This and 'runs' is a very relative term. What exactly works, what doesn't? What do you need? How power efficient or buggy is it? How is the performance? I remember running Linux on an SGI Indy. Not everything worked, as not every Indy was equal (I had six) but also compared to IRIX (especially 5.x series) the performance was dog slow. The Indy had some good hardware (like the soundcard or Indycam) but that wouldn't work (well) on Linux. My Octane 2 didn't have 3D accelerated graphics on Linux. The state of every port isn't equal. Same on OpenBSD. Furthermore, if you run Linux your distribution of choice may not be available or work well.