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You can burn your fingers on a night light, if it has run for about 10 minutes; that is 4, 7 or 11 watts depending on the lamp; a CPU pumps out more than 11 watts and would get quite a bit hotter than the night light.
In laymans terms, connecting the cold heatsink to the hot CPU is what the 'grease' does; without the compound, the connection is really bad; the CPU heat won't get to the heatsink to get cooled by the air. Also, the thermal pads and tapes will tend to squish into the microscopic nooks and crannies of the heatsink; again, these things try to connect the CPU to the heatsink.
The outcome of skipping the grease and/or pads is that you are making the CPU keep all the heat.
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Registered Linux user 260423.
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