Asus pro gaming Z170

Greetings, I just finished my new build and do not have enough fan headers on this mother board.
I have a total of 7 fans, 2 CPU and 5 case fans.
It has 1 main cpu fan header and 1 optional cpu header for fans
It also has 3 case fan headers
and 1 extension fan header which has 5 pins.
I searched and could not find anything useful on how to use that 5 pin ext fan header.
i have 2 installed fans not connected, The Motherboard uses software to control these fans.
Thank in advance as always for your help, MikeJ

Solution: http://www.swiftech.com/8-WayPWMsplitter-sata.aspx

Had the same problem while playing around with some extra fans. I just hooked them up to my PSU using some adaptors and I also used a low noise adaptor to control the fan speed. the better solution would be a fan hub of some sorts that you can connect your fans to, but for me it was more for fun then performance.