MORE INFO ABOUT COMPUTER HARDWERE.

Motherboard Expansion SlotsThese are slots located on the motherboard, which are used to connect video cards, sound cards etc.They are of different types:
ISA-Industrial Standard ArchitectureISA slots are made by Promise and called I/O Max. It has an additional set of serial ports, an additional parallel port, and another IDE connector al on the same card but they are reasonably old and are not used too much anymore.
PCI-Peripheral Component InterconnectPCI slot can handle 64-bits of data at a time which is twice as much as an ISA which can handle only 32 bits at a time. A 64 bit PCI slot has 64 connections to the motherboard. Each connection is capable of handling 1 bit of data at a time. ISA is an older technology, therefore PCI is way faster than ISA.
SCSI-Small Computer Interface SystemWith an SCSI expansion card, you can connect upto 15 devices and it is the latest technology of its kind. SCSI cards are available with transfer rates from 4MB per secoond, and upto 320MB.
FactsThe ultra 320 SCSI-2 interface is the fastest with a 320MB per second data transfer rate.
AGP-Accelerated Graphics PortThese slots are dedicated to video cards. They are also called Graphic Expansion Cards. AGP video cards can transfer data faster than PCI video cards. Video cards simply plug into an AGP slot which connects in to a monitor or another video display device in a computer. The DVI(digital video interface) connector connects to a digital video display. Video cards with a TV input connection are able of displaying a television's video on a computer. The quality of the AGP card and resonlution of the monitor determine the picture quality. AGP slots and cards come in 4 different modes and one must be careful to match the right card with the right slot. However some cards can run in more than one modes. AGP x 1 is the oldest mode. It transfers data at about 266MBs persecond. AGP x 2 at 533MBs and AGPx4 at 1.07GBs per second. The latest is AGP x 8 that transfers speed at 2.14 GB s per second!
PCI ExpressThis is a more recent tecnnology this is replacing AGP. PCI Express x 16 slots can transfer data at 4GBs per second, which twice that of an AGP x 8. PCI slots come in PCI2 x 2 , x4, x 8 and x 16.
GPU-Graphic Processing UnitThe vudei card is incharge of controlling the video display. It is the brain of the video card just like the motherboard is the brain of the computer.It is responsible for making the decisions for processing the video card's graphical input and output data. It is hidden under a fan so it doesnt overheat.
Case FanThese are quiet cheap but extremely important. Computer components can produce alot of heat and must be kept cool inorder for them to function properly. Its the main source of cooling for most computers, however its importance is often overlooked. It increases the life of a computer and pervents the parts from wearing out. Most computers are designed to accomodate more than one fans incase users need optional fans.