The problem with removing the IHS of the A64's is that whereas they work fine when mounted, the corners start cracking because the pressure of the A64 mounts is greater than the XP system was and it seemed to me that the cores may be more fragile than the smaller XP ones are. Because all of the A64 mounting systems are set up for a very large amount of force as called for by AMD A64 specs, it would be up to the user to figure out how to adapt a custom mounting system to provide less force if the IHS is removed. And from my own testing, I have come to the conclusion that with the right amount of force on the IHS, it can perform as good as removing it in any case.
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