iMac Intel 21.5インチ Retina 4K Display 2019 RAMの交換

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The original RAM module closer to the logic board may have a thermal pad adhered to its top side (facing away from the logic board, between the two DIMMs).
If your RAM includes a thermal pad, peel it off and transfer it from the original RAM stick to your replacement RAM before you install it in the lower slot.

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