Rechecking with the St. Pancras image …
On my old machine, but with the very same GPU, NVidia driver and Win11 25H2 the VRAM also didn’t go beyond 8 GB anymore (in one case < 5 GB), so far running quite stable.
Comparing the export times with XD2s in PL9.5 plus studio driver 591.74 (?)
with XD3 in PL9.6 plus studio driver 595.79, they are roughly the same.