Some astonishing Nvidia GeForce RTX 40 series-related power requirement rumors have surfaced. A well-known leaker has claimed that the flagship Lovelace AD102 GPU, which should appear in an RTX 4090 or 4090 Ti card, has a high-end TGP figure of 850 W. This would mean a 1,500 W and above PSU would be required to eke out full performance levels.
https://www.notebookcheck.net/September-bound-Lovelace-GeForce-RTX-40-series-heats-up-with-alleged-850-W-TGP-for-flagship-AD102-GPU-and-1-500-W-PSU-requirement.603791.0.html