Skurj,
To the best of my recollection, yes the v-sync has been off. This was true of the most recent driver install, 2 wks ago, of the 23.11 drivers.
Of course this is only how the GTU is reporting it and the GTU may be wrong, but try to find a v-sync setting in the later detonator drivers. (going into registry doesn't count)
F.