Is there a simple, off-the-shelf, way to do this? I am guessing I need enough RAM to run a virtual OSX. What virtualization software would best accommodate this? I don't need a supercomputer... but making use of idle clock time on older machine seems like potentially a good value... by extending the useful life of old machines. I am particularly interested in finding out if two entry level i3s (8 cores at 3.6Ghz) could out perform a mid-spec i7 (6 cores).