There are a few noticeable differences available between Netgear R6400 and R6700. Netgear R6700 has a powerful 1 GHz dual-core processor where the Netgear R6400 has an 800MHz dual-core processor.R6400 is equipped with USB 2.0 and 3.0 ports but R6700 has only one USB 3.0 port. The Netgear R6700 is a more powerful router than the R6400.