I am installing the ThermalTake tough power I Series 1000w irgbPlus. I have all of my cables connected... both my SATA connectors are in and one peripheral connector as well. But I noticed there there is another slot for an additional peripheral connector. The box only came with one, so I was wondering if I can install the extra Sata cable in there? and would it operate as a regular SATA of cable ? Also I would like to know is the usb is mandatory and or necessary, and if so for what reason? My motherboard is ROG Crosshair Hero Viii And from what I see I only have two USB connectors so if it isn’t totally necessary to use this USB from the power supply would be insightful to know. Indeed if I don’t need it, I will have to get an extension hub. Attached or photos of what’s mentioned above.