Question Graphics card power cables?

Mar 29, 2022
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Hello, I'm unsure and have a few questions?
I bought a Thermaltake Toughpower GF1 ARGB 750W power supply, my graphics card is powered by 6 + 4 cables.
This is what the connector side looks like:

And I have 2 cables that split for PCI-E, and they look like this:

I was informed that it is more correct to use 2 cables for graphics, and not to split over one.
My question is:

The one I don't know what it's for, do I need to connect another graphics cable to it?
I'm not sure, because it doesn't say above the connector if it's for that?
 

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