I had a 2080, 3080Ti and now a 4090 and i don't think i've played 10 RTX games since then lol. Until now, the performance hit was too big to be worth it, DLSS 3 is interesting but it needs to be supported, which it won't be if the dev is closer to AMD. The prices have sadly gone crazy, even more than in the mining craze, for EU people the EUR/USD doesn't help either.
Anyway, Nyx will probably benefit a lot from it, the jump from 3090 to 4090 is around 60%, maybe more in rendering and she can save 80-100W for no performance loss by running 2700mhz @ 0.95v and a little memory overclock +500, would be faster, cooler and more effective if power bill is a concern