Hello i have an old gpu and i've been thinking tl get a gtx 1660 super 6gb for studio neo since things aren't going great in my country , is it enough?
You can definitely use Studio Neo with that. You'll have to test the limits yourself to see how big of a scene you can handle. I have 10GB, and there are times when I have too many lights/models and I simply crash when trying to render, especially if I'm doing 4k stuff.
For most things I'm sure 6GB will be more than enough, though.