Where I get confused is what is the extra kW doing? It has been at least a decade since I did any intense projects but doesn't 15kW represent the power of an av

Where I get confused is what is the extra kW doing? It has been at least a decade since I did any intense projects but doesn't 15kW represent the power of an average American household circuit. The entire Mac Pro only supports 3 8k displays with built-in hardware. One would need to add SDI cards to add extra displays but the computer only draws 300 Watts. I could get 50 Mac Pros and give up which would give 150 8k displays without expansion. Maybe one gives up the convenience of a single card solution but there maybe other advantages. I'm mostly curious as to what this work load consists of? but when I read the number 8k encode and decode streams 15 kW represents How much of the power is just getting the data in and out of the card to the processor. Apple Silicon doing the same work on die is going to use less power. I don't doubt that there are faster processing units.