PCIe
the connection inside a PC that links the graphics card to the rest of the machine
PCIe, short for PCI Express, is the standard link between a computer's main board and add-in cards such as graphics cards. Its speed limits how fast data moves between the computer's main memory and the graphics card. Newer versions and wider slots are faster; laptops often have narrower, slower links than desktops.
Think of it as
The road between a warehouse and a shop: a wider road moves more goods per hour.
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