Viking 2121 .... I have performed most of what you have suggested ... the GPU is not dead. I said it appears to function correctly after any version of the drivers are loaded. GPU-Z reports all the information correctly. Twice I downloaded the complete Adrenaline software with the driver. The software worked as it should and reported all the info correctly ... and even allowed the GPU to be OC'd. I'm merely wondering if the information I'm getting concerning the state of the install might be erroneous or of no consequence. I am not planning to install the software permanently; only the driver because this will be used for professional photo editing, not gaming.
I thank you for your detailed reply.
A dead GPU can still output a picture is the thing, and GPU-Z and other software can still report and allow for overclocking, but that doesn't mean it's good or stable at doing anything, If you have a driver that does work, stress test it with something like Heaven benchmark, yes its 3d, a game related benchmark, but professional photo editing will also use the 3d clocks and other parts of the GPU just like a game would, if it's not stable to run a game, then it's not going to vary stable running your professional tasks.
For example, I have a few GPUs that do almost the same thing, I have a 6990 where the driver will install, but anything 3d it won't work, go back to Windows XP, 3d applications will run for a period of time but eventually fail with a crash, forget anything more modern than Windows 7 on that card.
I have a GTX 580 as long as you run 2d like desktop, web browser, nothing that ramps the clocks up, its 100% stable, drivers do install just fine, and I can overclock it to the moon, but that moment you run a heavy youtube video, it crashes and won't recover.
GTX 1660, The card is probably the more similar to your issue, where I can get some drivers to install, and even 3d benchmarks can complete sometimes, but something is flaky with the card where most games or anything that pushes it, it crashes, but I can not for life of me get the newest drives to install, I've tried everything, even making windows think its a Quadro and install studio drivers, it's just not stable. Yet everything reports it as fine, it works.
Point is, if it's displaying a picture, and software reports the correct info, and even can get some drivers to sorta install, doesn't;t always mean the card is 100% functioning.
The only thing I can say is you can try is install the card into a different PCI-E slot, and see if it acts the same, if it does, try it on another system, or unplug your OS drive and use a spare drive and reinstall windows and see if the card improves.
Judging by how the card is behaving, I'm still leaning towards the card being dead for the most part, that's a pretty common thing for a failing GPU to do, could be a chip on the card itself dying, a broken solder joint, never know, million different things can make a card act weird.
Good Luck to ya!