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Is this factory defects or ment to be like this?

225 views 4 replies 4 participants last post by  doyll 
#1 ·
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#3 ·
That third pin is for the rpm. Since a fan header can only read 1fan speed at a time, that other third pin is not necessary.
 
#5 ·
That is how a 'Y' splitter is supposed to be. On fan has rpm, ground and power and other only has ground and power. As said above, motherboard header can only read on rpm signal on a header. Feeding two rpm signals can confuse the rpm reading because twice as many pulses as should be are going to header. If pulses are in sync & phase with each other there is no problem, but if they are not the header cannot read them properly.
 
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