I thought they just got normal 5V and 12V from a regular molex?
I suggest taking a zip tie and neatly gathering up the aux cable and the P4 cable if you arent using it. Then just open the PSU case and put it on the inside instead. Try to put it on the side near the other wires so it isn't obstructing the flow of air through the heatsinks and hot PSU bits, Keeps my wiring neater and I can always use the cable if I need it later.
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