Inter Vlan route implies a router somewhere. If You already have one router to connect on the switch, then it will do 10Gb wirespeed - after all, it would be only L2 traffic on the switch.
If You want the switch to do the routing, then You need RoS V7 (currently beta) AND one of the switches that can do L3 routing in hardware.
Here we have a list of the switches that (at the moment) can do hardware L3 routing:
https://help.mikrotik.com/docs/display/ ... Offloading