Types of Motherboard

1. ATX (Advanced Technolgy Extended) :-
The most motherboard designs in use today are based on ATX design. ATX motherboard always have two-raw port cluster on the rear of the motherboard which is cvered with removable plate. When viewed fro near an ATX power supply is at the left and its expansion slots are at the right. A full size ATX motherboard can have as many as 7 expansion slots but most have five or six. ATX flower cases are open from the left hand side.
2. Micro ATX/ Flex ATX :-
These are the reduced size versionof ATX,using the small overall layout but with fewer expansion slots, fewer memory sockets and smaller overall design. Micro ATX motherboard used in low cost system have 3 or 4 slots. Flex ATX motherboards are smaller typically have two one or no slots.
Normally ATX motherboard supports 20 pin ATX power supply where AT motherboard supports 12 pin AT power supply.
3. BTX (Balanced Technology power supply) :-
It is the latest type motherboard, introduced in 2004, BTX tower cases are opened from right hand. BTX system uses in-line air flow, larger fans and thermal module for the processor to provide more effective cooling than ATX. Other differences include a larger connector.
Except these, there are other types motherboards like AT, Baby-AT, LPX, NLX, etc.

• PCI Slot :- Most desktop systems have one or more PCI slots. It is very flexible supporting all types of ad in cards including video desktop systems use 32 bit, 33 mhz virsion of PCI while work station server use 64 bit and 66 Mhz version as well for faster interfacing to high performance drives and network adaptor.
• AGP Slot :- Usually it comes with brown color. It is single slot dedicated to high speed video. Some systems with integrated video offer an AGP port for video upgrades.
• PCI-X slot :- Bassically it comes with some work stations and servers. It is faster versions of PCI slot which also support PCI cards. Gigabytes ethernets cards plug into PCI-X slots.
• AMR/CNR slot :- Some motherboards features one or two riser card standard for connected also supports surround sound as well as modem and network function.