I think there's some confusion about what's going on here.

A GPU is general purpose, for inference sake. You can run any model that can fit in it. It will be obsolete, as all hardware eventually is, but a 3090 today is more useful than a 3090 two years ago, because small models have improved significantly.

Hardware as a model can run exactly one model, ever. You can't try a fine tune, and can't try the new similarly sized model that's better than all then others you've ever tried. You can run exactly one set of weights, with the architecture it shipped with, because everything is fixed.