dealsarctic cooling mx-2 thermal compound -4gram…

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Well, I will be the one: what is this thing & how/why is it used?

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Thermal paste/compound is used to facilitate more efficient heat transfer between a CPU and it's heatsink/fan within a computer. Higher quality thermal paste generally equates to lower CPU temperatures, which can help extend the life of your computer, or is used in overclocking situations.

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Thanks very much for the quick response & explanation. I appreciate the new knowledge! One thing I always appreciate about the WooT communities is the fact that there are people willing to guide 60+ geezers like me.