Thought of giving it a try myself, after seeing the other NVK Gaming videos by the user Reverse Module in this community. Building Linux 6.7 was kind of a pain though… :V
I happen to have an RTX 3050 Ti Laptop GPU, so I can try things out with and without the GSP firmware. I had tested a game from the 90s (I don’t wanna try out heavier games until the driver is more mature) but still, the performance difference is quite visible.
Edit: I edited the video description to include links to the tests made by the user Reverse Module using an RTX 4090M, I feel dumb about not doing this earlier.
To simply put: Without GSP firmware, Unreal Tournament 99 (using the fan-made Vulkan support) runs with around 30-40 FPS and without any graphical glitches; whereas with GSP firmware I get almost constant 144 FPS but using it also results in complete lockdowns at random intervals: the attempt in the video took 12 seconds after the game launch to freeze the system. I had another one in 4 seconds, and yet another in around 9 minutes or so.