Support more specific GPU requirements

[chrmarti]

Not sure about other users, the few requirements I often care about (on NVIDIA GPUs) are as follow:

1. Number of GPU units
2. GPU architecture
3. GPU memory
4. GPU compute capability
5. GPU driver version
6. CUDA version (not really a host requirement but is bound by driver version)

i.e. basic info shown by nvidia-smi

Originally posted by @l0rem1psum in #143 (comment)