I have an RX 7900 XT (specifically, "Gigabyte RX 7900 XT GAMING OC 20G"). I just ran Furmark (version 2.6.0.0) at 2160p and obtained the following scores:
Someone has sneakily posted FurMark GPU benchmark results for the upcoming AMD Radeon RX 9070 XT disguised as an RX 7800 XTX, revealing that the next-gen mid-range GPU will effectively match the performance of the AMD Radeon RX 7900 XTX at 4K resolutions.