You fiddled with PC hardware for decades? Ok. Then why do i get Windows XP vibes from your “swap GPU” story? Been there, done that a long time ago. A memory from a distant past.
Today swapping a GPU is a matter of minutes and not some “extended periods of time”, no matter how you slice it. It also does not matter what brand the new card is. Since Windows 10 hardware swaps are not rocket science or open heart surgery anymore. Power PC off, open it, remove GPU A power, remove the card, insert GPU B, connect power to the card, close and power up the PC, wait for Windows to start up, run Windows Update to install the needed driver and Done!
If you don’t plan to swap your old card back in you can remove the driver of the old card for housekeeping. Windows won’t load that driver anyway while another card is present and just ignores it. Then you can fine tune i.e. update to specific brand driver, set resolution, frame rate, driver settings but that’s all optional.
FYI:
I just did such a swap with a leftover HD 6870 from my brothers PC upgrade. Card swap took like 5 minutes, driver install another 5 and the system was up. Less demanding stuff worked, but D2R refused the cardt due to only 1 GB VRAM which i didn’t knew until canyourunit confirmed it. Nevermind. Swapped cards back (again 5 minutes), booted up and everything was back to normal. No driver reinstall, no redo of settings, nothing. I’d say 15 minutes for a GPU roundtrip is neither an extended period of time or even an ordeal.
err … you claim a serious crash bug other PC players do not see? Wouldn’t such an obvious crash bug be reported like crazy? I don’t see this here, sorry. Going by this forum you are the only PC player with it. Any other crash reports are from PS4 and Nintendo players and any other PC reports are just about lag which is something also not every players sees. On top of that no other player has reported repeated screen flicker like you did. This alone is a clear warning sign of an overburdened video card.
BUT …
since you do not plan to verify your claim although you say you got other/faster cards (x) there is in fact no point in continuing this.
(x): need to have 2 GB VRAM or the game won’t start
Sigh … Really? Putting words in others mouth? At best i said “can’t run D2R properly” which is a “not good” and totally unlike “not”.