https://letmegooglethat.com/?q=how+to+limit+TDP+for+gpus

It's called undervolting/underclocking.

You can make a simple script to do this, OP.

The easiest way is to limit FPS in game and that can help with stutters too.

Afterburner. Has a simple slider to limit the power draw (percentages). You adjust, you click apply, done.
https://www.hardware-corner.net/wp-content/uploads/2022/10/msi-afterburner-power-limit-screen.jpg

Cards don't lose as much performance as you would first think by limiting it to 80, 70, even 60%, as the higher a chip clocks, the more power it draws. At its highest clock speeds, it's the least efficient by a mile -- a big chunk of Watts (and extra heat) for a few extra percentages in performance. But as hardware is sold and competing on performance, manufacturers would be stupid to not push for it at factory settings.

https://www.youtube.com/watch?v=0-UxmcEeRiA

https://www.youtube.com/watch?v=U84nKlF20Iw&


Undervolting can be done as well via Afterburner. Here you can keep the performance and only drop power draw and heat (and fan noise). Just watch a guide on that.

https://www.igorslab.de/en/cooler-breaker-station-fusion-reactor-when-the-geforce-rtx-3090-ti-with-300-watt-choke-sets-the-efficiency-list-on-its-head-and-beats-the-radeons/

probably doable with 4090 and 5090
and still beats what AMD has to offer

Yes, set a power limit in a program like msi afterburner. It limits max gpu power, while still allowing the gpu to boost clocks. Gpu’s can usually run at full power with slightly reduced power limit.

cool thanks everyone