Hello Mike719,
welcome to the Polycom Community.
Both the VVX600 and the VVX601 support Gigabit Ethernet.
The 601, as already explained to the OP, is the new model going forward. It has more memory and a quicker CPU. No more technical detail are available publicly. The VVX600 will be end of sale due lack of parts soon.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services