Using thermal paste wasn't a good idea and i lost the stock ones.
You will need to contact the manufacturer (Asus, Gigabyte, etc) for that information.
I measured height difference between vRAM and heatspreader of the GPU die. It's about 0.2-0.3mm. Will a 0.5mm thermal pad do?
As mentioned above, you'll need to contact the manufacturer who would have this information.
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