My specs- Blender 2.91 intel i5-9400f AMD Radeon RX 570 driver version - 20.11.2 RAM - 16 GB Windows 10 64 bit
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It's probably a problem with the latest AMD driver, switch back to a previous one, or try Properties panel > Render > Performance > High Quality Normals – moonboots Dec 26 '20 at 10:32
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Better thank moonboots... he may be onto something there. Here is a similar question AMD GPU Material in "material preview mode" and "rendered mode", is entirely gray as background. Only outline is displayed which may answer your question. . It has been marked as a dupe of around 20 or more very similar questions in the last week or two. I have voted to close this question on grounds that it too is a duplicate – batFINGER Dec 26 '20 at 10:50

