I bought a working Cherokee 747 from a local place, I will pick up this weekend.
Hopefully with that, I can get this girl back up and running. There is a Hard Drive in the unit as well, so hopefully that works as well, and we can boot into Irix and see what this machine was used for in its past life.
Judging by my unit, cross referencing with this drawing I found on Bukosek's page. My GPU should be a SI/SE + Texture RAM. So that is exciting if that is the case. Having some hardware texture capability would be nice.