The GeForce RTX 3090 is the most power-hungry single-GPU card to date. This, however, didn't deter EK from releasing a Quantum Vector water block that promises lower temps and (possibly) higher overclocks.
https://www.notebookcheck.net/The-EK-s-Quantum-Vector-water-block-promises-cool-temps-chart-topping-performance-with-the-GeForce-RTX-3090.516360.0.html