[insanebits]

You can always have multiple VM's with gpu passthrough, so it's almost like dual boot kind of setup, but you can still run other things on the host. It works pretty well for me, only downside being that you're limited to single VM running at the time.

[icecreammatt]

You can run multiple VM's at the same time as long as you have a separate GPU to assign for each VM. There are videos on Youtube of people demoing this.