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Title speaks for itself - is that silver rectangle in the center a heat sink or circuitry?

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It is the case used to house the internal circuitry from being damaged. It is not a heat-sink, as it is unable to dissipate all of the heat generated by the CPU. It does allow smooth contact for a real heat-sink to absorb and dissipate the heat.

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If I have damaged the corners a little bit, it shouldn't have damaged the core, right? –  Arturs Aug 27 '12 at 19:01
    
No way to say for certain, you will just have to test it. –  Keltari Aug 27 '12 at 19:06
    
@Arturs - If the block is damaged then there is no guarantee the internal circuitry isn't damaged as well. –  Ramhound Aug 27 '12 at 19:06

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