EPS power connection on the motherboard for the CPU power, PCIe is the 8-pin for Graphics Card, and some PCI-e devices, power. These two are not the same cable, and will not fit if you try to put one into the wrong one.
EPS-12V 8-pin connection utilizes additional 12V connection, which will allow a single 8-pin to provide 300W. For newer graphics card, such as the A6000, this will be enough to suppliment their maximumTGPmaximumTGP(total graphicspower) of 300W.
You can see that the PCIe 8-pin has one square shaped pin for pins 5-8, whereas EPS-12V has two square shaped pins in the same row. This will prevent inserting the cable into the incorrect slot, most times.
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EPS-12V Y-Adapter
Some graphics card that reqire EPSreqire EPS-12V may come with a Y-adapter that allows two PCIe 8-pin cables to output to a single EPS-12V 8-pin connection that plugs into the graphics card.
Credit to https://www.igorslab.de/ for this image