Here's some useful info on the (metal aluminum cap?) The cap is solid COPPER with nickel plating to keep the copper from oxidizing. On 775 P4's ,and some 478's the inside of the cap is gold plated. Just run a box cutter around the cap to free it from the processor. To remove the cap from the gold plated ones you will have to apply heat to the outside of the cap to melt the solder holding it to the core.
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