In my experience, AMD still has some massive stability issues with the VBIOS of their GPUs. But it's not a component that the users can officially update on their own (whichever version the graphic card comes with when you receive it, is what you are stuck with), and most users are not even aware of its existence (even on Windows, the official driver doesn't provide any way to update it, or even check its version). Resulting in two seemingly similar cards, with the same drivers and firmware, behaving wildly differently in some case depending on the production batches the card was part of. Ask me how I know.
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