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If I am understanding you right...the fan on the processor is only in a position to keep the processor itself cool. Other units in your case will also need some fresh air, so that is where the external fans come from. Many of the good Video cards also have their own fans, bu again...just for that particular equipment.
I have seven fans all together.
1. CPU
2. Video card
3-4. Intake fans
5-7. Output fans.
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