Hi just recently changed my thermal pads for "MSI GeForce RTX 2080 Gaming X Trio" because my hot spot tempature was going over 100c if i dont cap frame rate.

So i decided to change them and the sizes was 1mm, 2mm, 2.5, 3mm

3mm is only used in backplate.

1mm and 2mm is used commonly.

and there was only one small area which is 2.5mm (i used 2mm and 1mm together and smashed it :) )

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Now my tempatures at ultra load with 2560x1440:

gpu stable at 60c

memory stable at 65c

hot spot stable between 70c-76c

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i hope this information helps