I'm looking for a tool similar to Top but for your graphics card instead of your CPU.
I've got a Nvidia K1000M Quadro graphics card but I would prefer something that would work for all (or most) cards.
Radeontop, despite it's name will work for any open source graphics driver. If you're using proprietary drivers then you'll need to look into nvidia smi (double check, I think that's what it's called).