Imagine if regular GPUs (the big bois, not pleb garbage) didn't need 8 pin or 6 pin power.
Just succ it all from the slot.
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@FloRolfThe 8P and 6P are not needed at all from what I gather. Instead they are used for other add in cards that aren't contained within Mac Pro Expansion (MPX) modules. MPX modules succ all power from the slot, regular GPUs just use PCIe add-in power.