New finding: Starlight in TopazVideo obviously doesn’t do 4x anymore on NVIDIA.
The speed now is the same as with a 2x upscale here - 0.4fps on a RTX 4070 - and also the artifacts with logos/text look exactly the same at 4x vs. 2x - while in TVAI 7.0.2 there are deliberate differences between both with (3x and) 4x handling text/logos much better than 2x but also being MUCH slower (<0.1fps).
With AppleSilicon version the behaviour is more like in TVAI 7.0.2 with 4x upscale being extremely slow but yielding much better text.
So, obviously, in TopazVideo (Studio) Starlight on NVidia chips currently only does the 2x upscale model and anything higher is just upscaled (lanczos or similar).
EDIT: seems this is a bug where Starlight refuses to accept your chosen upscale factor and also shows the wrong intel in the export window regarding the outputs real resolution. By forcing e.g. 4K it does still do higher upscales than 2x.
