Use fan splitter for 2 cpu fans. Fan splitter is ok for 2-3 fans (depends on fan power requirements).have 1 cpu fan /4 pin and 1 sys fan /4 pin
and i have 4x fan in case and 2x fan for cpu cooler
USB gives 5VDC, case fans are mostly 12vDC.Can i use F-USB port on board for run front case fan ?
my board GB 880gm-usb3What is F-USB port ?
Can you show a photo? (upload to imgur.com and post link)
What is model name of your motherboard?
Generally you connect fans to a fan header on motherboard. If there are no free fan headers available, then you can use a fan hub or connect fan to molex connector from PSU via adapter.
Fan header
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Fan Hub
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Molex fan adapter
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Use fan splitter for 2 cpu fans. Fan splitter is ok for 2-3 fans (depends on fan power requirements).have 1 cpu fan /4 pin and 1 sys fan /4 pin
and i have 4x fan in case and 2x fan for cpu cooler