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Dated: Feb. 07, 2010

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The motherboard represents the logical foundation of the computer. In other words, everything that makes a computer a computer must be attached to the motherboard. From the CPU to storage devices, from RAM to printer ports, the motherboard provides the connections that help them work together.

The motherboard is essential to computer operation in large part because of the two major buses it contains: the system bus and the I/O bus. Together, these buses carry all the information between the different parts of the computer.

A typical ATX motherboard with support for Nvidia’s scalable link interface (SLI) technology.

Note: A typical ATX motherboard with support for Nvidia’s scalable link interface (SLI) technology.

1. Socket 775 processor socket
2. Dual-channel DDR2 memory slots
3. Heat sink over North Bridge
4. 24-pin ATX v2.0 power connector
5. South Bridge chip
6. PCI slot (2)
7. PCI Express x16 slot (2)
8. PCI Express x1 slot
9. CMOS battery
10. Port cluster
11. SATA host adapter (4)
12. Floppy drive controller
13. PATA host adapter (2)
14. 4-pix ATX12 power connector
15. Mounting holes

The System Bus and I/O Bus

The system bus carries four different types of signals throughout the computer:

  • Data
  • Power
  • Control
  • Address

To help you understand this concept, let's take an imaginary trip to Chicago and compare the city to a typical motherboard. If you were on the Willis Tower observation deck overlooking downtown Chicago one evening, you would first notice the endless stream of cars, trucks, and trains carrying people and goods from everywhere to everywhere else along well-defined surface routes (the expressways and tollways, commuter railroads, Amtrak, and airports). You can compare these routes to the data bus portion of the system bus, which carries information between RAM and the CPU. If you've ever listened to the traffic reports on a radio station such as Chicago's WBBM (760 AM), you've heard how traffic slows down when expressway lanes are blocked by construction or stalled traffic. In your computer, wider data buses that enable more "lanes" of data to flow at the same time promote faster system performance.

Now, imagine that you've descended to street level, and you've met with a local utility worker for a tour of underground Chicago. On your tour, you will find an elaborate network of electric and gas lines beneath the street carrying the energy needed to power the city. You can compare these to the power lines in the system bus, which transfer power from the motherboard's connection to the power supply to the integrated circuits (ICs or chips) and expansion boards connected to the motherboard.

Go back to street level, and notice the traffic lights used both on city streets and on the entrance ramps to busy expressways, such as the Eisenhower and the Dan Ryan. Traffic stops and starts in response to the signals. Look at the elevated trains or at the Metra commuter trains and Amtrak intercity trains; they also move as directed by signal lights. These signals, which control the movement of road and rail traffic, can be compared to the control lines in the system bus, which control the transmission and movement of information between devices connected to the motherboard.

Finally, as you look around downtown, take a close look at the men and women toting blue bags around their shoulders or driving electric vans and Jeeps around the city. As these mail carriers deliver parcels and letters, they must verify the correct street and suite addresses for the mail they deliver. They correspond to the address bus, which is used to "pick up" information from the correct memory location among the gigabytes of RAM in computer systems and "deliver" new programs and changes back to the correct memory locations.

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Jaragua's Comment
I realize you are new to cetpumor repair so you must understand that a 30 or 90 day warranty is what you can expect. These are not going to be new motherboards. These are going to be used motherboards either refurbished, or direct pulls. Only HP can and will warranty their products for longer, and only HP will sell new motherboards and typically they will only let them go to authorized HP repair centers . which means they aren't selling them to Authorized HP repair centers, rather they are shipping them there for an Authorized Repair.Moreover, HP doesn't continually make new motherboards for old models. They sell the boards that were not used from when they did sell that model.So, unfortunately, you are going to have to come to terms with the 3rd party guarantees.end of line
22 Tue Jan 2013
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tameka's Comment
computer concepts
19 Wed Sep 2012
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ah, yeah ?

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12 Sat May 2012
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Hello ManagerZect,

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anita pandey's Comment
thanks alot for the info :) and making me understand :):)
29 Thu Mar 2012
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You're Welcome Anita. Visit Often!

jahirhussain's Comment
14 Tue Feb 2012
Admin's Reply:

 you are welcome jahir :)

Ita's Comment
This is interesting i really learned. pls keep it on. God bless
12 Mon Dec 2011
Admin's Reply:

 thank you ita :)

talent's Comment
nice! what about the components in detail?
24 Mon Oct 2011
Admin's Reply:

 Hi Talen

we already provided much information on our site in details in different pages however if you can provide us some specific details then that would be great since its a huge list and requires time to put all of it :)

sara's Comment
good and easy infromation to understand and learn
17 Mon Oct 2011
Admin's Reply:

 Thank you Sara :) hopefully that article provided you some good information.

Channery's Comment
No question this is the place to get this info, thakns y'all.
30 Sat Jul 2011
Admin's Reply:

 thank you channery :)

Victor Meye's Comment
Thanks to your tutorial i was able to get a better understanding of the many functions and components of a motherboard
14 Thu Jul 2011
Admin's Reply:

 thank you victor. i am glad you like the information. 

Olajire Kabiru Olawale's Comment
Thanks for your support
14 Mon Mar 2011
Admin's Reply:

You're welcome...we do what we can.

DANIEL's Comment
12 Sat Mar 2011
Admin's Reply:

Will Do, and you're welcome

Gladys's Comment
salamat po!
14 Fri Jan 2011
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You're Welcome!

MarketingWoman's Comment
Please, give me link to download XRumer 7.0!!! Thanks! Always yours, miss MW
03 Wed Nov 2010
Admin's Reply:

sorry, you'll have to go on your own on this one.

Sandeep yadav's Comment
It is good way to info
20 Wed Oct 2010
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RAHUL's Comment
24 Tue Aug 2010
Admin's Reply:

Soon, we'll write more about it.

Kyewai's Comment
Easy 2 understand and fast 2 learn!!
12 Wed May 2010
Admin's Reply:

Thanks for such kind words. It makes it all worth while.

Would be nice get comments from your friends too.

pawamangi's Comment
Could you explain each componant in detail,
09 Tue Mar 2010
Admin's Reply:

Try this book: Building the Perfect PC

cbrooks's Comment
It would be great to see a page that goes into more detail about the different components on the motherboard
03 Wed Mar 2010
Admin's Reply:

thanks for the feedback, i ll update it soon

Piyush Mishra's Comment
This is the nice tutorial
02 Tue Mar 2010
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