RP614V4

> Can the RP614v4 Ethernet switch be upgraded to 1 gig speed?

   No.  It's old, and its Ethernet hardware is limited to 100MHz.

   Visit http://netgear.com/support , put in your model number, and look
for Documentation.  Get the "RP614v4 Product Data Sheet", and look at
the specs.  If you want faster Ethernet, then get a newer/faster gizmo.