Will my CPU fan perform the same if it shares the same port with one of my case fans

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It's not ideal from the perspective of control of the case ventilation fan, but it is quite all right - as long as the total load on the CPU_FAN header is less than 1 amp. The reality is that there's a reasonable correlation between workloads (and generation of heat) of the CPU chip and the other major heat generators on the mobo.

Important note, though. Any Splitter or Hub device that you use to connect more than one fan to a single mobo header will send back to the mobo the speed signal from only ONE of its fans. Make SURE that the fan speed signal from the real CPU cooling fan is the one that is sent back to the CPU_FAN header. That header usually does extra monitoring of the fan speed to guard against possible failure of CPU cooling.
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kanewolf

kanewolf

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May 29, 2013
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It isn't optimal in most situations. You usually want the speed of the CPU fan controlled by the CPU temp. That means it will ramp up and down more than any other fan. A case fan at the same ramp-up/ramp-down would be less than optimal.
 
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Sir_Lagsalot

Sir_Lagsalot

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Mar 19, 2017
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I would not put the cpu on the same header as a system fan. The cpu fan header is designed to make the fan on it work harder and spin faster depending on the temp of the cpu. If you put it on a system fan header, the cpu could have some thermal issues, since it is telling the motherboard to make to cpu fan spin faster to cool it down, but there is no fan on the cpu header.
 
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Paperdoc

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Oct 19, 2006
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It's not ideal from the perspective of control of the case ventilation fan, but it is quite all right - as long as the total load on the CPU_FAN header is less than 1 amp. The reality is that there's a reasonable correlation between workloads (and generation of heat) of the CPU chip and the other major heat generators on the mobo.

Important note, though. Any Splitter or Hub device that you use to connect more than one fan to a single mobo header will send back to the mobo the speed signal from only ONE of its fans. Make SURE that the fan speed signal from the real CPU cooling fan is the one that is sent back to the CPU_FAN header. That header usually does extra monitoring of the fan speed to guard against possible failure of CPU cooling.
 
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