What is a CPU made of? A CPU is a complex integrated circuit made of silicon. A modern CPU can have billions of microscopic transistors mounted on it. The CPU is typically enclosed by a metallic heat spreader which allows for better heat dissipation.
Now that we know what does CPU mean, let's take a look at it. The first image shows the top of a CPU with its heat spreader while the second image shows the bottom where you can see the golden CPU pins:
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