Hows X4 doesn't support Nvidia cards? Does it only run on AMD GPUs?
Because FSR runs on both AMD & Nvidia GPUs.
To both.
The game due to the engine runs 40% faster on Nvidia GPUs comparable to equivalent AMD GPUs. Irrelevant if is on Linux or Windows. Is the game engine.
Almost ALL AMD GPU owners playing X4 find ironic from Nvidia users crying about DLSS, Ray Tracing, FSR. Have you seen any AMD owners here writing "non-support of AMD cards, I will quit the game"? Nope and we do have serious perf issue which is unresolved not some nice to have functionality.
And do not forget. When Egosoft implemented in the 4.10 beta FSR even GTX900 owners were celebrating in here as it gave life to their ancient GPUs, let alone GTX1000 users. (my laptop has GTX1060 6GB desktop 5700XT so I count on both groups).
DLSS doesn't run on anything but RTX2000/3000 series, limiting the investment/benefit to a very narrow subset of users while FSR runs on all NV GPUs at least from GTX900 onwards (many run FSR on GTX700s) and AMD 400 onwards including the Ryzen APUs (on Linux at least R9 290/390 too).
That is a very wide user base.