This GPU probably only supports a very old version of CUDA anyway, so it’s unlikely modern deep learning frameworks would run on it.
One option for adding a new GPU to your Mac is to use an eGPU, which is a GPU in an external enclosure that you connect to your Mac over Thunderbolt. https://egpu.io
im running this on a laptop with just a CPU (i5@2.6GHz (4 logical processors) and 16GB RAM.)… it’s taking days to run a 10 epoch fit on lesson 1… so it depends on how patient you are