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(# of) Molex to 8pin pcie

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Ah I think I get what you're saying.
Since the PSU has dual 6pin pcie plugs. I use both.
In the 8pin plugin on the vid, I use the 6pin, and add in the 2 grounds (black) from a molex into the extra 2 spots.

Right?

Exactly. I'd use the grounds from a molex that has nothing else attached to that line, too. That PSU has 4 rails rated for 15 amps each, with a 40 amp combined maximum. I don't know how the rails are laid out in relation to the connectors, and you have a chance of getting an unused rail if you ground from an otherwise unused molex line. Note that grounds on molex are the center 2 wires, so use those whatever the color may be - I think some PSUs have non-standard wire coloring.

Don't be shocked if something melts, though.
 
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