Expansion Buses

  1. Peripheral Component Interconnect (PCI)
    PCI supports a 32- or 64-bit I/O bus providing      compatibility with both 486 and Pentium machines.      

    • -This bus is processor independent (the CPU and the PCI bus can process concurrently).
    • -PCI is plug-and-play, meaning that newly installed devices can be detected and configured automatically.     
    • -PCI buses are most commonly used for devices such as sound cards, modems, network cards, and storage device controllers.      

    PCI slots are typically white.
  2. Mini-PCI
    Small form factor computers, such as laptops  or micro-ATX systems, might include a mini-PCI slot. Mini-PCI devices are small cards with either 100- or 124-pins. A typical use for a mini-PCI slot is to add internal cards(such as wireless cards) to laptops.
  3. Peripheral Component Interconnect Express      (PCIe)
    • PCI Express (PCIe) is a next generation I/O  bus architecture. Rather than a shared bus, each PCIe slot links to a switch which prioritizes and routes data through a point-to-point dedicated connection and provides a serial full-duplex method of transmission.  
    • -Basic PCIe provides one lane for transmission (x1), at a transfer rate of 2.5 Gbps. It can also provide multiple transmission lanes (x2, x4, x8, x16, x32).
    • -In addition to greatly increased speed, PCIe offers higher quality service.
    • PCIe is backwards compatible and allows legacy PCI technology to be run in the same system (i.e. you can have both PCIe and PCI buses in the same system).     
    • -PCIe buses are most commonly used for video cards in modern computer systems, although nearly any other device can be designed for a PCIe slot.
  4. Accelerated Graphics Port (AGP)
    AGP is similar to PCI, but designed specifically for graphics support. Motherboards that provide      AGP support have a single AGP slot. AGP is commonly used for video cards in modern computer      systems, but is being replaced by PCIe. AGP slots are typically brown.
  5. Audio/Modem Riser (AMR)
    A riser card is not a bus, but rather a card      that attaches to the motherboard and allows      inserting additional cards (called daughter cards). AMR slots typically provide sound or modem functions.
  6. Communications Network Riser (CNR)
    CNR is a riser card slot (not a bus) that      allows for inserting networking, wireless      communication, sound, or modem functions.
Card Set
Expansion Buses
Expansion slots