Air flow. Its easier for the fan to shoot out exhaust with the added preasure caused by all other holes closed, otherwise drafts and lower preasure could make the fan just blow dust around the inside of the computer case.
You plug bits of circuit board into slots to gain extra functionality.
PCI X stands for Peripheral Component Interconnect Extended. It is used for expansion of 32 bit PCI bus slots. The slots are used to enhance the capabilities of the motherboard.
There are several features that can be used to gauge the best computer for a given purpose, but one common consideration should be the room provided for expansion. Expansion slots inside of the computer allow for new components to be installed that will extend the usable lifespan of the system as technology advances. New graphics cards, hard drives, and disc drives can all be added as needed. External expansion slots can be important as well, such as a healthy number of USB ports and potentially a serial or parallel port.
Expansion features, of course (that is why they are called expansion slots).Boards (sometimes called daughterboards) are plugged into these slots to add the needed hardware for features not originally included in the computer. Additional driver software is usually required to support these boards (some OSs can automatically identify the new boards and load the driver software automatically, others require that the user do this manually).
You plug bits of circuit board into slots to gain extra functionality.
PCI AGP PCI-E
Historically laptops used PCMCIA expansion slots, but these days this has generally been depreciated in favour of USB peripherals.
PCI - Peripheral Component Interconnect Also newer PCI express x16 These are the expansion slots on newer motherboards introduced after AGP was phased out. Commonly used to support the computers GPU (Graphical processing unit) or the Video Card
Computers include expansion slots that allow users to add new devices to their computers. A computer player, for example, may upgrade their video card to improve gaming performance. They can use an expansion slot to swap out the old video card with a new one without having to replace the motherboard. What are the advantages of having expansion slots? A computer's expansion slots can be used to install network cards. If the computer does not already have a Wi-Fi adaptor, a Wi-Fi network card can be installed. Furthermore, as newer, faster Wi-Fi standards are announced, expansion card Wi-Fi adapters can be swapped out for newer, faster cards.
The two internal expansion slots in laptops that are commonly used to install wireless adapter cards are the Mini-PCIe and the PCI Express Micro. The Mini-PCIe is for devices that have requirements such as logistics, kiosks, computing, and POS terminals.
NLx
They were known as an "expansion bus". So-called because the expansion cards with edge connectors, plugged directy into the bus board. (Today we would call it a motherboard) There were 3 bus standards: Industry Standard Architecture (ISA) Micro Channel Architecture (MCA) Extended Industry Standard (EISA) I hope that helps. Michael Sharp, CEO hostyouridea.com