Slightly older news but it seems to check out, in all the excitement over the melting 4090 connectors this one seems to have been missed.
https://www.gizbot.com/computer/new...erformance-25-percent-rtx-30-gpus-083052.html
https://videocardz.com/newz/nvidias...performance-improvements-for-geforce-rtx-gpus
TLDR;
Driver updates and tweaks resizable BAR while making optimizations to shader compilation, resulting in a decent gain in performance for 2000 and 3000 series hardware.
https://www.gizbot.com/computer/new...erformance-25-percent-rtx-30-gpus-083052.html
https://videocardz.com/newz/nvidias...performance-improvements-for-geforce-rtx-gpus
TLDR;
Driver updates and tweaks resizable BAR while making optimizations to shader compilation, resulting in a decent gain in performance for 2000 and 3000 series hardware.