PC internal and external input devices. With hardware, an expansion is a term that describes adding additional hardware to your computer.

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12.  PCI EXPRESS (PCIe)
● The PCIe is an improved version of PCI that took over
both the older version and AGP. It is pretty much the de
facto standard now, and there a few “versions” of it:
• 1X PCIe
• 4X PCIe
• 8X PCIe
• 16X PCIe
• 32X PCIe

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18. ● There is absolutely nothing wrong with external USB devices. They are great, convenient, and
still evolving. But the key importance here is that a 16X PCIe slot can process a lot more data
than a regular USB.
● That makes it perfect for data-heavy components such as a graphics card, or a video capture
card… These are also the devices that you probably won’t ever detach, and keep fixed inside
the computer case.

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22. ● https://red-dot-geek.com/types-of-computer-expansion-cards/
● https://www.lifewire.com/expansion-slot-2625870