Here are the results for the XP1600+ at 1.85Vcore at 1400MHZ.
This is the CPU temp from external probe that is touching the side of the core.

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This is the room temp.

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This is what the onboard thermistor reads.

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This is what it lookes like installed from the outside.

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Here is what the bootom of the block looks like with the external probe installed.