await your dwg
for years HSFs were put on silicon, don't see hardness per se as limiting - has very much to do with the mounting procedure and force applied
- but a sharp corner and a tilted mount will cause damage; to the die if made in copper and to the HSF if made in steel
-> as the die is vastly more expensive, I would opt for protecting the die
eventually you will understand that you need a big linear psu
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