the NVIDIA RTX A6000 uses up to 300 watts of power. It has a single 8-pin CPU power connector and of course it connects via PCI-E. In spite of what was once stated, the PCI-E 4, to the best of my knowledge, still only supplies 75w. With the 8-pin supplying at most another 150w, my math says 225w. Other high powered cards use two 8-pins for this reason I believed. What's going on with the $5k card?
njuffa's comment had the correct answer, but I cannot select a comment as correct.
An 8-pin CPU connector is different than an 8-pin auxiliary power connector.
In their power guide they show how to make an adapter for two 8 pin aux to an 8 pin CPU.