Cut the CPU processor in half vertically. What else is inside besides the silicone grease?

In the past few years, as the thermal conductive material of the CPU has changed from brazing to silicone grease, many advanced players are accustomed to opening the CPU cover and replacing the silicone grease to improve heat dissipation performance. This operation can be said to be opening the CPU horizontally, and we can see the complete CPU core, base, top cover, etc., but what if we cut it vertically?

"American Weibo" user TubeTime actually did this once. He cut a CPU (the specific model is unknown) into two halves, just enough to see the vertical section of the CPU. Let's take a look at what's inside.

The CPU that was cut open is BGA packaged. The round ball at the bottom is the BGA solder ball. The upper layer is the PCB substrate, and the middle is the CPU core and thermal conductive material, and the top is the metal protective cover.

He also used a microscope to release a clearer longitudinal cross-section structure, as shown in the figure above.

Since most people do not understand the internal structure of the chip, TubeTime also carefully explained that Solder Balls are solder balls, PC Bord is the PCB substrate, drilled vias are the through holes that connect the solder balls and the Sillicon chip, Thermal compound is the thermal conductive material, the most common of which is silicone grease, soldering is solder, epoxy underfill is epoxy resin filler, and the cooper heat spreader on the top is a copper metal cover that assists in heat dissipation.

To be more specific, the structure of PCB and silicon chip is also quite complicated. There are 10 layers of copper in the PCB, with glass fiber filler in the middle. The solder balls and chips are connected by copper wires and vias, and there are laser micro vias on the top to transmit electrical signals.

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