Early 8K benchmarks for the GeForce RTX 3090 Founders Edition have been published, showing the capabilities of NVIDIA's US$1,499 card in games like Control, Death Stranding, Doom Eternal, and Forza Horizon 4. It is not 60 FPS across the board for the RTX 3090, but the card can reach this threshold in some triple-A titles.
https://www.notebookcheck.net/Early-NVIDIA-GeForce-RTX-3090-8K-gaming-benchmarks-show-60-FPS-capabilities-of-upcoming-US-1-499-card.495097.0.html