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Removing the massive logic board requires two hands. With the RAM cavity opened underneath the iMac try to help pushing the logic board with the thumb towards the upper part (towards the isight camera), to ease the release of the logic board.

Notice how far apart the GPU and CPU are, and how they have separate heat sinks leading to opposite sides of the computer. This rather complex thermal engineering work allowed Apple to upgrade the iMac to use Intel's desktop processors.

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