I used NVIDIA to test the graphics card software "mods",in the default VRAM frequency test,the graphics memory test is normal,When I overclocked the graphics memory by more than 10%, a VRAM bus error occurred during the test.So,i think my VRAM is fine.
But I have found the most likely reson.Due to the low-temperature characteristics of GDDR6X, at low temperatures, The reliability of GDDR6X has decreased.this is a common issue with GDDR6X,this explains why squares always occur when the computer is started.cause temperature of VRAM is lower at this time.When running tests and games after restarting, everything returns to normal as the temperature rises.
so f**k nvidia & micron