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When i did my fans you will find that the limit is 3 Fans per fan header, so with that you can run a splitter. Which is 3 into 1 that way you can regulate each back of fans via the BIOS, also there is a Voltage and current limit to each header of 1 amps according to ASUS.
So you need to be careful you don't burn out your Fan headers, the only other way you could do this is to incorporate a MOLEX CONNECTOR to supplement the power to the FANS!!! I am running 10 Fans here of my Mobo, so just be careful and it will work for STH.
Best of luck,
AJ.
P.S. If you need any more help just ask!!