My suggestion is using NVIDIA newest graphic card. I am also using RTX 5050. Budget-wise it is okay to go, also by my experience in this 2 months it has another advance restoration quality rather than its older version (i am comparing into another user from another forum quality). I think it has its own plus point where it is using Blackwell Architecture (designed for RTX 50 series card, claims it is faster, smarter etc). Yes, it has very strict limitations. Which is the VRAM. But, you can experiment with the setting as long as you won't restorating 4k JAV video (i think it would be too much for the graphic card). And when you said the older JAV movie, i am suggesting use ISO file which is its original file. Convert it using losslesscut, or shutterencoder, so you could maintain the original quality. Because, the main key is the original files. Not only the graphic card. When you could meets their 2 requirements, i think you find the sweet spots. Everything based on my experience. So, please correct me if i am wrong.