Week 4: The evoultion of Expansion slot and PCI

 


Expansion slots have been part of the personal computer for a long time. IBM envisioned the future and came up with the idea of expansion slots, which let the user add new functionality to the machine.

Like everything inside the computer, everything is connected to the external data bus and address bus. The older model would connect the expansion slots through the chipset; however, the newer model is directly connected through the CPU since it can handle it, unlike the old CPU, which wasn’t fast enough. Some modern computers connect to the CPU and chipset to distribute the power among the chipsets.

In the early 1990s, Intel released the PCI (Peripheral Component Interconnect), and PC expansion was never the same. The PCI provided a wider, faster, and more flexible alternative than the previous expansion buses and the lower price to manufacture them transition from older buses to newer PCI. There was even a mini version of PCI for laptops.

Then comes PCI Express (PCIe), which is still PCI, but it has a direct connection to the CPU instead of having to share a bus. Since it was directly connected to the CPU, it could transfer more data than ever. The PCIe uses one wire for sending data and one wire for receiving the data; the wire is called a Lane. In the modern computer, the PCIe is a common expansion slot, the most common being the 16-lane(x16) version used for video cards. 

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