The software will run on older machines, mostly you will sit and wait while it catches up, in a home use environment this is just frustrating, in a work / production environment, for an average engineer just looking at drawings and doing a few mods, probably acceptable - for a full time CAD draughtsman, totally unacceptable as each slowdown is a waste of their skill. when we upgraded machines I estimated the new machine would gain us at least 40 minutes a day in achievable work - but only for a CAD expert could tell the difference in speed, just saving a few seconds here - a few seconds there, a casual CAD user could not even notice the speed increase (lack of sitting tapping fingers while waiting on a process to complete).
Grendel