This is pop-in test footage of Fallout: New Vegas using the RX 6600. Hopefully I'm not crazy, but this is the card on which I noticed some pop-in issues in that game that don't seem to be as prevalent in the Vega 56 going back to that theory Budget-Builds has about the narrower memory bus on modern cards vs. in his case the R9 Fury series of GPUs as he recently pondered on in his R9 Nano review, and in my case on the RX Vega series of GPUs.

The rest of the system is the same aside from the GPU being swapped out, and yet again, the specs are shown in Mangohud.