Hi Frank,
I assume you are referring to the compute capability 3.0, which should work with CUDA6.0 - CUDA10.1.
If I’m not mistaken, the minimal compute capability for the current binaries is >=3.5, so you could build from source to support this older GPU.
However, if you would like to play around with some legacy PyTorch version, you might get lucky finding some supported binaries here 300 (built by @peterjc123).
Since these binaries are quite old by now, I would recommend building from source.