I am running a GR3750 and wondering what difference there is between the older Computer Controller SC3000/3500 models and the 'newer' SC7500/7900 models besides ethernet and built in hard drives?

I know the GR3750s print resolution is locked in at 400x400 DPI so will that determine print resolution for the Riso Computer Controller, too? Seems like all I need is the older models (3000/3500) since they don't go higher than the GRs print resolution.

Thanks for the help!