You are getting mistaken. the PCIe slot on a mobo is 75w the 6Pin PCIe Cable can handle 150w give or take a few (possibly more if someone wants to confirm).
gt_addict is correct, the cables and the connector on the pod themselves are rated at 13A and are run off a external power supply. In sidehacks case, a configurable power source so he can monitor the raw power usage, others use a break out board and a HP common slot power supply, or just a standard PC power supply with decent power ratings. just make sure your using 16 gauge wires.
heres an example of the powersupply/breakout board kit
https://www.419mining.com/shop/power-supply/complete-power-bundle/