No, you don't want to use more power. You want more work done. You want the most work done for the least power. Power costs you money; work done increases your FPS. More work done is good, more power is bad.
If you could have a smooth 4k experience with a power-sipping card, or a smooth 4k experience that added £5,000 to your electricity bill each year, you would choose the former.
No, I want the most performance possible that can fit inside a case. The only metric that's important in terms of performance as a ratio is price. Power efficiency is pretty much irrelevant past can I cool and power the card.
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