I own a o2 Box 6341 which does not support Super Vectoring but normal Vectoring. The DSLAM in my neighborhood is capable of doing SV AFAIK. (Telekom provides speeds up to 250 Mbit here)
if the DSLAM is super-vector capable but customer only has a plan serverable with profile 17a, is there any benefit of using a cpe that has support for profile 30a?
update:
bought a fb7520 - tested - no difference in dsl-sync