Well the framerate is the same in Pro no matter the resolution... so the drops happens due CPU.
What beneficies give you dynamic resolution when the GPU is not affecting the performace?
With the frame drops occurring during alpha heavy scenes, it's more likely a bandwidth issue, not a CPU one.
Not native 4k? 1420p? Confused... Can someone explain why DF say output 4k, but native is only 1420p.
Framebuffer is rendered at 1620p and then upscaled to 4K by the engine or system giving you a 4K output.
I wish developers would give an option to disable Temporal AA, at least for games with a dynamic res. Whenever a game has a dynamic res the transition between a lower and higher res makes the game look like it's running at a low res.
TAA shouldn't be used with dynamic res.
There are some great implementations of TAA and can do an amazing job at providing a clean image. Uncharted 4 and LL are two great examples.