The main cable will have ~280w passing thru it! if quality of the cable, or the pins, or the pins enclosure is bad, than you will have problems!
If they get too hot, then i would think of getting 12v from molex and 8pin cpu! check the pics beneath
http://g01.a.alicdn.com/kf/HTB14tSuJXXXXXXvXFXXq6xXFXXXq/20CM-CPU-8Pin-to-Dual-8-6-2-Pin-PCI-E-PCI-Express-Y-Splitter-Graphics.jpg
https://www.hardwarewebwinkel.nl/pi/delock-power-cable-2-x-4-pins-molex-6-pins-pci-express-82315-/large/kabels_intern_molex_pci-e_t-82315.jpg
Thanks everyone. I got it all working fine. Found some youtube videos to make sure the cable were connected right. As far as the cables being hot. I just checked. They are warm, but not hot. I spread the miner from the PSU because I thought the warmth could just be coming from the miner. The hashing rate is good so I think it's all good. Thanks again!
Good luck with that S5. The best solution for the heat and noise i found was to use a big box fan and have air block through the fins by putting the miner sideway. This would also cool the wires so 2 bird one stone.