So I think I have the new system pretty much put together and put together correctly - I hope

but I got a PSU plug that I have no idea what to do with. It appears to have come pre-wired to 2 fan control switches on top of the case (DIYPC D480-BK-Window Black Dual USB 3.0 ATX Mid Tower Computer Case with Build-in 5 x White Fans (2 x 120mm Fan x Front, 1 x 120mm Fan x rear, 2 x 120mm Fan x top), Fan Controller) and I have installed the ASUS 970 PRO GAMING/AURA AM3+ AMD 970 + SB 950 SATA 6Gb/s USB 3.1 ATX AMD Motherboard.
Anyway, I have a SeaSonic 620W PSU and there is a plug that looks like an IDE plug:

and on the plug is stamped 'Fan Controller Power'

but I got no idea where it goes, what it does or what to do with it.
So . . . if anybody is familiar with the PSU and can tell me what, if anything, this plug does or goes, I would really appreciate it.
As soon as I find out about this plug and whether its important or not, I will get this fired up (and hopefully it won't actually catch fire) to see if it will really work. Once I find out if I got everything hooked up right and is working, then it will be on to installing drivers and then the wonderful task of installing Win 7 Home Premium (64-bit) and all the updates that go along with it. Then on to downloading AHIII and seeing what all the hoopla is about.
Thanks for any suggestions/comments,
Vance