> I just looked at the compatibility list and only the
> x1600 and x1600pro are listed, the xt is not there

The compatibility list is incomplete, so the XT variant is supported, see:

https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=13334&forum=11 (#2)

There are many more variants of several graphics cards missing in the list which are most likely compatible.