IGMP snooping option on vDS

I was looking at the documentation on the new IGMP snooping feature in version 6 of the distributed switch and it says the limits are 256 groups and 10 sources. Does anyone know what happens when you go over that number? For example, what happens if I have 400 multicast addresses from 400 different sources coming into one vm? (or that many coming into each of 2 or 3 or vms)

Thanks