Ok, thank you... Nevertheless, i still have the problem with the performance mentioned in my first post, in this case with continuous stream interruption/picture errors.

@The Vogon How did you disable jumbo packets and ipv6 on these adapters? o_O

@Marky161 I had the same last week, one time so far...updated all adapters(HW V1 EU) to latest official 3.4.2b firmware and they ran several days without drops(but still "performance hickups" in...