How to connect case fans to PSU?

Barracuda115

Honorable
Oct 3, 2013
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I will get a Raidmax Agusta Titanium witch has 7 fans, a modular Seasonic 750w PSU and the Gigabyte GA-z87-HD3. I know i connect the case fans to the "SYS_FAN" plugs on the mobo but this one only has 3 of them. How do I power case fans with the PSU?