? Is that the same type of connector a hard drive or internal DVD drive will use?
 
keeping your case's ambient temperature down by adding extra intake & outtake fans can help dramatically. the air being pulled onto your CPU & GPU will be cooler making it easier to keep them at lower temperatures and the warmer air produced by both will be pulled out & away quicker making the lower ambient temperature easier to maintain.
this can allow for higher overclocks and/or longer lifespan of all components due to the lack of excess heat.

Yes yes that's all fine and dandy in theory but in practice only 3-4 way SLI/CFX produces enough heat in the case for airflow to make a difference. Real world testing has proven this. Case fans are only good for show under any other circumstances (and assuming normal ambient room temperature).
 
if you are using the system for basic browsing or some light gaming a single outtake fan will suffice. but if doing heavy processing, video editing, or AAA gaming that stresses your CPU and/or GPU you will be better off with an intake with a clear path and a couple outtakes(rear and top are the best placements). real "real world testing" has proven this.