Defective RTX 2080 Ti Founders Edition
There could be a lot of reasons.
Overheating
Basically the GPU works in BIOS because it doesn't have to do anything and won't output much heat.
As soon as windows loads, even a slight load will lead to overheating and a thermal shutdown.
I've had the exact same behavior as the GPU in your OP because i mounted a waterblock on my 3080 and the GPU die didn't contact the cooler.
Worked fine in BIOS, didn't go to windows.
Remounting the cooler fixed it.
Broken drivers on their test PC
Maybe they have older or incompatible AMD driver on there.
GPU drivers can cause all sorts of issues, really.
Monitor incompatibility between the GPU and the Monitor
Really, this can happen. Just a recent example:
The Youtuber Der8Auer tried to review the 3080Ti. It didn't work, even after hours of troubleshooting.
Turns out it was the specific monitor he had that didn't get a signal from the GPU.
As soon as he swapped the monitor out, it worked.
There are a bunch more reasons why the GPU could behave like that.
Basically, don't buy a known defective GPU. Chances that you'll fix it are slim to none.
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