system fan suqstion

hi. I have a cooler master haf 932 case and an gigabyte ga-z170x gaming7 motherboard.

I have some headers for system fans. which fans would be system fans?
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Computer GuyAsked:
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Michael-BestCommented:
You need to clarify with specific overheating errors / details.
System fans are all fans that cool system components.

System fan's include:
CPU fan  
Graphics card fan
Chipset fan
PSU fan
PC Case fan
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Computer GuyAuthor Commented:
thanks. this is for a case fans
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Michael-BestCommented:
The fan(s) may be clogged with debris?
These fans usually last longer than the PC unless damaged or clogged with debris...
Any fan noise or visible evidence?
Clean fan blades with cotton sticks or replace fan if needed.
If a water cooled fan then the fan's radiator may be clogged with debris?
 

SpeedFan software is helpful with overheating problems.
 http://www.almico.com/speedfan.php
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Computer GuyAuthor Commented:
this is for a brand new install. are case fans typically not connected to a system fan header but just the molex connector off the power supply?
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Michael-BestCommented:
"but just the molex connector off the power supply?"= fans will run at full speed unless contolled by motherboard temp. control.
Each set up can be controlled via your settings or by the default settings
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dbruntonCommented:
>>  Are case fans typically not connected to a system fan header but just the molex connector off the power supply?

Various ways of doing it.   You can go direct to the Molex connector or you can go to the motherboard.  If you go to the motherboard you may have control of the fan depending on how the board implements the connection.  There's two pins, three pins, four pins.  See https://en.wikipedia.org/wiki/Computer_fan_control#Fan_connectors And you also need fans that have the correct connectors.
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nobusCommented:
your board has a CPU fan connecteor - usually near the cpu - only for use with the cpu fan.
it also has 3 system fan headers for system fans  there are different models :
f
usually, the mobo fan connectors are the preferred ones for additional control, as said; but you can choose to connect them directly to the power supply too

read more about all fans here   https://en.wikipedia.org/wiki/Computer_fan
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Michael-BestCommented:
You will not find 2 pin headers on modern motherboards.
The 3 or 4 pin headers on the motherboard, often have a label printed on the board
It is preferred to have fan speed control on all fans, this reduces excess dust entering the case and also reduces running noise and vibration.
Four-pin headers will work with 3-pin fans, but you loose fan speed control.
By maintaining positive pressure within the case (you need to have a higher combined Cubic Feet Per Minute for the intake fans than the exhaust fans) you prevent dust from being sucked into the many holes and spaces in the case.
Be sure to route all cables using the supplied cable management or some zip-ties.

Suggested reading by pcworld.com:
Link:
http://www.pcworld.com/article/2456907/how-to-install-or-replace-a-case-fan.html
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